Move less, spend more: the metabolic demands of short walking bouts.

IF 3.8 1区 生物学 Q1 BIOLOGY
F Luciano, L Ruggiero, A E Minetti, G Pavei
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引用次数: 0

Abstract

The metabolic cost of steady-state walking is well known; however, across legged animals, most walking bouts are too short to reach steady state. Here, we investigate how bout duration affects the metabolic cost of human walking with varying mechanical power, metabolic intensity and duration. Ten participants walked for 10- to 240-s bouts on a stair climber at 0.20, 0.25 and 0.36 m s-1 and on a treadmill at 1.39 m s-1. Oxygen uptake was time-integrated and divided by bout duration to get bout average uptake (V̇O2(b)). Fitting of oxygen uptake kinetics allowed calculating non-metabolic oxygen exchange during phase-I transient and, hence, non-steady-state metabolic cost (C met(b)) and efficiency. For 240-s bouts, such variables were also calculated at steady state. Across all conditions, shorter bouts had higher V̇O2(b) and C met(b), with proportionally greater non-metabolic oxygen exchange. As the bout duration increased, V̇O2(b), C met(b) and efficiency approached steady-state values. Our findings show that the time-averaged oxygen uptake and metabolic cost are greater for shorter than longer bouts: 30-s bouts consume 20-60% more oxygen than steady-state extrapolations. This is partially explained by the proportionally greater non-metabolic oxygen uptake and leads to lower efficiency for shorter bouts. Inferring metabolic cost from steady state substantially underestimates energy expenditure for short bouts.

少动多花:短时间步行的新陈代谢需求。
稳态行走的代谢成本是众所周知的;然而,在有腿动物中,大多数行走的持续时间都太短,无法达到稳态。在此,我们研究了不同机械功率、代谢强度和持续时间下,阵痛持续时间如何影响人类行走的代谢成本。十名参与者分别以 0.20、0.25 和 0.36 米/秒的速度在爬楼梯机上和以 1.39 米/秒的速度在跑步机上行走了 10 至 240 秒。摄氧量经时间积分后除以阵痛持续时间,得出阵痛平均摄氧量(V̇O2(b))。对摄氧量动力学进行拟合,可以计算第一阶段瞬时的非代谢氧交换量,从而计算出非稳态代谢成本(C met(b))和效率。对于 240 秒的阵痛,也计算了稳态时的此类变量。在所有条件下,较短的阵痛具有较高的 V̇O2(b) 和 C met(b),非代谢氧交换也相应较多。随着阵痛持续时间的延长,VĹO2(b)、C met(b)和效率接近稳态值。我们的研究结果表明,较短的阵痛时间比较长的阵痛时间平均摄氧量和代谢成本更高:30 秒的阵痛比稳态外推耗氧量高 20-60%。部分原因是非代谢摄氧量按比例增加,导致较短阵痛的效率较低。根据稳态推断代谢成本大大低估了短阵痛的能量消耗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.90
自引率
4.30%
发文量
502
审稿时长
1 months
期刊介绍: Proceedings B is the Royal Society’s flagship biological research journal, accepting original articles and reviews of outstanding scientific importance and broad general interest. The main criteria for acceptance are that a study is novel, and has general significance to biologists. Articles published cover a wide range of areas within the biological sciences, many have relevance to organisms and the environments in which they live. The scope includes, but is not limited to, ecology, evolution, behavior, health and disease epidemiology, neuroscience and cognition, behavioral genetics, development, biomechanics, paleontology, comparative biology, molecular ecology and evolution, and global change biology.
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