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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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EFFECT OF DIFFERENT LEVELS OF LOCALIZED MUSCLE FATIGUE ON KNEE POSITION SENSE |
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William S. Gear |
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Department of Health, Physical Education and Recreation, University of Minnesota Duluth, Duluth, MN, USA |
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© Journal of Sports Science and Medicine (2011) 10, 725 - 730 |
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| ABSTRACT | |||
| There is little information available regarding how proprioceptive
abilities decline as the amount of exertion increases during exercise. The
purpose of this study was to determine the role of different levels of fatigue
on knee joint position sense. A repeated measures design was used to examine
changes in active joint reposition sense (AJRS) prior to and following three
levels of fatigue. Eighteen participants performed knee extension and flexion
isokinetic exercise until torque output was 90%, 70%, or 50% of the peak
hamstring torque for three consecutive repetitions. Active joint reposition
sense at 15, 30, or 45 degrees was tested following the isokinetic exercise
session. Following testing of the first independent measure, participants
were given a 20 minute rest period. Testing procedures were repeated for
two more exercise sessions following the other levels of fatigue. Testing
of each AJRS test angle was conducted on three separate days with 48 hours
between test days. Significant main effect for fatigue was indicated (p
= 0.001). Pairwise comparisons indicated a significant difference between
the pre-test and following 90% of peak hamstring torque (p = 0.02) and between
the pre-test and following 50% of peak hamstring torque (p = 0.02). Fatigue
has long been theorized to be a contributing factor in decreased proprioceptive
acuity, and therefore a contributing factor to joint injury. The findings
of the present study indicate that fatigue may have an effect on proprioception
following mild and maximum fatigue. Key words: Proprioception, fatigue, isokinetic. |
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