Mechanical work performed by the individual legs during uphill and downhill walking.
Mechanical work performed by the individual legs during uphill and downhill walking.
复制标题
双腿在上坡和下坡行走时的机械功。
DOI：
10.1016/j.jbiomech.2011.10.034
复制
发表时间：
2012-01-10
影响因子：
2.4
通讯作者：
Kram R
中科院分区：
文献类型：
--
作者：
Franz JR;Lyddon NE;Kram R
以前的研究在上坡和下坡行走过程中所做的机械功忽略了双支撑过程中前腿和后腿同时做的负功和正功。我们的目标是量化各个腿在一系列上坡和下坡坡度中所做的机械功。我们假设，在双支撑期间，1）上坡坡度越陡，前腿所做的负功将变得可以忽略不计，而后腿将逐渐做更大的正功以提高质心（CoM），以及2）下坡坡度越陡，前支腿将执行逐渐更大的负功，以降低CoM，而后支腿执行的正功将变为微不足道11名健康青年（6 M/5 F，71.0 ± 12.3kg）在双带测力跑步机上以1.25m/s的速度进行7个等级（0，±3，±6，±9°）的步行。我们收集了三维地面反作用力（GRF），并使用单独的肢体方法来计算每条腿所做的机械功。正如假设的那样，随着上坡坡度的增大，后腿做的正功逐渐增大，随着下坡坡度的增大，前腿做的负功逐渐增大（p<0.005）。令我们惊讶的是，与平地行走不同，在双支撑过程中，当上坡行走时，前腿做了相当大的正功，而当下坡行走时，后腿做了相当大的负功（p<0.005）。为了了解人类如何上坡和下坡，重要的是要考虑这些揭示生物力学方面的个人腿功能和相互作用，在双支撑。
Previous studies of the mechanical work performed during uphill and downhill walking have neglected the simultaneous negative and positive work performed by the leading and trailing legs during double support. Our goal was to quantify the mechanical work performed by the individual legs across a range of uphill and downhill grades. We hypothesized that during double support, 1) with steeper uphill grade, the negative work performed by the leading leg would become negligible and the trailing leg would perform progressively greater positive work to raise the center of mass (CoM), and 2) with steeper downhill grade, the leading leg would perform progressively greater negative work to lower the CoM and the positive work performed by the trailing leg would become negligible. 11 healthy young adults (6M/5F, 71.0 ± 12.3 kg) walked at 1.25 m/s on a dual-belt force-measuring treadmill at seven grades (0, ±3, ±6, ±9°). We collected three-dimensional ground reaction forces (GRFs) and used the individual limbs method to calculate the mechanical work performed by each leg. As hypothesized, the trailing leg performed progressively greater positive work with steeper uphill grade, and the leading leg performed progressively greater negative work with steeper downhill grade (p<0.005). To our surprise, unlike level-ground walking, during double support the leading leg performed considerable positive work when walking uphill and the trailing leg performed considerable negative work when walking downhill (p<0.005). To understand how humans walk uphill and downhill, it is important to consider these revealing biomechanical aspects of individual leg function and interaction during double support.
登录
查看更多内容
影响因子：
--
作者：
CAVAGNA, GA;HEGLUND, NC;TAYLOR, CR
通讯作者：
TAYLOR, CR
影响因子：
2.4
作者：
McIntosh, Andrew Stuart;Beatty, Karen T.;Vickers, Deborah R.
通讯作者：
Vickers, Deborah R.
影响因子：
5.5
作者：
MINETTI, AE;ARDIGO, LP;SAIBENE, F
通讯作者：
SAIBENE, F
影响因子：
2
作者：
ALEXANDER, RM
通讯作者：
ALEXANDER, RM
影响因子：
3.3
作者：
CAVAGNA, GA
通讯作者：
CAVAGNA, GA