What is the metabolic and energy cost of sitting, standing and sit/stand transitions?
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Modern lifestyles require people to spend prolonged periods of sitting, and public health messages recommend replacing sitting with as much standing as is feasible. The metabolic/energy cost (MEC) of sitting and standing is poorly understood, and MEC associated with a transition from sitting to standing has not been reported. Thus, we carefully quantified the MEC for sitting, standing and sit/stand transitions, adjusting for age and fat-free mass (FFM) in a sample of adults with no known disease.
Participants (N = 50; 25 women), 20–64 years, randomly performed three conditions for 10 min each (sitting, standing, 1 sit/stand transition min−1 and then sitting back down). MEC was measured by indirect calorimetry and FFM by dual-energy X-ray absorptiometry.
V̇O2 (ml kg−1 min−1) for sitting (2.93 ± 0.61; 2.87 ± 0.37 in men and women respectively), standing (3.16 ± 0.63; 3.03 ± 0.40), and steady-state cost of repeated sit/stand transitions (1 min−1) (3.86 ± 0.75; 3.79 ± 0.57) were significantly different regardless of sex and weight (p < 0.001). EE (kcal min−1) also differed from sitting (1.14 ± 0.18; 0.88 ± 0.11), to standing (1.23 ± 0.19; 0.92 ± 0.13), and sit/stand transitions (1 min−1) (1.49 ± 0.25; 1.16 ± 0.16). Heart-rate increased from sitting to standing (~13 bpm; p < 0.001). Neither sex nor FFM influenced the results (p ≥ 0.05).
This study found in a sample of adults with no known disease that continuous standing raised MEC 0.07 kcal min−1 above normal sitting. The transition from sitting to standing (and return to sitting) had a metabolic cost of 0.32 kcal min−1 above sitting. Therefore, public health messages recommending to interrupt sitting frequently should be informed of the modest energetic costs regardless of sex and body composition.
KeywordsSedentary behavior Expenditure Body composition Breaks Heart rate
Analysis of variance
Analysis of covariance
Body mass index
Dual-energy X-ray absorptiometry
Metabolic and energy cost
Resting energy expenditure
Respiratory exchange ratio
We would like to express our gratitude to the participants for their time and effort. There was no financial support in relation to the current project. PBJ is supported by the Portuguese Foundation for Science and Technology (SFRH/BD/81403/2011).
Compliance with ethical standards
Conflict of interest
The authors declare that there are no conflicts of interest.
The study was approved by the Faculty Ethics Council (approval number: 14/2013) and conducted in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards (World Medical Association 2008).
Written informed consent was obtained from each participant prior to entry into the trial.
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