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Substituting device-measured sedentary time with alternative 24-hour movement behaviours: compositional associations with adiposity and cardiometabolic risk in the ORISCAV-LUX 2 study

Diabetology & Metabolic Syndrome volume 15, Article number: 70 (2023) Cite this article

Abstract

Background

There is a considerable burden of sedentary time in European adults. We aimed to quantify the differences in adiposity and cardiometabolic health associated with theoretically exchanging sedentary time for alternative 24 h movement behaviours.

Methods

This observational cross-sectional study included Luxembourg residents aged 18–79 years who each provided  ≥ 4 valid days of triaxial accelerometry (n = 1046). Covariable adjusted compositional isotemporal substitution models were used to examine if statistically replacing device-measured sedentary time with more time in the sleep period, light physical activity (PA), or moderate-to-vigorous PA (MVPA) was associated with adiposity and cardiometabolic health markers. We further investigated the cardiometabolic properties of replacing sedentary time which was accumulated in prolonged (≥ 30 min) with non-prolonged (< 30 min) bouts.

Results

Replacing sedentary time with MVPA was favourably associated with adiposity, high-density lipoprotein cholesterol, fasting glucose, insulin, and clustered cardiometabolic risk. Substituting sedentary time with light PA was associated with lower total body fat, fasting insulin, and was the only time-exchange to predict lower triglycerides and a lower apolipoprotein B/A1 ratio. Exchanging sedentary time with more time in the sleep period was associated with lower fasting insulin, and with lower adiposity in short sleepers. There was no significant evidence that replacing prolonged with non-prolonged sedentary time was related to outcomes.

Conclusions

Artificial time-use substitutions indicate that replacing sedentary time with MVPA is beneficially associated with the widest range of cardiometabolic risk factors. Light PA confers some additional and unique metabolic benefit. Extending sleep, by substituting sedentary time with more time in the sleep period, may lower obesity risk in short sleepers.

Introduction

High levels of daily sedentary time are prevalent in European adults [1, 2]. New guidelines provided by the World Health Organization (WHO) recommend that sedentary time should be limited, and highlight that replacing sedentary time with physical activity (PA) of any intensity is preferable [3]. This terminology is consistent with the evolution of an integrated movement behaviour paradigm, which acknowledges that daily time is fixed to 24 h and is subject to competing demands. That is, a change of time in one movement behaviour necessitates an equal and opposite time displacement in at least one other behaviour [4]. Compositional and non-compositional isotemporal substitution methods have been developed to accommodate theoretical switching between movement behaviours [5, 6]. They are capable of quantifying, for example, the effects upon health of substituting a fixed amount of sedentary time with alternative movement behaviours. The existing literature indicates that reallocating sedentary time to light PA or moderate-to-vigorous PA (MVPA) appears to be beneficially associated with adiposity and cardiometabolic biomarkers, with the most consistent and favourable associations attributed to MVPA [7,8,9]. However, a relatively limited number of studies have applied the recommended compositional method, which is specifically designed to overcome the challenge of multicollinearity between movement behaviours [10]. There is also a limited body of work in non-clinical and representative population-based samples of adults [8, 9]. This is noteworthy because the importance of PA intensity appears to differ by health status [11]. Furthermore, a number of research priorities were identified by the expert panel which assisted development of the latest WHO guidelines on PA and sedentariness. Additional research was recommended to investigate the benefits of breaking up sedentary time with light PA, and to quantify the cardiometabolic properties of interrupting prolonged sedentary time [12]. Extended periods of uninterrupted sedentariness are prevalent [1, 2] and may be particularly deleterious to cardiometabolic health [13].

The majority of European adults fail to sleep sufficiently [14] which predisposes to multimorbidity [15]. Incorporating device-measured sleep as part of 24 h time-use compositions could therefore yield findings that are highly relevant to public health. It is a weakness that most time-substitution studies have focussed on waking behaviours only, or have resorted to merging device-measured movements with questionnaire-based sleep duration [7, 8]. Time-substitution models rely on precise measurement of each movement behaviour, and self-reported sleep is systematically over-reported [16]. Furthermore, short and long sleep durations are adversely associated with health outcomes in adults [17]. Thus it is conceivable that the impact of replacing sedentary time with sleep may be contingent upon an initial sleep length. Ascertaining this will help to clarify if interventions that target sleep might have differential effects in certain sub-populations (e.g. short versus longer sleepers) and will aid the development of more specific public health recommendations and targeted interventions.

