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Am J Physiol Regul Integr Comp Physiol 293: R2370-R2375, 2007. First published September 26, 2007; doi:10.1152/ajpregu.00780.2006
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ENVIRONMENTAL, EXERCISE AND RESPIRATORY PHYSIOLOGY

Metabolic response of trained and untrained women during high-intensity intermittent cycle exercise

E. Gail Trapp,1 Donald J. Chisholm,2 and Stephen H. Boutcher1

1University of New South Wales, Sydney, Australia; 2Garvan Institute, Sydney, Australia

Submitted 8 November 2006 ; accepted in final form 19 September 2007

The metabolic response to two different forms of high-intensity intermittent cycle exercise was investigated in young women. Subjects (8 trained and 8 untrained) performed two bouts of high-intensity intermittent exercise: short sprint (SS) (8-s sprint, 12-s recovery) and long sprint (LS) (24-s sprint, 36-s recovery) for 20 min on two separate occasions. Both workload and oxygen uptake were greater in the trained subjects but were not significantly different for SS and LS. Plasma glycerol concentrations significantly increased during exercise. Lactate concentrations rose over the 20 min and were higher for the trained women. Catecholamine concentration was also higher postexercise compared with preexercise for both groups. Both SS and LS produced similar metabolic response although both lactate and catecholamines were higher after the 24-s sprint. In conclusion, these results show that high-intensity intermittent exercise resulted in significant elevations in catecholamines that appear to be related to increased venous glycerol concentrations. The trained compared with the untrained women tended to show an earlier increase in plasma glycerol concentrations during high-intensity exercise.

intermittent exercise; catecholamines; glycerol; lactate


Address for reprint requests and other correspondence: E. G. Trapp, School of Medical Sciences, Faculty of Medicine, Univ. of New South Wales, Sydney 2052, Australia (e-mail: e.trapp{at}unsw.edu.au)






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