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Performance decrements with high-intensity resistance exercise overtraining

A C Fry1, W J Kraemer, F van Borselen

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

Medicine and Science in Sports and Exercise
|September 1, 1994
PubMed
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High-intensity resistance exercise overtraining significantly decreased muscular strength in trained males. This study provides a model for understanding overtraining effects on performance and muscle adaptation.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Muscle Physiology

Background:

  • Overtraining syndrome is a complex condition affecting athletes.
  • Understanding the physiological mechanisms of overtraining is crucial for performance optimization and injury prevention.

Purpose of the Study:

  • To investigate a high-intensity resistance exercise overtraining protocol.
  • To determine its effects on muscular strength decrements in weight-trained males.

Main Methods:

  • Seventeen weight-trained males were divided into an overtraining (OT) group and a control (CON) group.
  • The OT group performed daily squat exercises at 100% of 1 repetition maximum (RM) for 2 weeks.
  • The CON group exercised once weekly at 50% 1 RM.

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Main Results:

  • The OT group exhibited a significant decrease in 1 RM performance (-12.2 kg) from baseline to 2 weeks (P < 0.05).
  • Isokinetic and stimulated isometric muscle force also significantly decreased in the OT group compared to the CON group.
  • Peripheral maladaptation was indicated by changes in stimulated force, creatine kinase (CK) activity, and lactate responses.

Conclusions:

  • The developed high-intensity resistance exercise protocol effectively induced overtraining and muscular strength decrements.
  • The findings suggest the periphery is a primary site of maladaptation during short-term, high-intensity resistance exercise overtraining.
  • This protocol serves as a valuable model for future overtraining research.