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The effectiveness on various types of straight leg raises and knee extensions on the muscles of the knee was examined. Thirteen men were asked to do both exercises, once with the hips neutral and the other time with the hip laterally rotated. Hip orientation made no significant difference in muscle activity.

Context: Closed kinetic chain exercises are reported to provide a more functional rehabilitation outcome. Objective: To determine the amount of muscle activity in 4 shoulder muscles during exercise on the Cuff Link. Design: Repeated measures. Setting: Laboratory. Subjects: 10 men and 10 women, age 18-50. Intervention: Subjects performed 3 sets of 5 revolutions on the Cuff Link in non-weight-bearing, partial-weight-bearing, and full-weight-bearing positions. Main Outcome Measures: Electromyography data were collected from the upper trapezius, anterior deltoid, serratus anterior, and pectoralis major and were expressed as percentage of maximal isometric contractions. Results: Significant differences were found across the weight-bearing conditions for all 4 muscles. Exercise on the Cuff Link required minimal to significant amounts of muscle recruitment. Conclusions: Muscle recruit-ment increases as weight bearing increases during use of the Cuff Link, suggesting an increase in dynamic stabilization of the glenohumeral joint. [ABSTRACT FROM AUTHOR]