在自愿收缩和电刺激收缩期间剩余力增强的日常可靠性。

IF 2.4 4区 医学 Q3 NUTRITION & DIETETICS
Kaitlyn B E Jacob, Avery Hinks, Geoffrey Alonzo Power
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引用次数: 0

摘要

残余力增强(rFE)的特征是在相同肌肉长度和神经肌肉激活水平下,与固定端等距收缩相比,主动肌肉延长后的稳态等距力增加。许多研究已经确定了人类的rFE;然而,rFE的日常可靠性尚不清楚。我们的目的是检查rFE在男性和女性背屈肌各种收缩类型中的日常可靠性。25名从事娱乐活动的年轻人完成了两次访问,间隔一周。在确定最大自主收缩(MVC)强度后,在最大自主力、20% MVC电刺激和20% MVC扭矩匹配条件下评估rFE。每个rFE条件在两次关节偏移中完成:0°-20°足底屈曲(PF)和0°-40°PF,类内相关系数(ICC)评估相对可靠性和典型测量误差(TEM), TEM的相关变异性(CVTEM)评估绝对可靠性。电刺激收缩在40°PF时显示出最高的可靠性(ICC: 0.9;CVTEM: 22.8%)和20°PF (ICC: 0.8;CVTEM: 34.3%),其次是40°PF时最大自主收缩(ICC: 0.7;CVTEM: 55.1%)和20°PF (ICC: 0.1;CVTEM: 81.1%)。扭矩匹配试验显示,20°和40°PF的可靠性较差(ICC: -0.1至0.3;CVTEM: 118.1% - -155.2%)。我们的研究结果表明,与平台区相比,当拉伸到降肢的扭矩-角度关系时,rFE的可靠性更高;在电刺激下,与男性和女性背屈肌的自主收缩相比,rFE的可靠性更高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The day-to-day reliability of residual force enhancement during voluntary and electrically stimulated contractions.

Residual force enhancement (rFE) is characterized by increased steady-state isometric force following active muscle lengthening compared with a fixed-end isometric contraction at the same muscle length and level of neuromuscular activation. Many studies have characterized rFE in humans; however, the day-to-day reliability of rFE is unclear. We aimed to examine day-to-day reliability of rFE across various contraction types in the dorsiflexors in males and females. Twenty-five recreationally active young adults completed two visits, 1 week apart. Following determination of maximum voluntary contraction (MVC) strength, rFE was assessed during maximal voluntary effort, 20% MVC electrically stimulated, and 20% MVC torque-matching conditions. Each rFE condition was completed at two joint excursions: 0°-20° plantar flexion (PF) and 0°-40° PF. Intraclass correlation coefficients (ICC) assessed relative reliability and typical error of measurement (TEM), and the correlation variability of TEM (CVTEM) assessed absolute reliability. Electrically stimulated contractions demonstrated the highest reliability at 40° PF (ICC: 0.9; CVTEM: 22.8%) and 20° PF (ICC: 0.8; CVTEM: 34.3%), followed by maximal voluntary contractions at 40° PF (ICC: 0.7; CVTEM: 55.1%) and 20° PF (ICC: 0.1; CVTEM: 81.1%). The torque-matching trials showed poor reliability for 20° and 40° PF (ICC: -0.1 to 0.3; CVTEM: 118.1%-155.2%). Our results demonstrate higher reliability of rFE when stretching to the descending limb of the torque-angle relationship compared with the plateau region, and in electrically stimulated compared with voluntary contractions in the dorsiflexors for both males and females.

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来源期刊
CiteScore
6.50
自引率
2.90%
发文量
113
审稿时长
4-8 weeks
期刊介绍: Applied Physiology, Nutrition, and Metabolism publishes original research articles, reviews, and commentaries, focussing on the application of physiology, nutrition, and metabolism to the study of human health, physical activity, and fitness. The published research, reviews, and symposia will be of interest to exercise physiologists, physical fitness and exercise rehabilitation specialists, public health and health care professionals, as well as basic and applied physiologists, nutritionists, and biochemists.
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