Balbinot G
Federal University of Rio Grande do Norte, Natal, RN, Brazil.
Scand J Med Sci Sports. 2017 May;27(5):482-491. doi: 10.1111/sms.12667. Epub 2016 Feb 21.
Although almost half of all walking bouts in urban environments consist of less than 12 consecutive steps and several day-to-day gait activities contain transient gait responses, in most studies gait analysis is performed at steady-state. This study aimed to analyze external (W ) and internal mechanical work (W ), pendulum-like mechanics, and elastic energy usage during constant and non-constant speeds. The mechanical work, pendular transduction, and energy congruity (an estimate of storage and release of elastic energy) during walking were computed using two force platforms. We found that during accelerating gait (+NCS) energy recovery is maintained, besides extra W , for decelerating gait (-NCS) poor energy recovery was counterbalanced by W and C% predominance. We report an increase in elastic energy usage with speed (4-11%). Both W and %C suggests that elastic energy usage is higher at faster speeds and related to -NCS (≈20% of elastic energy usage). This study was the first to show evidences of elastic energy usage during constant and non-constant speeds.
尽管在城市环境中，几乎一半的步行时段由少于12个连续步骤组成，并且一些日常步态活动包含短暂的步态反应，但在大多数研究中，步态分析是在稳态下进行的。本研究旨在分析恒定速度和非恒定速度下的外部功（W）和内部机械功（W）、类似摆的力学以及弹性能量的使用情况。使用两个测力平台计算步行过程中的机械功、摆动转换和能量一致性（弹性能量存储和释放的估计值）。我们发现，在加速步态（+NCS）期间，除了额外的W之外，能量恢复得以维持；而在减速步态（-NCS）期间，较差的能量恢复被W和C%占优所抵消。我们报告弹性能量使用随速度增加（4-11%）。W和%C均表明，弹性能量使用在较快速度下更高，并且与-NCS相关（约占弹性能量使用的20%）。本研究首次展示了恒定速度和非恒定速度下弹性能量使用的证据。
