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Related Experiment Video

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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Hip and trunk muscles activity during nordic hamstring exercise.

Shideh Narouei1, Atsushi Imai2, Hiroshi Akuzawa2

  • 1Tehran University, School of Sport medicine Sciences, Tehran, Iran.

Journal of Exercise Rehabilitation
|May 10, 2018
PubMed
Summary

The Nordic hamstring exercise (NHE) activates hip and trunk muscles, with back extensors and internal obliques showing significant activity. This highlights the importance of synergistic muscle coactivation for hamstring injury risk assessment.

Keywords:
ElectromyographyMuscle activityNordic hamstring exercisePeak knee extension angle

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Medicine

Background:

  • The Nordic hamstring exercise (NHE) is a dynamic hamstring exercise.
  • Previous research focused on thigh muscle activation during NHE.
  • Trunk and hip muscle activity during NHE remains understudied.

Purpose of the Study:

  • To analyze hip and trunk muscle activity during the Nordic hamstring exercise.
  • To investigate the relationship between muscle activation and knee kinematics.

Main Methods:

  • Surface electromyography (EMG) and kinematic data were collected from ten healthy men.
  • Participants performed NHE with both downward and upward motions.
  • Statistical analyses included repeated measures ANOVA, paired t-tests, and Pearson correlation.

Main Results:

  • Semitendinosus and biceps femoris exhibited the highest muscle activity.
  • Back extensors and internal oblique muscles showed greater activity than other trunk muscles.
  • A decreased gluteus maximus to erector spinae (Gmax/ES) ratio correlated with peak knee extension angles.

Conclusions:

  • Trunk and hip muscle coactivation is crucial during NHE's eccentric and concentric phases.
  • Understanding these muscle dynamics can aid in assessing hamstring injury risk.
  • NHE provides valuable insights into hamstring and associated muscle function.