The effect of muscle fatigue on wrist joint position sense in healthy adults

Context:Fatigue of the shoulder rotator muscles may negatively affect joint position sense (JPS) and ultimately lead to injury.Objective:Recovery of shoulder JPS after muscle fatigue.Design:A repeated-measures study.Setting:Musculoskeletal research laboratory.Patients:Thirteen subjects participated in joint position error tests and isokinetic concentric strength assessment in shoulder rotation, before and after rotator muscle fatigue.Interventions:Local muscle fatigue was induced using isokinetic concentric contractions of the shoulder rotator muscles.Main Outcome Measurements:Shoulder rotator strength and JPS error signals were measured before fatigue, immediately after fatigue, and every ten minutes thereafter for one hour.Results:Before shoulder rotation muscle fatigue, the accuracy of shoulder JPS was 2.79 ± 1.67 degrees. After muscle fatigue, the accuracy decreased to 6.39 ± 2.90 degrees. Shoulder JPS was influenced up to 40 minutes after muscle fatigue, but shoulder strength was only affected for 10 minutes after muscle fatigue.Conclusions:Proprioceptive recovery was slower than strength following fatigue of the shoulder rotators.

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The Effects of Pelvis, Lumbar Spine and Cervical Spine Manipulation on Joint Position Sense in Healthy Adults

Journal of international academy of physical therapy research ◽

10.20540/jiaptr.2018.9.1.1381 ◽

2018 ◽

Vol 9 (1) ◽

pp. 1381-1386

Author(s):

Wontae Gong ◽

Keyword(s):

Cervical Spine ◽

Lumbar Spine ◽

Position Sense ◽

Joint Position Sense ◽

Healthy Adults ◽

Joint Position ◽

Cervical Spine Manipulation

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The Effects of Muscle Fatigue on Shoulder Joint Position Sense

The American Journal of Sports Medicine ◽

10.1177/03635465980260021701 ◽

1998 ◽

Vol 26 (2) ◽

pp. 262-265 ◽

Cited By ~ 149

Author(s):

James E. Carpenter ◽

Ralph B. Blasier ◽

Gregory G. Pellizzon

Keyword(s):

Muscle Fatigue ◽

Shoulder Joint ◽

External Rotation ◽

Testing Machine ◽

Position Sense ◽

Joint Position Sense ◽

Joint Position ◽

Isokinetic Testing ◽

Shoulder Dysfunction ◽

Arm Dominance

Proprioception, or joint position sense, probably plays an important role in shoulder joint function. In this study, we assessed the effect of muscle fatigue on shoulder proprioception in 20 volunteers with no shoulder abnormalities. Shoulder proprioception was measured as the threshold to first detection of humeral rotation with the joint at 90° of abduction and 90° of external rotation. Subjects were tested while rested, exercised on a isokinetic testing machine until fatigued, and then retested in an identical fashion. Both shoulders were tested, and the order of dominant and non-dominant shoulder was randomized. Shoulder proprioception was analyzed for its dependence on arm dominance, direction of rotation, and muscle fatigue. Subjects detected external rotation after significantly less movement than they did internal rotation. Overall, before exercise, motion was detected after a mean of 0.92° of rotation. After exercise, this threshold to detection of movement increased to 1.59°, an increase of 73%. This significant increase occurred with both internal and external rotation. The decrease in proprioceptive sense with muscle fatigue may play a role in decreasing athletic performance and in fatigue-related shoulder dysfunction. It remains to be determined if training can lessen this loss in position sense.

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