Cardiorespiratory and metabolic responses after exercise-induced muscle damage: the influence of lowered glycogen

Gavin, James P., Myers, Stephen D. and Willems, Mark E. T. (2018) Cardiorespiratory and metabolic responses after exercise-induced muscle damage: the influence of lowered glycogen. Journal of Sports Medicine and Physical Fitness, 58 (3). pp. 332-340. ISSN 0022-4707

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Abstract

BACKGROUND:
We examined the effect of early-onset of muscle damage and low muscle glycogen on cardiorespiratory and metabolic responses to low-intensity exercise.

METHODS:
Twelve men cycled for 10 min at 50% maximal oxygen uptake before, and 12 h after a morning downhill run (five, 8 min bouts at -12% gradient, with 2 min rests) under normal (NORM) and lowered glycogen (LOW) conditions, following a cross-over design with conditions separated by six weeks. Cardiorespiratory responses were recorded, with oxidation measures derived from stoichiometry equations.

RESULTS:
Muscle damage symptoms post-downhill (0 h) were similar between conditions. Carbon dioxide ventilatory equivalent increased 12 h post-downhill for LOW (P<0.05), but not NORM (P=0.7). A trend towards decreased respiratory exchange ratio (RER) was shown 12 h post-downhill for LOW (1.00±0.07 to 0.89±0.12, P=0.06), but not NORM (0.94±0.11 to 0.94±0.08; P=0.6). Twelve hours after LOW downhill running fat oxidation increased (0.21±0.18 g·min-1 to 0.36±0.27 g·min-1; P<0.05) and carbohydrate oxidation decreased (2.68±0.52 g·min-1 to 1.98±0.75 g·min-1; P<0.05); NORM oxidation rates were unchanged (fat: 0.26±0.18 g·min-1 to 0.33±0.18 g·min-1; P=0.5; carbohydrate: 2.51±0.49 g·min-1 to 2.29±0.47 g·min-1; P=0.3).

CONCLUSIONS:
Cycling at low-intensity 12 h post-downhill running with lowered muscle glycogen increased fat oxidation, decreased carbohydrate oxidation and elevated carbon dioxide ventilation. Damaging exercise with reduced glycogen availability increases fat utilization during subsequent low-intensity exercise as little as 12 h later.

Item Type: Article
Uncontrolled Keywords: Running - Exercise - Myalgia
Subjects: Q Science > QP Physiology
Divisions: Departments > Sport and Exercise Sciences
Related URLs:
Depositing User: Mark Willems
Date Deposited: 14 Sep 2018 08:45
Last Modified: 11 Oct 2018 10:46
URI: http://eprints.chi.ac.uk/id/eprint/3694

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