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dc.contributor.authorHunter, Angus-
dc.contributor.authorAlbertus-Kajee, Yumna-
dc.contributor.authorGibson, Alan St Clair-
dc.description.abstractThis study investigated the effect of dynamic exercise in a hot environment on muscle fibre conduction velocity (MFCV) of the knee extensors during a sustained isometric contraction. Seven trained male cyclists (mean [±SD], age, and V_ O2max were 35 ± 9.9 and 57.4 ± 6.6 ml kg1 min1) cycled for 50 min at 60% of peak power output in either: (1) 40 C (HOT); or (2) 19 C (NEUTRO); and (3) remained passive in 40 C (PASS). Post-intervention a 100 s maximal sustained isometric contraction (SMC) of the knee extensors was performed. Rectal temperature increased (p < 0.01) for both HOT and NEUTRO with PASS unchanged and with HOT rising higher (p < 0.01) than NEUTRO (38.6 ± 0.4 vs. 37.6 ± 0.4 C). Muscle temperature increased (p < 0.01) for all three conditions with HOT rising the highest (p < 0.01) (40.3 ± 0.5 vs. 38.3 ± 0.3 and 37.6 ± 1.3 C for NEUTRO and PASS, respectively). Lactate showed higher accumulation (p < 0.01) for HOT than NEUTRO (6.9 ± 2.3 vs. 4.2 ± 2.1 mmol l1). During SMC the torque, electromyography root mean squared (RMS) and MFCV all significantly (p < 0.01) declined. Only in HOT did MFCV decline significantly (p < 0.01) less than torque and RMS (9.9 ± 6.2% vs. 37.5 ± 17.8% and 37.6 ± 21.4%, respectively). In conclusion, during exercise induced hyperthermia, reduced motor unit recruitment as opposed to slower conducting properties of the muscle fibre appears to be responsible for the greater reduction in torque output.en_UK
dc.relationHunter A, Albertus-Kajee Y & Gibson ASC (2011) The effect of exercise induced hyperthermia on muscle fibre conduction velocity during sustained isometric contraction, Journal of Electromyography and Kinesiology, 21 (5), pp. 834-840.-
dc.rightsPublished in Journal of Electromyography and Kinesiology by Elsevier. Journal home page:
dc.subjectMuscle fibre conduction velocityen_UK
dc.subjectSustained isometric contractionen_UK
dc.titleThe effect of exercise induced hyperthermia on muscle fibre conduction velocity during sustained isometric contractionen_UK
dc.typeJournal Articleen_UK
dc.citation.jtitleJournal of Electromyography and Kinesiology-
dc.type.statusPost-print (author final draft post-refereeing)-
dc.contributor.affiliationUniversity of Cape Town-
dc.contributor.affiliationNorthumbria University-
Appears in Collections:Faculty of Health Sciences and Sport Journal Articles

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