Our objective was to investigate the cross-sectional associations of device-measured 24 h time-use compositions with continuous indices of adiposity and cardiometabolic risk in a sample of Luxembourg adults from the general population. The compositional isotemporal substitution model was used to examine how statistically replacing sedentary time with the sleep period, light PA, and MVPA was associated with outcomes. We further investigated the cardiometabolic properties of artificially substituting longer with shorter bouts of sedentary time.

Methods

Study population

Data were from the ORISCAV-LUX 2 study, a national cross-sectional survey of cardiovascular risk factors in the Luxembourgish general adult population [18]. In total, 1558 participants were enrolled to the study in 2016-18, and detailed information about demographic, economic, lifestyle, medical and health factors were collected. Approximately one-fifth of participants did not consent to wearing an accelerometer (n = 345). Excluding participants with insufficient accelerometer data (n = 76), missing covariable information (n = 38; mainly dietary data and education level were missing), or missing outcome data (n = 53; blood biomarkers were predominantly missing), meant that 1046 participants remained for this complete-case analysis (67.1% of the starting sample). Study approval was granted by the National Research Ethics Committee (N° 201.505/12) and all participants provided written informed consent.

Movement behaviours

An Actigraph GT3X + accelerometer (Florida, USA) was continuously worn on the wrist of the non-dominant hand (except when showering and during water activities) for one week. Data were sampled at a frequency of 30 Hz, and after download via the Actilife software (v6.13.3, Florida, USA) and calibration with the open-source R package GGIR (version 2.2-0), raw acceleration signals were averaged over 5 s epochs [19]. All days with  ≥ 10 h of data were considered useable and a valid wear period comprised  ≥ 4 valid days of accelerometry, including  ≥ 1 weekend day. The total sleep period was calculated as the difference between sleep onset and waking times, detected using a certified method [20]. Validated thresholds were used to estimate the average daily time that participants spent sedentary (≤ 44.8 mg), in light PA (> 44.8 to  ≤ 100.6 mg) and MVPA (> 100.6 mg) [21, 22]. We further calculated the duration of total sedentary time that was accumulated in prolonged (≥ 30 min) and non-prolonged (< 30 min) bout lengths. Full details of the objective monitoring procedure have been provided previously [23].

Adiposity markers

Waist circumference (cm) was measured during mid-expiration with a non-distensible tape placed halfway between the lowest rib and the uppermost lateral border of the iliac crest. Total body fat (%) was assessed using the Tanita BC-418 body composition analyser (Tokyo, Japan). The instrument has been shown to perform well against dual-energy X-ray absorptiometry in healthy individuals [24].

Cardiometabolic health biomarkers

Systolic and diastolic blood pressures (mmHg) were obtained using the automated Omron MX3 Plus blood pressure monitor (Matsusaka, Japan) after participants had been seated quietly for at least 30 min [25]. Venous blood samples were collected after overnight fasting. Biochemical analyses were performed to ascertain concentrations (mg/dL) of blood biomarkers, including fasting plasma glucose, triglycerides, high-density lipoprotein cholesterol (HDL-c), apolipoprotein A1 and B. We calculated the ratio of the two apolipoproteins. Fasting insulin (μIU/mL) was measured using an Abbott immunology analyser (chemiluminescence technique).

Metabolic syndrome and clustered metabolic risk

For description, participants were classified as having metabolic syndrome, defined using standard criteria and suitable waist circumference thresholds (≥ 94 cm in men; ≥ 80 cm in women) [26]. For the main analysis a continuously-distributed clustered metabolic risk score was derived. The score was calculated as the sum of all z-scores for each component of the metabolic syndrome (waist circumference + blood pressure + fasting glucose + triglycerides + inverse HDL-c). Values for HDL-c were inverted because low values are unfavourable. The data for triglycerides were natural log transformed (to normality) prior to calculation and the z-score for blood pressure was taken as the arithmetic mean of systolic and diastolic values. Previous studies have constructed similar clustered risk scores [27,28,29]. Higher scores indicate higher cardiometabolic risk.

