期刊
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
卷 24, 期 1, 页码 18-24出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jelekin.2013.10.005
关键词
Motor unit; EMG; Muscle; MUNIX; MUSIX
资金
- National Institutes of Health's Eunice Kennedy Shriver National Institute of Child Health and Human Development [R15HD065552]
Introduction: The purpose of this study was to examine the relative and absolute between-day reliability of the motor unit number index (MUNIX). Methods: Young, healthy adults (n = 19) attended two testing sessions separated by 4-weeks where their maximal pinch-grip strength, MUNIX, and motor unit size index (MUSIX) were assessed in the abductor pollicis brevis muscle. Reliability was assessed by intraclass correlation coefficients (ICC), coefficient of variation (CV) and limits of agreement (LOA). Results: No mean differences were observed for MUNIX or MUSIX. The CV for the MUNIX and MUSIX measures were between 13.5% and 17.5%. The ICC for both measures were moderate to moderately-high (0.73-0.76), The LOA for both indicated a homoscedastic relationship. Discussion: Our findings indicate moderate to moderately-high reliability for both MUNIX and MUSIX. Future work is needed to ensure both measures are reliable in other muscles and cohorts, and further investigations are required to examine the validity of MUNIX. (C) 2013 Elsevier Ltd. All rights reserved.
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