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Related Experiment Videos

Plasma malondialdehyde increases transiently after ischemic forearm exercise.

M Christine Rodriguez1, Jacob Rosenfeld, Mark A Tarnopolsky

  • 1Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada.

Medicine and Science in Sports and Exercise
|November 6, 2003
PubMed
Summary

Oxidative stress markers like malondialdehyde (MDA) increase after forearm ischemic exercise, peaking immediately post-exercise. Precise timing is crucial for accurately measuring these exercise-induced oxidative stress changes.

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Area of Science:

  • Exercise physiology
  • Biochemistry
  • Skeletal muscle metabolism

Background:

  • Exercise and ischemia-reperfusion (I-R) can induce oxidative stress in skeletal muscle.
  • Previous studies show conflicting results on exercise-induced oxidative stress, measured by plasma carbonyls like malondialdehyde (MDA).
  • These discrepancies may arise from variations in the timing and methods used for measuring plasma carbonyls.

Purpose of the Study:

  • To determine the concentration and timing of aldehyde and ketone generation after ischemic forearm exercise.
  • To utilize High-Performance Liquid Chromatography (HPLC) analysis for precise measurement.

Main Methods:

  • Forearm ischemic exercise test (FIT) performed by males and females.
  • Blood flow occluded; six cycles of maximal isometric handgrip exercise executed.

Related Experiment Videos

  • Plasma carbonyls (MDA, 17-beta-estradiol, lactate) measured pre-, immediately post-, and 1, 3, 10 min post-FIT.

    • Main Results:

    • Plasma MDA levels increased significantly immediately post and 1 min post-FIT for both genders, returning to baseline by 3 min.
    • No significant changes observed in other measured carbonyls; gender and menstrual cycle did not impact results.
    • Lactate concentrations increased more in males, who also exhibited higher force output, but gender did not affect percent fatigue.

    Conclusions:

    • Accurate quantification of exercise-induced changes in MDA concentration requires careful consideration of blood sampling times post-metabolic stress.
    • Future research should standardize measurement timing to resolve conflicting findings on exercise-induced oxidative stress.