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Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
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A Methodological Approach to Quantifying Plyometric Intensity.

Mark M Jarvis1, Phil Graham-Smith, Paul Comfort

  • 11English Institute of Sport, Birmingham, United Kingdom; and 2School of Health, Sport and Rehabilitation Sciences, Salford University, Salford, United Kingdom.

Journal of Strength and Conditioning Research
|May 3, 2014
PubMed
Summary
This summary is machine-generated.

Quantifying plyometric intensity is challenging. This study found that while concentric muscle activity doesn't vary, eccentric activity and force characteristics reliably measure plyometric intensity, aiding program control.

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Area of Science:

  • Exercise Physiology
  • Biomechanics
  • Sports Science

Background:

  • Quantifying plyometric exercise intensity is poorly defined compared to other training methods.
  • Accurate intensity measurement is crucial for effective plyometric programming and injury prevention.

Purpose of the Study:

  • To evaluate the suitability of neuromuscular and mechanical variables for quantifying plyometric exercise intensity.
  • To identify reliable and sensitive measures for describing plyometric intensity.

Main Methods:

  • Seven male subjects performed seven plyometric exercises.
  • Measured surface electromyography (SEMG) of vastus lateralis (VL) and biceps femoris (BF) during concentric (CON) and eccentric (ECC) phases.
  • Measured ground reaction forces for peak impact force (PF), peak eccentric power (PEP), and impulse (IMP).

Main Results:

  • SEMG demonstrated high reliability (r ≥ 0.82), except ECC VL during a 40-cm drop jump.
  • Force variables (PF, PEP, IMP) showed high reliability (r ≥ 0.85) and excellent statistical power.
  • CON SEMG did not significantly differ between exercises, while ECC SEMG distinguished between exercises with and without a landing.

Conclusions:

  • Force characteristics (PF, PEP, IMP) offer a reliable and sensitive method for precisely measuring plyometric intensity.
  • Eccentric muscle activity is influenced by the presence of a landing, unlike concentric activity.
  • These findings enable coaches and scientists to better control plyometric programming variables.