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Hamstring Activity Before and After Break-Point Angle Calculated By Smartphone Application During the Nordic

Toshiaki Soga1,2,3, Shota Yamaguchi4, Takayuki Inami4

  • 1Graduate School of Sport Sciences Waseda University.

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Summary

The Nordic Angle app accurately calculates the break-point angle (BPA) during the Nordic hamstring exercise (NHE). Biceps femoris (BF) electromyography (EMG) activity peaks near the BPA and significantly decreases afterward, highlighting the importance of specific knee flexion ranges for injury prevention.

Keywords:
Biceps femorisHamstring strain injuryRecurrence prevention

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Medicine

Background:

  • Previous research indicates a decline in biceps femoris (BF) electromyography (EMG) activity post-break-point angle (BPA) during the Nordic hamstring exercise (NHE).
  • No prior studies have examined BF EMG activity relative to the BPA as determined by a smartphone application (Nordic Angle app).

Purpose of the Study:

  • To investigate BF EMG activity before and after the BPA, utilizing the Nordic Angle app for BPA calculation.
  • To test the hypothesis that BF EMG activity peaks near the BPA and subsequently decreases.

Main Methods:

  • Participants underwent maximum voluntary isometric contraction (MVIC) testing for hamstring muscles.
  • BF EMG activity during NHE was normalized to %MVIC.
  • The Nordic Angle app analyzed iPhone video recordings to determine BPA.
  • Two-dimensional motion analysis software assessed knee flexion angles.
  • BF EMG activity was compared across seven knee flexion phases relative to the BPA.

Main Results:

  • No significant difference was found between the Nordic Angle app's BPA and the knee flexion angle at peak BF EMG activity.
  • BF EMG activity at 20-25° after BPA was significantly lower than activity at BPA ± 5°.

Conclusions:

  • BF EMG activity is crucial in specific knee flexion ranges (15-35°) during NHE for hamstring injury prevention.
  • Maintaining the Nordic Angle app's BPA within 35° is recommended to mitigate recurrent hamstring injuries.