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Analysis of the effects of self-selected warm-up on isometric contraction performance and on surface electromyogram of vastus lateralis

Mandengue, Samuel H, Temfemo, Abdou, Miladi, Imed, Bishop, David, Moalla, Wassim and Ahmaidi, Said (2012) Analysis of the effects of self-selected warm-up on isometric contraction performance and on surface electromyogram of vastus lateralis. International Journal of Performance Analysis in Sport, 12 (1). pp. 24-36. ISSN 1474-8185 (print) 1474-8185 (online)

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Abstract

Background/objective: Self-selected warm-up also called reference warmup (RWU) was reported improving the performance endurance dynamic exercise. This study aimed to assess the effects of RWU on isometric endurance contraction. Methods: Ten university level athletes performed two endurance isometric exercises on a dynamometer, with no warm-up (I-NWU) and with a self-selected warm-up (I-RWU). Skin temperature (Tsk), heart rate (HR), oxygen consumption (VO2), blood lactate [La-], root mean square (RMS), mean frequency (MF) and time limit (Tlim) were measured to assess the effects of RWU. Results: Tsk, HR, (VO2) and [La-] were significantly raised (p < 0.01) after RWU compare to resting values, and remained significantly higher (p < 0.01) at the onset of I-RWU compare to I-NWU. Tlim significantly decreased after RWU (01:19 ± 00:25 for I-RWU vs. 01:49 ± 00:27 mm:ss for I-NWU) (p < 0.0005). RMS and MF showed no significant differences between I-NWU and I-RWU (p > 0.05). Conclusion: Self-selected warm-up impairs the performance of consecutive isometric exercise. Athletes appear less able to self-perceive an optimal warm-up for endurance isometric. Metabolic and electromyogram parameters changes did not thoroughly explained the decline of performance; this gives room for a possible anticipation of central fatigue regulation, which need further investigation.

Item Type: Article
Uncontrolled Keywords: ResPubID26627, warm-up, isometric contraction, time limit, root mean square, mean frequency
Subjects: FOR Classification > 1106 Human Movement and Sports Science
Faculty/School/Research Centre/Department > Institute of Sport, Exercise and Active Living (ISEAL)
Depositing User: Ms Phung.T Tran
Date Deposited: 07 Jan 2014 01:50
Last Modified: 14 May 2014 19:39
URI: http://vuir.vu.edu.au/id/eprint/23664
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Citations in Scopus: 0 - View on Scopus

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