Elastic band exercise induces greater neuromuscular fatigue than phasic isometric contractions. (August 2019)

• Record Type: Journal Article
• Authors: Grosprêtre, Sidney; Gimenez, Philippe; Mourot, Laurent; Coratella, Giuseppe
• Is Part Of: Journal of electromyography and kinesiology. Volume 47(2019)
• Page Start: 113
• Page End: 120
• Publication Date: 2019-08
• Subjects: Triceps surae -- Electromyography -- H-reflex -- M-wave -- V-wave -- Force; EB Elastic Band exercise -- Hmax Maximal H-reflex -- Hpot Maximal H-reflex potentiated (following the MVC) -- Hsup Maximal H-reflex superimposed (evoked during the MVC) -- ISO Isometric exercise -- MatHmax M-wave accompanying Hmax -- MatHpot M-wave accompanying Hpot -- MatHsup M-wave accompanying Hsup -- Mmax Maximal M-wave -- Mpot Maximal M-wave potentiated (following the MVC) -- Msup Maximal M-wave superimposed (evoked during the MVC) -- MVC Maximal Voluntary Contraction -- RMS Root Mean Square of muscle electromyographic activity (EMG); Electromyography -- Periodicals; Kinesiology -- Periodicals; Electromyography -- Periodicals; Movement -- physiology -- Periodicals; Muscles -- physiology -- Periodicals; Électromyographie -- Périodiques; Cinésiologie -- Périodiques; Electromyography; Kinesiology; Electronic journals; Periodicals; 616.740757
• DOI: 10.1016/j.jelekin.2018.12.003
• Languages: English
• ISSNs: 1050-6411

Abstract

Abstract: This study investigated the neuromuscular fatigue following an elastic band exercise (EB) of the plantar flexors, compared to an intermittent phasic isometric exercise (ISO). Eleven young healthy males (age: 24.2 ± 3.7) took part in the study, consisting of one experimental session involving two 5-min fatiguing protocols separated by 20 min rest and performed randomly. Both exercises were performed at maximal motor output of the plantar flexor muscles, EMG being used as a feedback signal. Neuromuscular fatigue was assessed through changes in maximal voluntary contraction (MVC) and in evoked responses of soleus and gastrocnemii muscles to posterior tibial nerve stimulation (H-reflex, M-wave, V-wave). Both conditions induced significant decrease in MVC force, but to a greater extent after EB (−20.0 ± 5.1%, P < 0.001) than after ISO (−12.3 ± 4.6%, P = 0.037). While no effect was observed in M-wave amplitude after both exercises, EB resulted in greater decrease of normalized H-reflexes compared to isometric condition. Normalized V-wave significantly decreased only after EB. As a conclusion, the greater fatigability found after EB as compared to ISO was underlain by muscular as well as nervous factors. This higher impact was attributed to the dynamic nature of elastic band exercise as compared to isometric contractions.