The University of Queensland, Brisbane, Australia.
Med Sci Sports Exerc. 2010 Mar;42(3):546-55. doi: 10.1249/MSS.0b013e3181b64c62.
To compare neuromuscular control ofthe lower limb during gait between individuals with and without a history of exercise-related leg pain (ERLP).
Fourteen females with a history of ERLP and 14 age-, height-, and weight-matched asymptomatic female controls participated in the study.Electromyographic activity, normalized to maximum voluntary contraction (MVC), from 12 lower limb muscles during walking gait was the primary outcome. Secondary outcomes were three-dimensional kinematics of the lower limb during gait, measurements of static foot posture (arch height and midfoot width in weight bearing and non-weight bearing), and foot mobility (difference in arch height and midfoot width from non-weight bearing to weight bearing and foot mobility magnitude).
Individuals with a history of ERLP demonstrated lower peak activation (13.7% MVC, 95% confidence interval (CI) = 3.2%-24.3% MVC) and lower average activation of gluteus medius (2.3% MVC, 95% CI = 0.3%-4.3% MVC) when compared with controls (P G 0.05). This reduction in gluteus medius activation was moderately determined (57.1%, P = 0.01) by the duration (beta = 0.555) and severity of pain (beta = -0.516). Peak and average activation of lateral gastrocnemius were also lower than controls (20.5% MVC, 95% CI = 0.6%-40.5% MVC and 1.7% MVC, 95% CI = 0.2%-3.1% MVC, respectively) but were not explained by pain duration or severity. No differences in kinematics at the ankle, knee, hip and pelvis, or differences in static foot posture and mobility were observed between groups (P > 0.05).
This study provides evidence of altered neuromuscular control of gait in females with a history of ERLP. Further work is required to discern the clinical relevance of this finding.
比较有和无运动相关腿部疼痛（ERLP）病史的个体在步态中下肢的神经肌肉控制。
14 名有 ERLP 病史的女性和 14 名年龄、身高和体重匹配的无症状女性对照者参加了研究。行走步态中 12 个下肢肌肉的肌电图活动，以最大随意收缩（MVC）归一化，是主要结局。次要结局是步态中下肢的三维运动学、静态足姿势（承重和非承重时的足弓高度和中足宽度）和足的可动性（非承重到承重时的足弓高度和中足宽度差异以及足的可动性幅度）。
与对照组相比，有 ERLP 病史的个体的峰值激活（13.7% MVC，95%置信区间（CI）=3.2%-24.3% MVC）和臀中肌的平均激活较低（2.3% MVC，95% CI = 0.3%-4.3% MVC）（P G 0.05）。臀中肌激活的减少由疼痛持续时间（β=0.555）和严重程度（β=-0.516）中度决定（57.1%，P=0.01）。外侧腓肠肌的峰值和平均激活也低于对照组（20.5% MVC，95% CI = 0.6%-40.5% MVC 和 1.7% MVC，95% CI = 0.2%-3.1% MVC，分别），但与疼痛持续时间或严重程度无关。两组之间在踝关节、膝关节、髋关节和骨盆的运动学或静态足姿势和可动性没有差异（P > 0.05）。
本研究提供了有 ERLP 病史的女性步态中神经肌肉控制改变的证据。需要进一步的工作来辨别这一发现的临床意义。
