Effect of active warm-up on metabolism prior to and during intense dynamic exercise.

Gray, Susan, Vito, Giuseppe De and Nimmo, Myra A (2002) Effect of active warm-up on metabolism prior to and during intense dynamic exercise. Medicine and Science in Sport and Exercise, 34 (12). pp. 2091-2096. ISSN 0195-9131

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Purpose: This study investigated whether active warm-up (AW) would increase muscle acetylcarnitine concentration before exercise, thereby reducing the reliance on nonoxidative ATP production during subsequent high-intensity exercise.

Methods: Six female subjects performed a 30-s sprint at 120% of their maximal power output on an electronically braked cycle ergometer 5 min after undertaking an active warm-up. To exclude any effect of muscle temperature (Tm) on metabolism, AW was compared with control (C), which involved passively heating the muscle to the same temperature as that achieved by active warm-up (37.1 +/- 0.3 vs 37.2 +/- 0.2[degrees]C AW and C, respectively).

Results: Active warm-up significantly increased the concentration of acetylcarnitine from 4.5 +/- 1.5 mmol[middle dot]kg dry muscle (dm)-1 at rest to 9.4 +/- 1.6 mmol[middle dot]kg dm-1 before the onset of exercise. There was no change in acetylcarnitine concentration in C. During exercise the accumulation of muscle lactate was significantly less in AW compared with C (21.9 +/- 3.8 vs 34.3 +/- 2.3 mmol[middle dot]kg dm-1, respectively).

Conclusion: The main finding of this study was that there was less accumulation of blood and muscle lactate during intense dynamic exercise preceded by active warm-up, which could not be accounted for by a difference in Tm between trials immediately before the onset of exercise

Item Type: Article
Print ISSN: 0195-9131
Electronic ISSN: 1530-0315
Uncontrolled Keywords: Active warm-up; Muscle acetylcarnitine concentration; Nonoxidative ATP; Metabolism; Muscle lactate; Intense dynamic exercise
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
Dewey Decimal Subjects: 600 Technology > 610 Medicine & health > 612 Human physiology
600 Technology > 610 Medicine & health > 611 Human anatomy, cytology & histology
Library of Congress Subjects: Q Science > QP Physiology
Item ID: 1652
Depositing User: RAE Import
Date Deposited: 24 Jun 2008 16:14
Last Modified: 08 Oct 2015 09:19

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