Covariables

In response to a questionnaire, participants self-reported their sex (male/female), date of birth (used to calculate age), highest academic qualification (higher education/high school/no diploma), and smoking history (never/former/current smoker). The general health subscale of the short-form 36 health survey was used to indicate self-perceived general health (scores range from 0 to 100 with higher values signifying better health) [30]. Participants reported (yes/no) if they were taking any medications for hypertension, diabetes or dyslipidemia, and if they had a family history of cardiovascular disease or diabetes. A comprehensive food frequency questionnaire was used to assess dietary intake over the preceding three months [31]. We considered total caloric intake (kcal/day), salt (g/day), and caffeine consumption (g/day) as potentially important covariables. Symptoms of depression experienced in the last week were ascertained using the Center for Epidemiologic Studies Depression questionnaire (scores range from 0 to 60 with higher values indicating worse symptomatology) [32]. Sleep quality in the past month was evaluated with the validated and widely-used Pittsburgh sleep quality index (scores range from 0 to 21 with higher values representing poorer sleep quality) [33]. Time-stamped information from accelerometers was used to denote the meteorological season of measurement (summer (starting June 1st)/autumn/winter/spring).

Statistical analysis

Descriptive statistics

Participant characteristics were summarised for the total sample and stratified by metabolic syndrome status. To generate 24 h movement behaviour compositions, the geometric means of each contributing behaviour were rescaled, so that all parts collectively summed to 1440 min. This was performed for two sets of compositions: (1) a four-part composition comprising the sleep period, sedentary time, light PA and MVPA, and (2) a five-part composition in which sedentary time was segregated into prolonged and non-prolonged bouts. Univariate statistics are inadequate to describe the multivariate dispersion of compositional data. Instead, pairwise log-ratios (e.g., ln [sedentary time/MVPA]) were used to convey variation between two respective compositional parts. Values closer to zero indicate higher codependency between two parts of a composition [34].

Time-use associations with adiposity and cardiometabolic risk markers

The compositional isotemporal substitution model was performed in accordance with available guidance [6]. The four- and five-part movement compositions were mapped into real space using isometric log-ratio transformations. Associations between compositions with each of the outcomes (modelled separately) were then assessed using linear regression models adjusted for sex, age, education level, season of measurement, smoking status, general health, medication use, and family history of cardiovascular disease or diabetes. If either of the movement compositions as a whole were significantly associated with outcomes (as determined by Wald tests), compositional isotemporal substitutions were performed to quantify the anticipated differences in outcomes associated with reallocating a fixed amount of sedentary time to one alternative behaviour (one-to-one reallocations), whilst keeping all other movement behaviours constant. The main results are expressed per 30 min time exchanges. Compositional isotemporal substitution models were initially adjusted for each of the aforementioned covariables (model A). In a more elaborate model we further adjusted for what may be perceived as either potential confounding or mediating factors, including dietary components (total caloric intake, salt and caffeine consumption), depressive symptoms, and sleep quality (model B). To examine if associations with biomarkers were independent of adiposity, in a final model, all biomarkers were further adjusted for waist circumference (model C). The data for triglycerides and fasting insulin were natural log transformed (to normality) prior to analyses. To enhance interpretability, their data have been retransformed to represent the percentage difference in outcomes per 30 min of time exchanged.

Time-use associations stratified by sleep period tertiles

For outcomes that exhibited significant associations with sleep period time exchanges, the data were separated by sleep period tertiles, and stratified analyses were performed to investigate heterogeneity of time-use substitutions by sleep length. For this analysis, participants were classified as either short sleepers (n = 349; mean ± sd sleep period: 6.6 ± 0.6 h/night), average sleepers (n = 349; 7.7 ± 0.2 h/night), or longer sleepers (n = 348; 8.8 ± 0.6 h/night). Almost all short sleepers (99.4%) failed to meet the minimum recommended sleep duration of  ≥ 7 h per night [35].

