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J Appl Physiol (April 5, 2002). doi:10.1152/japplphysiol.01164.2001
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Articles in PresS, published online ahead of print April 5, 2002
J Appl Physiol, 10.1152/jap.01164.2001
Submitted on November 26, 2001
Accepted on April 3, 2002

Time course of performance changes and fatigue markers during intensified training in cyclists

Shona L Halson1, Matthew W Bridge2, Romain Meeusen3, Bart Busschaert3, Michael Gleeson2, David A Jones2, and Asker E Jeukendrup2*

1 School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom; School of Human Movement Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
2 School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom
3 Department of Human Physiology and Sports Medicine, Vrije Universiteit Brussel, Brussels, Belgium

* To whom correspondence should be addressed. E-mail: aa.e.jeukendrup{at}bham.ac.uk.

To study the cumulative effects of exercise stress and subsequent recovery on performance changes and fatigue indicators, the training of eight endurance cyclists was systematically controlled and monitored for a six-week period. Subjects completed 2 weeks of normal (N), intensified (ITP) and recovery training (R), respectively. A significant decline in maximal power output (N=338±17W, ITP=319±17W) and a significant increase in time to complete a simulated time trial (N= 59.4±1.9min, ITP= 65.3±2.6min) occurred after ITP in conjunction with a 29% increase in global mood disturbance. The decline in performance was associated with a 9.3% reduction in maximal heart rate, a 5% reduction in maximal oxygen uptake and an 8.6% increase in perception of effort. Despite the large reductions in performance no changes were observed in substrate utilisation, cycling efficiency, lactate concentration, plasma urea, ammonia and catecholamine concentration. These findings indicate that a state of overreaching can already be induced after 7 days of intensified training with limited recovery.




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