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Related Experiment Videos

Fatigue after submaximal intensive stretch-shortening cycle exercise.

V Strojnik1, P V Komi

  • 1University of Ljubljana, Faculty of Sport, Ljubljana, Slovenia. VSTR 64 UNI-LJ.SI.

Medicine and Science in Sports and Exercise
|July 27, 2000
PubMed
Summary

Submaximal stretch-shortening exercise induces low-frequency fatigue in muscles, likely due to reduced calcium release per action potential. This study investigated neuromuscular fatigue sites after such exercise.

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Area of Science:

  • Exercise Physiology
  • Neuromuscular Physiology
  • Sports Science

Background:

  • Neuromuscular fatigue is a complex phenomenon affecting athletic performance.
  • Stretch-shortening cycle (SSC) exercise, common in sports, can lead to significant fatigue.
  • Understanding the specific sites and mechanisms of fatigue is crucial for training and injury prevention.

Purpose of the Study:

  • To investigate the neuromuscular fatigue sites following submaximal intensity stretch-shortening cycle exercise.
  • To analyze changes in muscle torque production and activation patterns after exhaustive SSC exercise.

Main Methods:

  • Twelve male subjects performed exhaustive sledge jumps at 60% of maximal height.
  • Isometric knee extension torque was measured using electrical stimulation at various frequencies (20 Hz and 100 Hz) and during maximal voluntary contractions (MVC).

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  • Blood lactate and serum creatine-kinase levels were monitored, alongside vastus lateralis and quadriceps femoris muscle activation.

    • Main Results:

    • Significant increases in blood lactate and serum creatine-kinase indicated metabolic stress and muscle damage.
    • Low-frequency (20 Hz) torque production was significantly reduced, while high-frequency (100 Hz) torque remained unaffected, suggesting low-frequency fatigue.
    • Rate of torque development during MVC was more impaired than maximal torque, with increased muscle activation, indicating altered neural drive.

    Conclusions:

    • Submaximal SSC exercise leads to low-frequency fatigue, characterized by impaired force production at lower stimulation frequencies.
    • The findings suggest that reduced calcium release per action potential is a likely cause of this fatigue.
    • The observed changes in torque development and muscle activation highlight complex neuromuscular adaptations following exhaustive SSC exercise.