J Korean Phys Ther.  2017 Feb;29(1):39-43. 10.18857/jkpt.2017.29.1.39.

Influence of Unilateral Muscle Fatigue in Knee and Ankle Joint on Balance and Gait in Healthy Adults

Affiliations
  • 1Department of Physical Therapy, Graduate School, Daegu University, Daegu, Korea. ymk616@hanmail.net
  • 2Department of Physical Therapy, College of Rehabilitation Science, Daegu University, Daegu, Korea.

Abstract

PURPOSE
This study was to investigate the effects of unilateral muscle fatigue in knee and ankle joints on balance and gait in healthy adults.
METHODS
Exercise inducing muscle fatigue in the knee joint consisted of concentric and eccentric contraction of dominant knee extensors in healthy adults by using the Leg Extension Rehap exercise machine (HUR, Finland). Exercise inducing muscle fatigue in the ankle joint was composed of voluntary contractions and forced contractions of the dominant plantar flexors in healthy adults. Exercises to induce muscle fatigue in the knee and ankle joints were performed until the subject complained of fatigue or pain, the occurrence of muscle fatigue was confirmed by electromyography. We measured static and dynamic balance using the Good Balance system and gait performance by RS-scan.
RESULTS
Static and dynamic balance ability and spatial-temporal gait decreased significantly after muscle fatigue in knee and ankle joint.
CONCLUSION
These results show that unilateral muscle fatigue of the lower extremities affected postural control and gait. Therefore, therapists and sport trainers should minimize the risks of fall and injuries related to unilateral muscle fatigue.

Keyword

Unilateral muscle fatigue; Balance; Gait

MeSH Terms

Adult*
Ankle Joint*
Ankle*
Electromyography
Exercise
Fatigue
Gait*
Humans
Knee Joint
Knee*
Leg
Lower Extremity
Muscle Fatigue*
Sports
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