Ankle resistance with a unilateral soft exosuit increases plantarflexor effort during pushoff in unimpaired individuals.
Ankle resistance with a unilateral soft exosuit increases plantarflexor effort during pushoff in unimpaired individuals.
复制标题
踝关节阻力与单侧软外装护具增加跖屈肌的努力，在推动未受损的个人。
DOI：
10.1186/s12984-021-00966-5
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发表时间：
2021-12-27
影响因子：
5.1
通讯作者：
Walsh CJ
中科院分区：
文献类型：
--
作者：
Swaminathan K;Park S;Raza F;Porciuncula F;Lee S;Nuckols RW;Awad LN;Walsh CJ
踝关节定向阻力训练可提高步行过程中的跖屈功能，增加康复强度，这是脑卒中后运动恢复的重要因素。然而，了解的影响，抵抗跖屈在立场上的关节动力学和肌肉活动的关键成果，在评估其潜在价值的康复仍然有限。该初步研究使用在未受损个体中在中晚期站立期间抵抗跖屈的单侧外装护具来测试以下假设：当跖屈受到抵抗时，个体将（1）增加跖屈踝关节扭矩和受抵抗的同侧踝关节处的局部肌肉活动，但是（2）在更高的力下，表现出也使用未抵抗的关节和肢体的全身反应。此外，我们预计（3）在消除阻力后立即进入步态的短期保留。10名健康的年轻人以1.25 m s-1的速度行走4次，每次10分钟，每次包括基线、暴露于主动外装服施加的阻力和活动后部分。在每一回合中，基于个体基线踝关节扭矩施加不同的力大小。在低、中、高和最大状态下，机器护甲施加的峰值阻力扭矩分别为0.13 ± 0.01、0.19 ± 0.01、0.26 ± 0.02和0.32 ± 0.02 N m kg−1。(1)在所有的比赛中，与相应的基线相比，参与者在外装应用阻力期间增加了0.13-0.25 N m kg−1（p < 0.001）的同侧生物踝关节扭矩峰值。此外，站立期间同侧比目鱼肌活动增加了5.4-11.3%（p < 0.05），但低回合。(2)在HIGH和MAX发作中，同侧肢体的垂直地面反作用力降低，而对侧肢体的垂直地面反作用力增加（p < 0.01）。二次分析发现，最大化生物踝关节扭矩增加而肢体载荷无显著变化的力大小因受试者而异。(3)最后，同侧跖屈角峰值在中等高阻力回合中暴露后显著增加（p < 0.05），这对应于比目鱼肌活动的最大平均增加（p > 0.10）。在站立期间通过机器护甲的踝跖屈的目标阻力在主动阻力期间一致地增加局部同侧跖屈肌努力，但是力的大小将是调整以最小化在训练期间未抵抗的关节和肢体的参与的重要参数。在线版本包含补充材料，可通过10.1186/s12984-021-00966-5获得。
Ankle-targeting resistance training for improving plantarflexion function during walking increases rehabilitation intensity, an important factor for motor recovery after stroke. However, understanding of the effects of resisting plantarflexion during stance on joint kinetics and muscle activity—key outcomes in evaluating its potential value in rehabilitation—remains limited. This initial study uses a unilateral exosuit that resists plantarflexion during mid-late stance in unimpaired individuals to test the hypotheses that when plantarflexion is resisted, individuals would (1) increase plantarflexor ankle torque and muscle activity locally at the resisted ipsilateral ankle, but (2) at higher forces, exhibit a generalized response that also uses the unresisted joints and limb. Further, we expected (3) short-term retention into gait immediately after removal of resistance. Ten healthy young adults walked at 1.25 m s−1 for four 10-min discrete bouts, each comprising baseline, exposure to active exosuit-applied resistance, and post-active sections. In each bout, a different force magnitude was applied based on individual baseline ankle torques. The peak resistance torque applied by the exosuit was 0.13 ± 0.01, 0.19 ± 0.01, 0.26 ± 0.02, and 0.32 ± 0.02 N m kg−1, in the LOW, MED, HIGH, and MAX bouts, respectively. (1) Across all bouts, participants increased peak ipsilateral biological ankle torque by 0.13–0.25 N m kg−1 (p < 0.001) during exosuit-applied resistance compared to corresponding baselines. Additionally, ipsilateral soleus activity during stance increased by 5.4–11.3% (p < 0.05) in all but the LOW bout. (2) In the HIGH and MAX bouts, vertical ground reaction force decreased on the ipsilateral limb while increasing on the contralateral limb (p < 0.01). Secondary analysis found that the force magnitude that maximized increases in biological ankle torque without significant changes in limb loading varied by subject. (3) Finally, peak ipsilateral plantarflexion angle increased significantly during post-exposure in the intermediate HIGH resistance bout (p < 0.05), which corresponded to the greatest average increase in soleus activity (p > 0.10). Targeted resistance of ankle plantarflexion during stance by an exosuit consistently increased local ipsilateral plantarflexor effort during active resistance, but force magnitude will be an important parameter to tune for minimizing the involvement of the unresisted joints and limb during training. The online version contains supplementary material available at 10.1186/s12984-021-00966-5.
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影响因子：
5.1
作者：
Lee S;Kim J;Baker L;Long A;Karavas N;Menard N;Galiana I;Walsh CJ
通讯作者：
Walsh CJ
paretic推进和尾肢角是中风后长距离步行功能的关键决定因素。
影响因子：
4.2
作者：
Awad LN;Binder-Macleod SA;Pohlig RT;Reisman DS
通讯作者：
Reisman DS
影响因子：
2.6
作者：
Elias, LJ;Bryden, MP;Bulman-Fleming, MB
通讯作者：
Bulman-Fleming, MB
影响因子：
5.1
作者：
Awad, Louis N.;Esquenazi, Alberto;Jayaraman, Arun
通讯作者：
Jayaraman, Arun
影响因子：
2.8
作者：
Bae, Jaehyun;Awad, Louis N.;Walsh, Conor J.
通讯作者：
Walsh, Conor J.