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Related Experiment Videos

Hemodynamics during a machine-aided flexibility protocol

L E Holt1, T W Pelham, P D Campagna

  • 1Sport Science and Fitness Laboratory, Dalhousie University, Halifax, Nova Scotia.

Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee
|December 1, 1995
PubMed
Summary

Proprioceptive neuromuscular facilitation (PNF) exercises significantly increased hemodynamic factors like heart rate and blood pressure. These changes were observed during and after exercise, with higher values noted at maximal voluntary isometric contraction (MVIC).

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Area of Science:

  • Exercise Physiology
  • Rehabilitation Medicine
  • Sports Science

Background:

  • Proprioceptive neuromuscular facilitation (PNF) is a stretching technique.
  • Understanding the physiological responses to PNF is crucial for exercise prescription.
  • New machines offer enhanced feedback for PNF exercises.

Purpose of the Study:

  • To investigate the hemodynamic responses to PNF flexibility exercises.
  • To compare responses at maximal voluntary isometric contraction (MVIC) and 50% MVIC.
  • To assess the safety of PNF exercises within American College of Sports Medicine guidelines.

Main Methods:

  • Fifteen subjects performed four PNF exercises using specialized machines.
  • Hemodynamic measurements (heart rate, blood pressure) were recorded before, during, and after exercise.

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  • Exercise involved isometric contractions followed by antagonist concentric contractions at MVIC and 50% MVIC.

    • Main Results:

    • Significant increases in heart rate, systolic, and diastolic blood pressure were observed during and after PNF exercise compared to resting values.
    • Hemodynamic values were higher at MVIC than at 50% MVIC, though not significantly.
    • All measured hemodynamic values remained within safe limits as defined by the American College of Sports Medicine.

    Conclusions:

    • PNF flexibility exercises induce significant acute hemodynamic responses.
    • The intensity of contraction (MVIC vs. 50% MVIC) influences hemodynamic responses.
    • PNF exercises, when performed with new feedback machines, are safe for individuals adhering to established exercise guidelines.