Can grip strength be used as a surrogate marker to monitor recovery from shoulder fatigue?

Hawkes, David and Grant, Michael and McMahon, Jessica and Horsley, Ian and Khaiyat, Omid (2018) Can grip strength be used as a surrogate marker to monitor recovery from shoulder fatigue? Journal of Electromyography and Kinesiology, 41. pp. 139-146. ISSN 1050-6411

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Muscular fatigue impacts on normal shoulder function, which is particularly pertinent to throwing athletes. This study aimed to investigate the relationship between grip strength and shoulder muscle fatigue to evaluate the role of grip strength as a surrogate measure for upper limb performance. Twenty healthy participants were recruited. EMG was recorded from 15 shoulder muscles during different fatiguing contractions: an initial baseline recording (Fat-Baseline); after a shoulder exhausting exercise regime (Fat-Exhaustion); and after a 10 minute rest period (Fat-Recovery). Grip strength was similarly measured in the same conditions. Grip strength differed significantly across the testing scenarios (p= 0.012 - <0.001). Greater fatigue was seen in anterior deltoid, middle deltoid, posterior deltoid and supraspinatus in the Fat-Exhaustion contraction as compared to the Fat-Baseline contraction (p=<0.001-0.043). Greater fatigue was seen during the Fat-Recovery contraction for the trapezius, serratus anterior and biceps brachii as compared to the Fat-Exhaustion contraction (p=0.008-0.038). Grip strength decreased following an exhausting exercise protocol but recovered to baseline following a rest period. Conversely, EMG indices of fatigue did not recover. Additional fatigue was seen reflecting a reorganisation of movement strategy. Therefore, susceptibility to injury still exists if grip strength alone is used as a barometer of upper limb performance.

Item Type: Article
Additional Information and Comments: “NOTICE: this is the author’s version of a work that was accepted for publication in the Journal of Electromyography and Kinesiology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in the Journal of Electromyography and Kinesiology, [Vol 41, August 2018]
Keywords: Grip strength; shoulder fatigue; injury prevention; return to play
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Omid Khaiyat
Date Deposited: 10 Jul 2018 15:43
Last Modified: 10 Jul 2018 15:43

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