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首页> 外文期刊>Gait & posture >Increased muscular challenge in older adults during obstructed gait.
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Increased muscular challenge in older adults during obstructed gait.

机译：步态受阻的老年人肌肉攻击增加。

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Skeletal muscle strength is known to decline with age. Although lower extremity (LE) muscle strength is critical to maintaining dynamic stability, few studies have investigated lower extremity muscle challenge during activities of daily living. The purpose of this study was to investigate the effects of age and obstructed gait on relative lower extremity muscular challenge, with respect to available joint strength. Fifteen healthy young and fifteen healthy older adults were asked to walk over level ground and step over obstacles. Pre-amplified surface electrodes were used to measure bilateral muscular activation of the gluteus medius (GM), vastus lateralis (VL), and gastrocnemius (GA). Muscle activation signals were normalized to peak magnitudes collected during maximal manual muscle testing (MMT). Normalized magnitudes were analyzed during the double-support phase for gluteus medius and vastus lateralis and during the single-support phase for gastrocnemius. A two-factor ANOVA was used to test for age group effect, with repeated measure of obstacle height. In general, older adults demonstrated greater relative activation levels compared to young adults. Gluteus medius activity was significantly greater in the elderly as compared to young during periods of double-support (weight transfer). Increased obstacle height resulted in greater relative activation in all muscles, confirming the increased challenge to the musculo-skeletal system. While healthy elderly adults were able to successfully negotiate obstacles of different heights during walking, their muscular strength capacity was significantly lower than young adults, resulting in relatively higher muscular demands. The resulting potential for muscular fatigue during locomotion may place individuals at higher risk for trips and/or falls.
机译：骨骼肌力量随着年龄的增长而下降。尽管下肢（LE）的肌肉强度对于维持动态稳定性至关重要，但很少有研究调查日常生活活动中下肢肌肉的挑战。这项研究的目的是调查年龄和步态受阻对相对下肢肌肉挑战的影响，以及可用的关节力量。要求15名健康的年轻人和15名健康的成年人在平坦的地面上行走并越过障碍物。预先放大的表面电极用于测量臀中肌（GM），外侧阔肌（VL）和腓肠肌（GA）的双侧肌肉激活。将肌肉激活信号标准化为最大手动肌肉测试（MMT）期间收集的峰值。在臀肌和侧臀的双支撑阶段以及腓肠肌的单支撑阶段分析归一化幅度。两因素方差分析用于测试年龄组效应，并重复测量障碍物高度。通常，老年人比年轻人表现出更高的相对激活水平。在双支撑（体重转移）期间，老年人的臀肌活动能力明显高于年轻人。障碍物高度的增加导致所有肌肉的相对激活增加，从而证实了对肌肉骨骼系统的挑战性增加。健康的老年人能够在行走过程中成功地克服不同高度的障碍，但他们的肌肉力量却明显低于年轻人，从而导致相对较高的肌肉需求。在运动过程中产生的潜在肌肉疲劳可能会使个人旅行和/或跌倒的风险更高。

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