PMID: 16619096Apr 19, 2006Paper

The influence of external loads on movement precision during active shoulder internal rotation movements as measured by 3 indices of accuracy.

Journal of Athletic Training
Timothy J BrindleRobert Shapiro

Abstract

Using constant, variable, and absolute error to measure movement accuracy might provide a more complete description of joint position sense than any of these values alone. To determine the effect of loaded movements and type of feedback on shoulder joint position sense and movement velocity. Applied study with repeated measures comparing type of feedback and the presence of a load. Laboratory. Twenty healthy subjects (age = 27.2 +/- 3.3 years, height = 173.2 +/- 18.1 cm, mass = 70.8 +/- 14.5 kg) were seated with their arms in a custom shoulder wheel. Subjects internally rotated 27 degrees in the plane of the scapula, with either visual feedback provided by a video monitor or proprioceptive feedback provided by prior passive positioning, to a target at 48 degrees of external rotation. Subjects performed the internal rotation movements with video feedback and proprioceptive feedback and with and without load (5% of body weight). High-speed motion analysis recorded peak rotational velocity and accuracy. Constant, variable, and absolute error for joint position sense was calculated from the final position. Unloaded movements demonstrated significantly greater variable error than for loaded movements (2.0 +/- 0.7 degrees and 1.5 +/-...Continue Reading

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