Neither total muscle activation nor co-activation explains the youthful walking economy of older runners
Neither total muscle activation nor co-activation explains the youthful walking economy of older runners
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DOI：
10.1016/j.gaitpost.2018.07.169
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发表时间：
2018-09-01
期刊：
影响因子：
2.4
通讯作者：
Ortega, Justus D.
中科院分区：
文献类型：
--
作者：
Beck, Owen N.;Grabowski, Alena M.;Ortega, Justus D.
背景：与年轻人相比，老年人（>= 65岁）在步行时表现出更高的代谢率（更差的步行经济性）。然而，先前的研究表明，习惯性跑步，而不是习惯性步行，可以减轻与年龄相关的步行经济性恶化。研究问题：总的腿部肌肉激活和/或激动剂-拮抗剂共同激活是否解释了老年跑步者比老年步行者更优越的步行经济性？方法：我们量化了老年步行者和老年跑步者在0.75、1.25和1.75 m/s的速度下的代谢能力、腿部肌肉激活和协同激活。结果：考虑到多重比较，老年步行者和老年跑步者在0.75、1.25或1.75 m/s时的总步幅（每次速度p >= 0.024）、站姿（每次速度p >= 0.217）和摇摆（每次速度p >= 0.170）相肌电信号振幅都没有差异。老年跑步者的平均步幅内侧腓肠肌和股二头肌的激活比老年步行者低，分别为1.25和1.75 m/s
Background: Older adults (>= 65 years) exhibit greater metabolic rates during walking (worse walking economy) compared to young adults. Yet, previous research suggests that habitual running, but not habitual walking, exercise mitigates the age-related deterioration of walking economy.Research question: Does total leg muscle activation and/or agonist-antagonist co-activation explain the superior walking economy of older runners versus older walkers?Methods: We quantified metabolic power, leg muscle activation, and co-activation in older walkers and older runners during walking at 0.75, 1.25, and 1.75 m/s.Results: While accounting for multiple comparisons, neither total stride (each speed p >= 0.024), stance- (each speed p >= 0.217), nor swing- (each speed p >= 0.170) phase EMG amplitude differed between older walkers and older runners at 0.75, 1.25, or 1.75 m/s. Stride averaged medial gastrocnemius and biceps femoris activation was lower in older runners than older walkers at 1.25 and 1.75 m/s (all p