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Interrelationships between skeletal muscle adaptations and performance as studied by detraining and retraining
Acta Physiologica Scandinavica
|February 1, 1979
Summary
Even short detraining periods significantly impact well-trained runners
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- Well-trained athletes often experience detraining during inactivity.
- Understanding physiological adaptations to detraining and retraining is crucial for performance optimization.
Purpose of the Study:
- To investigate the physiological effects of short-term detraining and retraining in well-trained runners.
- To assess changes in enzyme activity, maximal oxygen uptake, performance, heart rate, and blood lactate.
Main Methods:
- Six well-trained runners underwent 15 days of detraining followed by 15 days of retraining.
- Measurements included enzyme activities (SDH, LDH), VO2 max, submaximal run performance, heart rate, and blood lactate levels.
Main Results:
- Detraining significantly decreased SDH and LDH activity, VO2 max, and submaximal performance.
- Retraining did not fully restore enzyme activity but improved VO2 max and performance.
- Detraining increased heart rate and decreased blood lactate; retraining reversed these changes.
Conclusions:
- Short-term detraining causes significant physiological detriments in highly trained individuals.
- Full recovery of muscle enzyme activity requires longer retraining periods than tested.
- Physiological adaptations to training are sensitive to even brief periods of inactivity.