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MUSCLE FATIGUE INCREASES METABOLIC COSTS OF ERGOMETER CYCLING
WITHOUT CHANGING VO2 SLOW COMPONENT
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Aivaras
Ratkevicius1 ,
Arvydas Stasiulis2, Loreta Dubininkaite2 and Albertas Skurvydas2 |
1School of Medical Sciences, College of Life Sciences & Medicine,
Institute of Medical Sciences, Forresterhill, University of Aberdeen, Aberdeen
AB25 2ZD, UK
2Department of Applied Physiology and Health Education, Lithuanian Academy
of Physical Education, Sporto 6, Kaunas 3000, Lithuania
| Received |
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10 May 2006 |
| Accepted |
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26
July 2006 |
| Published |
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01
September 2006 |
©
Journal of Sports Science and Medicine (2006) 5, 440 - 448
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| ABSTRACT |
| The aim of the present study was to investigate effects of muscle
fatigue on oxygen costs of ergometer cycling and slow component of
pulmonary oxygen uptake (VO2) kinetics. Seven young men
performed 100 drop jumps (drop height of 40 cm) with 20 s of rest
after each jump. After the subsequent hour of rest, they cycled at
70, 105, 140 and 175 W, which corresponded to 29.6 ± 5.4, 39.4 ± 7.0,
50.8 ± 8.4 and 65.8 ± 11.8 % of VO2peak, respectively,
for 6 min at each intensity with 4-min intervals of rest in between
the exercise bouts. The VO2 response to cycling after the
exercise (fatigue condition) was compared to ergometer cycling without
prior exercise (control condition). From 3rd to 6th min of cycling
at 105, 140 and 175 W, VO2 was higher (p < 0.05-0.01)
when cycling in the fatigue compared to the control condition. Slow
component of VO2 kinetics was observed when cycling at
175 W in the control condition (0.17 ± 0.09, l·min-1, mean
± SD), but tended to decrease in the fatigue condition (0.13 ± 0.15
l·min-1). In summary, results of the study are in agreement
with the hypothesis that muscle fatigue increases oxygen costs of
cycling exercise, but does not affect significantly the slow component
of pulmonary oxygen uptake (VO2) kinetics.
KEY
WORDS: Muscle fatigue, energy cost, oxygen uptake, oxygen consumption
slow component.
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