Sensitivity analyses

Three sensitivity analyses were performed to determine the robustness of results. First, because there is uncertainty regarding the health benefits of occupational PA, we excluded participants with manual and physically demanding jobs (n = 75) [36]. We further excluded shift workers (an additional n = 76) as they may have worked overnight and slept in the day. Second, instead of the sleep period (the time elapsed between sleep onset and final waking, inclusive of momentary waking intervals overnight), we included device-measured sleep duration in the four-part time-use composition. This necessitated redistribution of all minutes of overnight wakefulness after sleep onset [median (interquartile range): 50.4 (36.9 to 67.9) min/d) between sedentary time (47.2 (33.9 to 64.1) min/d), light PA (2.3 (1.5 to 3.3) min/d)] and MVPA (0.8 (0.4 to 1.2) min/d). Third, we specified the four-part composition based upon self-reported sleep duration. To enable this, participants reported how many hours and minutes of sleep they had achieved nightly in the past month (mean ± sd: 412.2 ± 65.6 min/d). The questionnaire emphasised that this number may be different from the number of hours spent in bed. It was not possible to recreate the 5-part time-use composition based upon either device or self-reported sleep duration, because we did not possess information about the length of sedentary bouts accrued during waking periods overnight.

Statistical packages

All analyses were performed using R version 4.2.1 (R Development Core Team, Vienna, Austria) using the ‘compositions’ and ‘deltacomp’ packages [37, 38]. The threshold for statistical significance was set at p < 0.05, but we focus our reporting and interpretation of results on 95% confidence intervals, because they indicate the range of plausible values of associations [39].

Results

Participant characteristics

Overall, 6263 valid days of accelerometry were recorded, with nearly all participants (98.1%) contributing four valid weekdays and an entire weekend of data. The median monitoring time was 1440 (interquartile range: 1435 to 1440) min/d. Table 1 provides a description of study participants altogether and stratified by metabolic syndrome status. Table 2 summarises the arithmetic and geometric means of movement behaviour compositions. More than half of each day was engaged in sedentary time and nearly one-third of daily time comprised prolonged sedentariness. Table 3 shows that total and prolonged sedentary time were most codependent with the sleep period. Non-prolonged sedentary time was most codependent with light PA.

Table 1 Participant characteristics overall and stratified by metabolic syndrome status
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Table 2 Arithmetic and geometric compositional means for the four- and five-part time-use compositions
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Table 3 Compositional variation matrices for the four- and five-part time-use compositions
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Time-use associations with adiposity and cardiometabolic risk markers

The four-part composition was significantly associated with adiposity indicators (p < 0.001), blood biomarkers (p ≤ 0.006), and clustered cardiometabolic risk (p < 0.001), but was not associated with systolic (p = 0.16) or diastolic blood pressures (p = 0.44). Table 4 contains the time substitution results for the four-part time-use composition. Replacing sedentary time with MVPA was favourably associated with lower adiposity, fasting glucose, insulin, clustered metabolic risk, and higher HDL-c (model A). Each of the associations were attenuated marginally when further adjusted for dietary components, depressive symptoms and sleep quality (model B), and associations with biomarkers were attenuated by up to half when adjusted for waist circumference (model C). Substituting sedentary time with the sleep period was favourably associated with lower adiposity markers and fasting insulin. Magnitudes of association were approximately half compared to time substitution with MVPA, and the association with fasting insulin weakened when adjusted for waist circumference (model C). Replacing sedentary time with light PA was favourably associated with lower body fat, fasting insulin, and was the only time substitution to exhibit a relationship with lower triglycerides and a lower ratio of ApoB/A1. Table 5 shows some indication that replacing prolonged with non-prolonged sedentary time was weakly associated with lower waist circumference and total body fat, but all confidence intervals narrowly spanned zero and the associations were not statistically significant. There was limited evidence of any associations with biomarkers.

