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首页> 外文期刊>Gait & posture >Age and walking speed effects on muscle recruitment in gait termination.
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Age and walking speed effects on muscle recruitment in gait termination.

机译：年龄和步行速度对步态终止中肌肉募集的影响。

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During gait termination at normal walking speed, older adults more frequently employ two-step responses, increasing their stopping distance and stopping time more than younger controls. This study investigated ageing effects on lower limb muscle recruitment patterns during stopping at three walking speeds. Twelve young male (26 +/- 3.7 years, range 19-30) and 12 gender-matched older participants (72 +/- 4.3 years, range 65-82) terminated walking at normal, medium and maximum speed. A visual stopping stimulus was presented 10 ms following either left or right heel-contact with no stimulus (catch) on 30% of trials. Electromyographic (EMG) activity was recorded from the tibialis anterior (TA), soleus (SOL), biceps femoris (BF), vastus lateralis (VL) and gluteus medius (GM). Older males more frequently (46% of trials) took two-steps to stop than young males (20%). The stance leg muscles responded significantly faster than the swing leg, and with increased speed, fewer swing limb muscles contributed to stopping. Older males were slower to respond with the stance leg, at 215 ms following the stimulus compared with 176 ms for the younger group. They also recruited fewer swing leg muscles with less frequent activation of the soleus and gluteus medius. Failure to activate muscles would provide less extensor torque to maintain the centre of gravity anterior to the forward base of support. This would decrease the total force opposing horizontal velocity in order to bring the body to rest and, as a consequence, encourage an additional step prior to stopping.
机译：在以正常的步行速度终止步态期间，老年人比两步反应更频繁地采用两步反应，从而增加了他们的停止距离和停止时间。这项研究调查了在以三种步行速度停止时，衰老对下肢肌肉补充模式的影响。十二名年轻男性（26 +/- 3.7岁，范围19-30）和12名性别匹配的老年参与者（72 +/- 4.3岁，范围65-82）终止了以正常，中等和最大速度行走。在30％的试验中，左脚跟或右脚跟接触后10毫秒出现了视觉停止刺激，但没有刺激（捕捉）。从胫骨前（TA），比目鱼（SOL），股二头肌（BF），股外侧肌（VL）和臀肌（GM）记录肌电图（EMG）活性。年龄较大的男性（占试验的46％）比年龄较小的男性（占20％）采取了两步停止治疗。站立的腿部肌肉的反应明显快于摆腿，并且随着速度的增加，更少的摆臂肌肉有助于停止。老年男性对腿部姿势的反应较慢，在刺激后215毫秒，而年轻男性则为176毫秒。他们还招募了较少的摆动腿肌肉，而比目鱼肌和臀小肌的激活频率降低了。未能激活肌肉将提供较少的伸肌扭矩，以将重心保持在支撑物向前的基础之前。这将减小抵抗水平速度的总力，以使身体静止，并因此鼓励在停止之前采取额外的步骤。

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