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Training-induced changes in hormonal and metabolic responses to submaximal exercise
Summary
Endurance training rapidly reduces exercise-induced hormonal responses. Significant adaptations in plasma glucagon and catecholamines occur within 3 weeks of vigorous training, showing early hormonal adaptation.
Area of Science:
- Exercise Physiology
- Endocrinology
- Sports Science
Background:
- Prolonged submaximal exercise elevates plasma glucagon and catecholamines.
- Endurance-trained individuals exhibit a blunted hormonal response compared to untrained subjects.
Purpose of the Study:
- To investigate the rapidity of hormonal adaptation to endurance training.
- To determine how quickly plasma glucagon and catecholamine responses to exercise decrease with training.
Main Methods:
- Six untrained subjects underwent 9 weeks of vigorous endurance training (30-50 min/day, 6 days/wk).
- Hormonal responses were assessed via 90-minute bicycle ergometer tests at 58% of maximal oxygen consumption at baseline and every 3 weeks.
Main Results:
- The majority of the reduction in plasma glucagon and catecholamine responses to exercise was observed after just 3 weeks of training.
- This indicates a rapid adaptation in the hormonal system's response to exercise stimuli.
Conclusions:
- The hormonal adaptations to vigorous endurance training occur very early in the training program.
- Significant changes in exercise-induced hormonal responses can be achieved within the first 3 weeks of consistent training.