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Related Experiment Videos

Catecholamine responses to short-term high-intensity resistance exercise overtraining

A C Fry1, W J Kraemer, F Van Borselen

  • 1Center for Sports Medicine, Pennsylvania State University, University Park 16802.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1994
PubMed
Summary

High-intensity weight training overtraining in males led to decreased strength and increased exercise-induced catecholamines, suggesting altered sympathetic nervous system activity and potential sympathetic overtraining syndrome.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Endocrinology

Background:

  • Overtraining syndrome is a complex condition affecting athletes.
  • Sympathetic nervous system (SNS) activity and catecholamines (epinephrine and norepinephrine) are crucial during exercise.
  • The specific impact of high-intensity resistance exercise overtraining on SNS response is not fully understood.

Purpose of the Study:

  • To investigate the effects of high-intensity resistance exercise overtraining on strength and catecholamine responses in weight-trained males.
  • To explore the relationship between exercise-induced sympathetic nervous system activity and overtraining.

Main Methods:

  • Seventeen weight-trained males were divided into an overtraining (OT) group (daily training at 100% 1RM) and a control group (weekly training at 50% 1RM) for 2 weeks.

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  • Strength assessments and measurements of resting and exercise-induced epinephrine and norepinephrine were conducted at baseline, midpoint, and endpoint.
  • Statistical analyses and correlation coefficients were used to evaluate changes and relationships.

    • Main Results:

    • The OT group exhibited significant decreases in strength by the study's end.
    • Resting catecholamine levels remained unchanged in both groups.
    • Exercise-induced epinephrine and norepinephrine concentrations significantly increased in the OT group by tests 2 and 3.
    • Correlation analyses indicated reduced skeletal muscle responsiveness to SNS activity in the OT group.

    Conclusions:

    • High-intensity resistance exercise overtraining is associated with altered exercise-induced sympathetic nervous system activity.
    • Increased exercise-induced catecholamine levels may be an early indicator of sympathetic overtraining syndrome.
    • These findings suggest a potential mechanism for the development of overtraining in athletes undergoing intense training regimens.