Influence of excess weight on lower-extremity vertical stiffness and metabolic cost of walking

IF 2.4 3区医学 Q2 SPORT SCIENCES

European Journal of Sport Science Pub Date : 2020-04-20 DOI:10.1080/17461391.2019.1652350

Victoria G. Bode, R. Croce, T. Quinn, D. LaRoche

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引用次数: 2

Abstract

ABSTRACT The purpose was to test whether lower-extremity vertical stiffness and gait mechanics explain differences in energy cost of walking (Cw) between individuals with normal weight (NW) and obesity (OB). Ten OB (33.1 ± 2.0 kg m−2) and 10 NW (24.2 ± 1.3 kg m−2) walked for six minutes on an instrumented treadmill at 1.25 m s−1 while Cw, lower-extremity kinematics, and vertical stiffness (K vert) were measured. NW completed another trial with a loaded vest (NWL) to simulate the BMI of the obese group. Cw was 24% greater in OB (277.5 ± 45.3 J m−1) and 23% greater in NWL (272.7 ± 35.7 J m−1) than NW (211.0 ± 27.0 J m−1, P < 0.005). Mass-specific Cw (Cwkg) wasn’t different between conditions (P = 0.085). Lower-extremity K vert was 40% higher in OB (32.7 ± 5.2 kN m−1) than NW (23.3 ± 4.7 kN m−1, P < 0.001), but neither was different from NWL (27.5 ± 3.4 kN m−1, P > 0.05). Mass-specific K vert (P = 0.081) was similar across conditions. K vert was related to Cw (r = 0.55, P = 0.001). Cwkg wasn’t different between NW or OB, but there was a negative correlation between BMI and Cwkg driven by lower Cwkg in NWL. Cw and K vert covaried in proportion to body mass, but mass-specific K vert was unrelated to Cwkg. Mass-specific K vert was lower in NWL than OB due to NWL’s greater angle of attack, center of mass displacement, and joint range of motion.

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超重对下肢垂直刚度和步行代谢成本的影响

目的是检验下肢垂直刚度和步态力学是否能解释正常体重(NW)和肥胖(OB)个体行走能量消耗(Cw)的差异。10名OB(33.1±2.0 kg m - 2)和10名NW(24.2±1.3 kg m - 2)在仪器化跑步机上以1.25 m s - 1的速度行走6分钟，同时测量Cw、下肢运动学和垂直刚度(K vert)。NW用负重背心(NWL)完成了另一项试验，以模拟肥胖组的BMI。OB组Cw值(277.5±45.3 J m−1)比NW组(211.0±27.0 J m−1)高24%，NWL组Cw值(272.7±35.7 J m−1)比NW组(211.0±27.0 J m−1)高23%，P < 0.05。不同条件下的质量特异性K vert (P = 0.081)相似。K vert与Cw相关(r = 0.55, P = 0.001)。体重与体重差异无统计学意义，但体重指数与体重呈负相关，主要原因是体重较低。Cw和K vert与体重成比例共变，但质量特异性K vert与Cwkg无关。由于NWL的攻角、质心位移和关节活动范围更大，NWL的质量比K vert比OB低。

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

European Journal of Sport Science 医学-运动科学

CiteScore

6.60

自引率

3.10%

发文量

153

审稿时长

6-12 weeks

期刊介绍： The European Journal of Sport Science (EJSS) is the official Medline- and Thomson Reuters-listed journal of the European College of Sport Science. The editorial policy of the Journal pursues the multi-disciplinary aims of the College: to promote the highest standards of scientific study and scholarship in respect of the following fields: (a) Applied Sport Sciences; (b) Biomechanics and Motor Control; c) Physiology and Nutrition; (d) Psychology, Social Sciences and Humanities and (e) Sports and Exercise Medicine and Health.