Effects of warm-up on muscle glycogenolysis during intense exercise

Robergs, Robert A., Pascoe, David D., Costill, David L., Fink, William J., Chwalbinska-Moneta, Jolanta, Davis, Jacqueline, & Hickner, Robert (1991) Effects of warm-up on muscle glycogenolysis during intense exercise. Medicine and Science in Sports and Exercise, 23(1), pp. 37-43.

View at publisher


This study investigated the effects of preliminary exercise (warm-up) on glycogen degradation and energy metabolism during intense cycle ergometer exercise. After determination of VO2max, six male subjects were randomly assigned to perform warm-up (WU) and no warm-up (NWU) trials incorporating a 2 min standardized sprint ride (SR) at 120 of the power output attained at VO2max (POmax). Muscle biopsies and temperature (Tm) recordings were obtained from the vastus lateralis muscle. Tm was elevated above the resting level prior to the SR during the WU trial (37.7 ± 0.1 vs 35.4 ± 0.4°C; P < 0.05) and remained higher than the NWU trial after the SR (38.6 ± 0.2 vs 37.1 ± 0.4°C; P < 0.05). Similar trends existed for rectal temperature (Tr). The increases in Tm and Tr during the SR were both greater in the NWU trial (P < 0.05). Muscle glycogen degradation was similar for the WU and NWU trials (30.8 ± 3.7 vs 25.6 ± 3.7 mmol-kg-1, respectively). When blood and muscle lactate concentrations after the SR were expressed relative to values before the SR, the WU trial resulted in a lower accumulation of blood lactate (6.5 ± 0.9 vs 10.7 ± 0.8 mEq 1-1; P < 0.01) and muscle lactate (20.1 ± 0.1 vs 23.4 ± 2.2 mEq . kg-1 wet wt.; P < 0.05). Furthermore, oxygen consumption during the 1st min of the SR was higher in the WU trial (2.3 ± 0.2 vs 1.9 ± 0.21-min-1; P < 0.05). The changes in Tm indicated a potential for a maintained active hyperemia in the vastus lateralis following the warm-up. These results suggest that a maintained active hyperemia following warm-up may improve blood flow at the onset of high intensity exercise and transiently increase the aerobic contribution to muscle energy metabolism. Nevertheless, warm-up did not spare muscle glycogen during intense exercise.

Impact and interest:

40 citations in Scopus
Search Google Scholar™
39 citations in Web of Science®

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 96698
Item Type: Journal Article
Refereed: Yes
Keywords: adult; article; bicycle ergometry; body temperature; energy metabolism; exercise; glycogen muscle level; glycogenolysis; human; human experiment; hyperemia; male; muscle biopsy; muscle metabolism; normal human; priority journal; warming, Adult; Energy Metabolism; Exercise; Exercise Test; Exertion; Glycogen; Heating; Human; Hydrolysis; Lactates; Male; Muscles
ISSN: 1530-0315
Divisions: Current > Schools > School of Exercise & Nutrition Sciences
Deposited On: 11 Jul 2016 00:00
Last Modified: 21 Dec 2016 02:06

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page