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

SHONA L. HALSON, MATTHEW W. BRIDGE, ROMAIN MEEUSEN, BART BUSSCHAERT,
MICHAEL GLEESON, DAVID A. JONES, AND ASKER E. JEUKENDRUP

Time course of performance
changes and fatigue markers during intensified training
in trained cyclists. J Appl Physiol 93: 947–956, 2002.
First published April 5, 2002; 10.1152/japplphysiol.01164.
2001.—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 6-wk period. Subjects
completed 2 wk of normal (N), intensified (ITP), and
recovery training. A significant decline in maximal power
output (N  338  17 W, ITP  319  17 W) and a significant
increase in time to complete a simulated time trial (N 
59.4  1.9 min, ITP  65.3  2.6 min) 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 utilization, cycling efficiency, and
lactate, plasma urea, ammonia, and catecholamine concentrations.
These findings indicate that a state of overreaching
can already be induced after 7 days of intensified training
with limited recovery.
cycling; overtraining; overreaching; overload

Copyright © 2002 the American Physiological Society


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