Table 4 Four-part compositional time-use: associations with adiposity and cardiometabolic risk markers per 30 min one-to-one sedentary time exchanges
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Table 5 Five-part compositional time-use: associations with adiposity and cardiometabolic risk markers per 30 min of prolonged sedentary time exchanged with non-prolonged sedentary time
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Time-use associations stratified by sleep period tertiles

Figure 1 illustrates the estimated differences in waist circumference and total body fat with incremental reallocations of sedentary time to other movement behaviours, stratified by sleep period tertiles. In short sleepers, more time in the sleep period at the expense of sedentary time was associated with lower waist circumference (β (95% CI): − 1.39 (− 2.30 to − 0.48) cm per 30 min of time exchanged) and total body fat [− 0.55 (− 1.05 to − 0.04) %]. Shifting sedentary time to light PA was also associated with lower total body fat [− 0.57 (− 1.12 to − 0.03) %] in short sleepers, but not with waist circumference [− 0.41 (− 1.39 to 0.57) cm]. Replacing sedentary time with more MVPA was associated with lower waist circumference in average sleepers [− 1.05 (− 2.10 to − 0.00) cm], and with lower values of both adiposity markers in longer sleepers (waist circumference: − 1.34 (− 2.37 to − 0.31) cm; total body fat: [− 1.07 (− 1.71 to − 0.43) %)]. There were no associations with fasting insulin across any of the sleep period strata (Additional file 1: Table S1).

Fig. 1
figure 1

The estimated differences in waist circumference and total body fat associated with incremental one-to-one reallocations of sedentary time to alternative movement behaviours, stratified by sleep period tertiles. The data are β-coefficients adjusted for model A covariables (sex, age, education level, season of measurement, smoking status, general health, medication use, family history of disease) and represent the expected difference in outcomes when reallocating sedentary time to another behavior, keeping all other movement behaviours constant at the compositional mean. Asterisks indicate statistically significant associations (p < 0.05). Full results, including data further adjusted for model B and C covariables, are presented in Additional file 1: Table S1

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Sensitivity analyses

There was broad overlap of confidence intervals and all patterns of results were essentially unchanged (Additional file 1: Tables S2–S5). Of note, reallocating sedentary time to more self-reported sleep was not statistically significantly associated with waist circumference [β (95% CI) − 0.25 (− 0.61 to 0.11)] cm per 30 min of time exchanged or total body fat [− 0.17 (− 0.37 to 0.04) %], and point estimates were nearly half compared to time-substitutions with device-measured sleep.

Discussion

Summary of findings

We investigated the cross-sectional associations of replacing device-measured sedentary time with alternative 24 h movement behaviours on adiposity levels and cardiometabolic risk markers in a population-based sample of European adults. Compositional isotemporal substitution models revealed that replacing sedentary time with MVPA was beneficially associated with the widest range of outcomes. Substituting sedentary time with light PA conferred some additional and unique cardiometabolic benefit. It was the only time exchange to predict lower triglycerides and a lower ratio of ApoB/A1. Replacing sedentary time with more time in the sleep period was associated with lower fasting insulin, and extending sleep from a short to healthier length (closer to the recommended  ≥ 7 h per night) predicted lower adiposity. There was limited cardiometabolic benefit of interrupting prolonged sedentary time with shorter bouts. Our findings can be used to refine and shape plans for integrated 24 h movement behaviour guidelines, and to inform individualised and tailored interventions as part of precision medicine.

Substitution of sedentary time with MVPA

The four-part compositional model indicated that artificially replacing sedentary time with MVPA was beneficially associated with adiposity, levels of fasting glucose and insulin, HDL-c concentration, and overall clustered cardiometabolic risk. The health benefits of MVPA are well documented, and time-substitution studies often conclude that reallocating time into MVPA from all other behaviours is most favourable [7,8,9]. In line with our results, beneficial time-substitution associations with clustered metabolic risk have been reported previously [27,28,29]. Investigations have also indicated that replacing sedentary time only with MVPA is beneficial for HDL-c [28, 40, 41], and have similarly reported that for each 30 min of time exchanged concentrations are around 1.3 mg/dL higher [28, 40, 42]. Our estimate for fasting plasma glucose is in the middle of currently reported effect sizes [41,42,43,44] and studies have typically reported larger magnitudes of association for fasting insulin [28, 41, 43, 44]. This may be due to a combination of factors, including dissimilar population characteristics, measurement methods, and statistical techniques, although differences between compositional and non-compositional time-substitution approaches are understood to be small when using isometric log-ratio transformations and linear regression [45]. We are one of several recent studies to report that, for each 30 min of sedentary time exchanged with MVPA, waist circumference is lower by approximately 1 cm [27, 28, 42, 43]. Our results exemplify the cardiometabolic importance of abdominal adiposity, as associations with biomarkers were diminished when adjusted for waist circumference. Mendelian randomization analyses have also indicated that the favourable effects of lower sedentary behaviour and higher MVPA on cardiometabolic risk are either mediated or confounded by adiposity [46].

