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Related Experiment Videos

Weight lifting training and left ventricular function in adolescent subjects.

M Sagiv1, M Sagiv, D Ben-Sira

  • 1Sports Medicine and Rehabilitation Division, The Zinman College, Wingate, Israel. sagiv@wincol.ac.il

The Journal of Sports Medicine and Physical Fitness
|July 21, 2007
PubMed
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Endurance and weight lifting training impact adolescent boys' heart function differently. Running improved left ventricular contractility and maximal oxygen uptake more than weight lifting.

Area of Science:

  • Cardiology
  • Sports Medicine
  • Adolescent Physiology

Background:

  • Exercise training in adolescence can alter myocardial adaptation.
  • Left ventricular (LV) function responses to exercise vary based on pressure or volume overload.
  • Understanding these differences is crucial for optimizing training regimens in young athletes.

Purpose of the Study:

  • To investigate the effects of endurance (running) versus weight lifting training on left ventricular contractility in healthy adolescent boys.
  • To compare echocardiographic findings between different training modalities and a control group.

Main Methods:

  • Sixty healthy adolescent boys were randomized into three groups: weightlifting, running, and control.
  • Training programs lasted 28 weeks, with 3-4 sessions per week.

Related Experiment Videos

  • Weightlifting involved dynamic resistance machines at 6-repetition maximum; running involved aerobic exercise at 65% of VO2max.

    • Main Results:

    • Running training significantly improved end-diastolic volume and end-systolic pressure-volume ratio at rest.
    • At peak exercise, runners showed enhanced wall stress, end-systolic pressure-volume ratio, and ejection fraction compared to weightlifters.
    • Maximal oxygen uptake (VO2max) significantly improved in runners, with higher maximal load in both training groups versus controls.

    Conclusions:

    • Exercise training mode significantly influences left ventricular function and contractility in adolescent boys.
    • Observed differences are attributed to volume-after-load relationships, not fundamental myocardial property changes.
    • This highlights the importance of considering training type for cardiovascular adaptations in adolescents.