Modulation of work and power by the human lower-limb joints with increasing steady-state locomotion speed
Modulation of work and power by the human lower-limb joints with increasing steady-state locomotion speed
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DOI：
10.1242/jeb.119156
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发表时间：
2015-08-01
影响因子：
2.8
通讯作者：
Pandy, Marcus G.
中科院分区：
文献类型：
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作者：
Schache, Anthony G.;Brown, Nicholas A. T.;Pandy, Marcus G.
我们研究了人类下肢关节在平地上行走和跑步时是如何调节工作和力量的。实验数据记录了7名参与者在很大范围内的稳态运动速度（步行1.59 +/- 0.09 m s（-1）到短跑8.95 +/- 0.70 m s(-1)）。我们计算了髋关节、膝关节和踝关节的功和平均力量（即随着时间的推移），以及每个关节对下肢产生的总功（髋关节、膝关节和踝关节的总和）和平均力量的相对贡献。无论运动速度如何，踝关节的正功在站立时最大，而髋关节的正功在摇摆时最大。踝关节正功随着运动速度的加快而增加，直到跑步速度达到5.01 +/- 0.11 m s（-1）时，踝关节正功稳定在1.3 jkg（-1）左右。相反，当跑步速度超过5.01 +/- 0.11 m s（-1）时，站立和摇摆时髋关节的正功以及摇摆时膝关节的负功都增加了。当以相同的速度（类似于2.0 m s(-1)）从步行切换到跑步时，脚踝对站立时下肢产生的平均功率（和所做的正功）的贡献从52.7 +/- 10.4%显著增加到65.3 +/- 7.5% (P=0.001)，而髋关节的贡献从23.0 +/- 9.7%显著减少到5.5 +/- 4.6% （P=0.004）。随着跑步速度的加快，髋关节对下肢产生的平均能量（和所做的正功）的贡献在站立期间显著增加(P
We investigated how the human lower-limb joints modulate work and power during walking and running on level ground. Experimental data were recorded from seven participants for a broad range of steady-state locomotion speeds (walking at 1.59 +/- 0.09 m s(-1) to sprinting at 8.95 +/- 0.70 m s(-1)). We calculated hip, knee and ankle work and average power (i.e. over time), along with the relative contribution from each joint towards the total (sum of hip, knee and ankle) amount of work and average power produced by the lower limb. Irrespective of locomotion speed, ankle positive work was greatest during stance, whereas hip positive work was greatest during swing. Ankle positive work increased with faster locomotion until a running speed of 5.01 +/- 0.11 m s(-1), where it plateaued at similar to 1.3 J kg(-1). In contrast, hip positive work during stance and swing, as well as knee negative work during swing, all increased when running speed progressed beyond 5.01 +/- 0.11 m s(-1). When switching from walking to running at the same speed (similar to 2.0 m s(-1)), the ankle's contribution to the average power generated (and positive work done) by the lower limb during stance significantly increased from 52.7 +/- 10.4% to 65.3 +/- 7.5% (P=0.001), whereas the hip's contribution significantly decreased from 23.0 +/- 9.7% to 5.5 +/- 4.6% (P=0.004). With faster running, the hip's contribution to the average power generated (and positive work done) by the lower limb significantly increased during stance (P