Substitution of sedentary time with light PA

Theoretical replacement of sedentary time with light PA was beneficially associated with total body fat, fasting insulin concentrations, and was the only time exchange to predict lower triglycerides and a lower ratio of ApoB/A1. Experimental data have likewise shown that, irrespective of the intensity of movement, interrupting sedentary time with PA reduces circulating insulin levels [47]. Observational studies have also consistently reported that light PA is associated with insulin and triglyceride concentrations, independently of MVPA [48]. In line with the existing time-substitution literature, we found that exchanging 30 min of sedentary time with light PA predicted 2 to 3% lower fasting insulin and triglycerides [27, 41, 43], but we are the first to report an association with ApoB/A1. Considering the observational nature of our study, it is noteworthy that trial data also provide empirical support to indicate that interrupting sedentariness with light PA improves lipid metabolism (reduced triglycerides and ApoB) and insulin sensitivity, potentially more than energy-matched MVPA [49]. Frequently interrupting sedentary time with light PA is hypothesised to increase lipoprotein lipase activity, hence facilitating lipid oxidation and clearance of free fatty acids [50]. For insulin sensitivity, the total cumulative PA duration is believed to be of utmost importance [51], and light PA has the advantage of being sustainable for long periods and can be used to punctuate sedentary time repeatedly throughout the day. We did not find that replacing sedentary time with light PA was advantageous for waist circumference. This probably explains why substituting sedentary time with light PA was less consistently associated with outcomes compared to MVPA. Total body fat was the only outcome for which time substitutions involving light PA and MVPA were both statistically significant in finally adjusted models. Point estimates indicated that, in order to yield an association with total body fat that was equal to replacing 30 min of sedentary time with MVPA, a 42 min swing to light PA was needed. A previous study reported similar equivalence (replacing sedentary time with 48 min of light PA, or 30 min of MVPA, returned the same association with total body fat [42]). However, a study with arguably superior characterisation of the PA intensity time-series, indicated that a much larger shift to light PA (about 82 min) was necessary to match the adiposity benefit of reallocating 30 min of sedentary time to MVPA [43].

Substitution of sedentary time with the sleep period

Time-substitution associations between sedentary time and sleep with cardiometabolic biomarkers are inconsistent, potentially because most studies have merged device-measured movements with questionnaire-based sleep duration [7, 8]. We found that replacing sedentary time only with device-measured (and not self-reported) sleep was associated with lower adiposity indicators. We further established that replacing sedentary time with more time in the sleep period was associated with lower fasting insulin. A very similar difference (− 2.2% fasting insulin per 30 min of time exchanged) has been reported previously [41], and trials have proven that longer experimentally modified sleep predicts lower insulin [52]. Our stratified analyses by sleep period tertiles, conducted because sleep duration exhibits a nonlinear association with health outcomes [17], revealed that replacing sedentary time with more time in the sleep period was associated with lower adiposity, but only in short sleepers. It has previously been shown that shifting sleep from an inadequate to healthier length predicts attenuated gains in adiposity over time [53], and that for insufficient sleepers, replacing sedentary time with more self-reported sleep predicts lower all-cause mortality risk [54]. Our associations were independent of self-reported total caloric intake, but there may have been residual covariable effects, because short-term trials highlight that sleep extension reduces appetite and desire for unhealthy foodstuffs [55]. We propose that increasing sleep length by redistributing sedentary time may be an appropriate strategy to reduce obesity risk in short‐sleeping individuals.

