The Effects of Calf-Muscle Fatigue on Sagittal-Plane Joint-Position Sense in the Ankle

in Journal of Sport Rehabilitation
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Context:

There is limited information on the effect of dynamic fatiguing of the plantar flexors on joint-position sense (JPS).

Objective:

To examine the effects of fatigue on JPS for ankle plantar flexion (PF) and dorsiflexion (DF).

Design:

A 2 × 2 factorial design.

Setting:

Research laboratory.

Participants:

20 healthy subjects (10 men, 10 women; age 21.75 ± 1.48 years).

Interventions:

The subjects were tested at 10° DF and 20° PF in the nonfatigued and fatigued conditions on a custom-built JPS device. To induce fatigue, subjects stood with both feet in the plantar-flexed position until they could no longer hold the posture.

Main Outcome Measures:

JPS absolute error was measured at 10° DF and 20° PF.

Results:

There was no significant main effect for condition, measurement, or interaction between condition and measurement.

Conclusion:

With no difference between conditions, the main controller of conscious JPS of the lower extremity might be the tibialis anterior.

Huston is with the Athletic Training Education Program, Heidelberg College, Tiffin, OH 44883. Sandrey is with the School of Physical Education, West Virginia University, Morgantown, WV 26506-6116. Lively is with the Dept of Medicine, West Virginia University, Morgantown, WV 26506-9167. Kotsko is an assistant athletic trainer at West Virginia University, Morgantown, WV 26507-0877.