UPR 3533, Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), CRNH Auvergne, Clermont Auvergne University, Clermont-Ferrand, France.
International Research Chair Health in Motion, Clermont Auvergne University Foundation, Clermont-Ferrand, France.
J Phys Act Health. 2024 Aug 26;21(10):1054-1063. doi: 10.1123/jpah.2024-0223. Print 2024 Oct 1.
It is essential to better characterize the energetic profile of individuals during very low-intensity physical activity. The objectives of the present study were to determine whether the saver profile from sit-to-stand persists during light physical activity and characterize patterns in substrate utilization from sit-to-stand and during very low-intensity physical activity in healthy men and women.
Sixty-two healthy adults (38 women) performed an experimental sequence that corresponded to 15-minute sitting (SIT1), followed by 15-minute standing (STAND), 15-minute sitting again (SIT2), and finally 15 minutes of light cycling. Continuous indirect calorimetry was allowed to calculate energy expenditure (EE) and respiratory quotient through the entire sequence. Savers and nonsavers (<5% and ≥ 5% increase in EE from sitting to standing, respectively) were determined.
There was an interaction effect in EE between savers and nonsavers through the whole sequence (P = .008). Only nonsavers (71%) exhibited a significant increase in EE from SIT1 to STAND (P < .001). Nonsavers and savers significantly increased EE during 15 minutes of light cycling relative to sitting or standing (P < .001), without any difference between groups. The percentage of change in respiratory quotient from SIT1 to STAND was significantly different between the 2 groups, with increased values in savers and decreased values in nonsavers (P = .03). Significantly lower values in respiratory quotient and EE were found during 15 minutes of light cycling in women compared with men (P < .001).
It is essential to determine individuals' energetic phenotype to determine those who may benefit more from strategies such as standing or light physical activity. The sexual dimorphism in terms of substrate use during such exercise should be considered.
更好地描述个体在极低强度体力活动期间的能量特征至关重要。本研究的目的是确定在轻体力活动期间和从坐到站的过程中，是否仍然存在从坐到站的节约者特征，并描述健康男性和女性从坐到站和极低强度体力活动期间的底物利用模式。
62 名健康成年人（38 名女性）进行了一个实验序列，对应 15 分钟的坐姿（SIT1），然后是 15 分钟的站立（STAND），再次是 15 分钟的坐姿（SIT2），最后是 15 分钟的轻循环。连续间接测热法允许通过整个序列计算能量消耗（EE）和呼吸商。通过能量消耗确定节约者和非节约者（分别为从坐姿到站立时 EE 增加<5%和≥5%）。
在整个序列中，节约者和非节约者之间的 EE 存在交互作用（P=.008）。只有非节约者（71%）从 SIT1 到 STAND 时 EE 显著增加（P<.001）。非节约者和节约者在 15 分钟的轻循环期间，与坐姿或站立时相比，EE 显著增加（P<.001），两组之间没有差异。从 SIT1 到 STAND 的呼吸商变化百分比在两组之间存在显著差异，节约者增加，非节约者减少（P=.03）。与男性相比，女性在 15 分钟的轻循环中，呼吸商和 EE 的值显著降低（P<.001）。
确定个体的能量表型对于确定那些可能从站立或轻体力活动等策略中受益更多的人至关重要。在这种运动中，应考虑性别在底物利用方面的差异。