Substitution of prolonged- with non-prolonged sedentary time

Prolonged sedentary time occupied nearly one-third of daily time. The selected threshold (≥ 30 min) is somewhat arbitrary, but has been used by other studies, which also found some indication that exchanging prolonged with non-prolonged sedentary time was weakly associated with lower adiposity markers [56,57,58]. We found a lack of evidence for associations with biomarkers, which suggests that shorter sedentary bouts alone do not confer substantial cardiometabolic benefit, and that reallocations of sedentary time to alternative movement behaviours may be essential. In support of this assertion, replacing prolonged with non-prolonged sedentary time has been deemed insufficient to reduce the risk of premature mortality [59]. It remains unknown if there is a minimum intensity of PA that is required to confer cardiometabolic benefit. For instance, there are mixed findings about whether replacing sedentary time with standing is advantageous [45, 58]. Standing is performed upright, but often involves minimal movement and an energy expenditure < 1.5 metabolic equivalents, which is beneath the energy cost of light PA and is more consistent with sedentariness [60]. Future studies should use postural allocation algorithms or sensors to capture standing as a discrete component of 24 h time-use. This is vital because standing is often proposed as a strategy to interrupt sedentary time, despite uncertainty regarding its health enhancing credentials.

Implications

Our results support new PA guidelines which acknowledge that replacing sedentary time with any PA intensity (including light) is beneficial for health [3]. We suggest that light PA and MVPA should feature together in public health policies and interventions that are designed to optimise cardiometabolic health. This approach is also pragmatic, since effective interventions to reduce sedentary behaviour show a consistent displacement of sedentary time to light PA, while changes in MVPA are setting-specific and difficult to achieve [61]. Although the magnitudes of some of our associations may appear to be small, the cumulative cardiometabolic effects of replacing sedentary time with alternative behaviours could be influential, as they appear to translate to reduced incidence of cardiovascular disease [62]. For short sleepers, guidelines and interventions should focus on redistributing sedentary time into the sleep period. More than half of the current study population (56.6% based on device-measured sleep duration) slept less than the recommended minimum ≥ 7 h per night [35]. If normalising sleep is causally associated with lower adiposity, it is feasible that extending sleep in habitually short sleepers could assist a downward shift in population adiposity levels.

Strengths and limitations

We have previously observed that ORISCAV-LUX 2 study participants are generally healthier than non-participants [18, 23], but this does not necessarily threaten the validity or generalisability of our associations. Indeed, this investigation benefitted from data collected in a comparatively large population-based sample of adults, who exhibited heterogeneity in exposures and outcomes [63]. It is a strength that accelerometry was used to capture the full breadth of 24 h movement behaviours, including sleep, and unlike studies which have failed to respect the compositional nature of time-use data, the compositional isotemporal substitution model was used [10]. It is a weakness that wrist-worn accelerometers are prone to misclassifying standing as sedentary time, and a posture allocation algorithm was not used to reduce misclassifications [64]. It could also be deemed a limitation that we investigated the sleep period (which includes brief waking intervals overnight) as opposed to sleep duration. Our rationale was that momentary periods of wakefulness whilst lying in bed trying to fall back to sleep are part of a normal sleep–wake cycle, and are not likely an intervention target for reduced sedentary time [65]. Even so, the results based on sleep duration were consistent with those conditional upon the sleep period. Upon excluding manual and shift workers from the analyses, the results remained essentially unchanged, but we caution against extrapolating our findings directly to these subgroups. We have previously shown that manual workers exhibit a distinct movement behaviour profile [2] that is epitomised by less leisure-time PA and considerable occupational PA, about which the health benefits are uncertain [36]. We suggest that more time-substitution research is needed in populations with physically demanding jobs and rotating schedules including night shifts, particularly as they are high-risk groups for metabolic disease [66]. An additional caveat is that our results might not extend to other ethnicities and locations, but they can be considered widely generalisable to white European adults (60.4% of participants were born in Luxembourg, 8.3% in France, 6.3% in Portugal, and 20.2% elsewhere in Europe). As with any observational study, residual confounding or mediating effects by imperfectly measured or unspecified covariables is possible. The results are also cross-sectional and based upon theoretical not actual time reallocations. They require replication in longitudinal and experimental studies.

Conclusion

The most efficient behaviour change scenario appears to be replacing sedentary time with MVPA, as it was beneficially associated with the broadest range of cardiometabolic risk factors. Importantly, substituting sedentary time with light PA appears to confer additional and unique metabolic benefit. It was the only time exchange to predict lower triglycerides and a lower ratio of ApoB/A1. Elongating sleep duration, by substituting sedentary time with more time in the sleep period, could lower obesity risk in short sleepers.

