PDF(Pubmed)
Abstract：
It is well known that hyperthermia greatly impairs neuromuscular function and dynamic balance. However, whether a greater level of hyperthermia could potentially alter the lower limb simulated muscle activation when crossing an obstacle in female participants remains unknown. Therefore we examined the effect of a systematic increase in oral temperature on lower limb simulated muscle activation when crossing an obstacle in female participants. Eighteen female participants were recruited where they underwent a control trial (Con) and two progressive passive heating trials with Δ 1°C and Δ 2°C increase of oral temperature (Toral) using a 45°C water bath. In each trial, we assessed lower limb simulated muscle activation when crossing an obstacle height of 10%, 20%, and 30% of the participant\'s leg length and toe-off, toe-above-obstacle and heel-strike events were identified and analyzed. In all events, the lower limb simulated muscle activation were greater in Δ2°C than Δ1°C and Con when both leading and trailing limbs crossed the obstacle height of 20% and 30% leg length (all p < 0.001). However, the lower limb simulated muscle activation were not different between Δ1°C and Con across all obstacle heights (p > 0.05). This study concluded that a greater level of hyperthermia resulted in a greater lower limb simulated muscle activation to ensure safety and stability when females cross an obstacle height of 20% leg length or higher.
摘要：
众所周知，热疗会极大地损害神经肌肉功能和动态平衡。然而,女性参与者在穿越障碍物时,更高水平的热疗是否可能改变下肢模拟肌肉的激活,目前尚不清楚.因此，我们研究了女性参与者穿越障碍时，口腔温度系统升高对下肢模拟肌肉激活的影响。招募了18名女性参与者，他们进行了对照试验（Con）和两次渐进式被动加热试验，其中使用45°C水浴将口腔温度（Toral）升高了Δ1°C和Δ2°C。在每次审判中,我们评估了穿越障碍物高度10%时的下肢模拟肌肉激活，20%,和30％的参与者的腿长和脚趾，识别并分析了脚趾上障碍物和脚跟撞击事件。在所有事件中,当前肢和后肢都越过20％和30％腿长的障碍物高度时，下肢模拟的肌肉激活在Δ2°C中大于Δ1°C和Con（均p<0.001）。然而,在所有障碍物高度上，Δ1°C和Con之间的下肢模拟肌肉激活没有差异（p>0.05）。这项研究得出的结论是，更高水平的热疗会导致更大的下肢模拟肌肉激活，以确保女性穿越20％腿长或更高的障碍物高度时的安全性和稳定性。
