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Quadriceps-hamstring EMG activity during functional, closed kinetic chain exercise to fatigue.

D M Pincivero1, C Aldworth, T Dickerson

  • 1Department of Physical Therapy, Eastern Washington University, Cheney 99004, USA. dpincivero@mail.ewu.edu

European Journal of Applied Physiology
|April 25, 2000
PubMed
Summary

Fatigue increases muscle activation in the quadriceps (vastus lateralis, vastus medialis) and hamstring (biceps femoris) during forward lunges. This suggests these muscles activate together to stabilize the knee joint as fatigue sets in.

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Area of Science:

  • Neuromuscular Physiology
  • Exercise Science
  • Biomechanics

Background:

  • Neuromuscular fatigue may impair co-contraction for joint stabilization.
  • The forward lunge is a closed kinetic chain exercise that challenges joint stability.

Purpose of the Study:

  • To investigate muscle activation patterns of the quadriceps and hamstring muscles during prolonged forward lunge exercise until volitional failure.
  • To determine if fatigue affects the co-activation of specific leg muscles.

Main Methods:

  • Eight males and two females performed repeated forward lunges until volitional failure.
  • Surface electromyography (EMG) measured vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF), and semitendinosus (ST) activation.
  • Heart rate was monitored throughout the exercise protocol.

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Main Results:

  • Significant increases in EMG activity were observed for the VL, VM, and BF muscles (P < 0.05).
  • No significant increase in activation was found for the ST muscle.
  • Heart rate significantly increased over the duration of the exercise.

Conclusions:

  • Muscle activation of the VL, VM, and BF muscles increases as a functional unit during forward lunges to volitional failure.
  • These findings suggest coordinated muscle activation to maintain knee joint stability despite developing fatigue.