Availability of data and materials

De-identified data supporting the conclusions of this article may be available upon reasonable request, if consent is provided by all authors and the ORISCAV-LUX study group. Requests to access the data should be directed to LM.

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Acknowledgements

We are grateful to all participants of the ORISCAV-LUX 2 study and to the study team and nurses for assisting recruitment and data collection. We gratefully acknowledge the contributions of the wider ORISCAV-LUX study group, including Ala’a Alkerwi, Stephanie Noppe, Charles Delagardelle, Jean Beissel, Anna Chioti, Saverio Stranges, Jean-Claude Schmit, Marie-Lise Lair, Marylène D’Incau, Jessica Pastore, Gwenaëlle Le Coroller, Brice Appenzeller, Sophie Couffignal, Manon Gantenbein, Yvan Devaux, Michel Vaillant, Laetitia Huiart, Dritan Bejko, Torsten Bohn, Hanen Samouda, Magali Perquin, Maria Ruiz, and Isabelle Ernens.

Funding

The ORISCAV-LUX 2 study was funded by the Luxembourg Institute of Health. We have no declaration to make regarding the role of the funding body in the design of the study, the collection, analysis, and interpretation of data, and in writing the manuscript. The views expressed are those of the authors and not necessarily those of the funder.

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Authors and Affiliations

  1. Physical Activity, Sport and Health Research Group, Department of Precision Health, Luxembourg Institute of Health, 1 A-B rue Thomas Edison, L-1445, Strassen, Luxembourg

    Paul J. Collings, Anne Backes & Laurent Malisoux

  2. Deep Digital Phenotyping Research Unit, Department of Precision Health, Luxembourg Institute of Health, L-1445, Strassen, Luxembourg

    Gloria A. Aguayo & Guy Fagherazzi

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  1. Paul J. Collings
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  2. Anne Backes
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  3. Gloria A. Aguayo
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  4. Guy Fagherazzi
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  5. Laurent Malisoux
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Consortia

the ORISCAV-LUX study group

Contributions

PJC designed and conducted the data analysis, wrote the article, and had primary responsibility for the final content of the manuscript. AB processed the accelerometer data and critically revised the manuscript for intellectual content. GA was involved in the data collection, downloaded data from the accelerometers, and critically revised the manuscript for intellectual content. GF helped to interpret study findings and critically revised the manuscript for intellectual content. LM was involved in the data collection, participated in designing the research, helped to interpret study findings, and critically revised the manuscript for intellectual content. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Laurent Malisoux.

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Ethical approval and consent to participate

Approval for the ORISCAV-LUX 2 study was granted by the Luxembourg National Research Ethics Committee (N° 201.505/12) and the National Commission for Private Data Protection (CNPD). Participants were informed about all study details and provided written informed consent.

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Not applicable.

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The authors declare that they have no competing interests.

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Supplementary Information

Additional file 1: Table S1.

Four-part compositional time-use: associations with adiposity indicators per 30 minute one-to-one sedentary time exchanges, stratified by sleep period tertiles. Table S2. Four-part compositional time-use: associations with adiposity and cardiometabolic risk markers per 30 minute one-to-one sedentary time exchanges – results excluding manual and shift workers (n=895). Table S3. Five-part compositional time-use: associations with adiposity and cardiometabolic risk markers per 30 minutes of prolonged sedentary time replaced with non-prolonged sedentary time – results excluding manual and shift workers (n=895). Table S4. Four-part compositional time-use: associations with adiposity and cardiometabolic risk markers per 30 minute one-to-one sedentary time exchanges – results based upon device-measured sleep duration. Table S5. Four-part compositional time-use: associations with adiposity and cardiometabolic risk markers per 30 minute one-to-one sedentary time exchanges – results based upon self-reported sleep duration.

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Collings, P.J., Backes, A., Aguayo, G.A. et al. Substituting device-measured sedentary time with alternative 24-hour movement behaviours: compositional associations with adiposity and cardiometabolic risk in the ORISCAV-LUX 2 study. Diabetol Metab Syndr 15, 70 (2023). https://doi.org/10.1186/s13098-023-01040-x

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Keywords

Diabetology & Metabolic Syndrome

ISSN: 1758-5996

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