A comparison of the effects of exercise and lifestyle modification on the resolution of overuse symptoms of the shoulder in polio survivors: a preliminary study.

Abstract

To compare the effectiveness of exercise and lifestyle modification therapy in treating shoulder symptoms in polio survivors with lower-extremity weakness. A randomized parallel group study. Research laboratory. Twenty-three subjects recruited from a cohort of 194 polio survivors who had participated in a previous study had bilateral hip-extensor and knee-extensor weakness and reported experiencing shoulder pain on a regular basis with daily activity. Subjects were randomly assigned to 1 of 3 treatment groups. Members of group 1 were placed on a home exercise program that focused on strengthening their hip and knee extensors. Members of group 2 were instructed in lifestyle modification techniques designed to avoid shoulder overuse. Members of group 3 received both interventions. Shoulder symptoms were quantified in terms of number and severity. Isometric strength of bilateral hip and knee extensors was measured with a hand-held dynamometer. Symptoms improved in all 3 groups. However, members of the exercise-only group (group 1) were the only ones to show a significant difference in both number and severity of symptoms when pre- and posttreatment values were compared. Both exercise and lifestyle modification therapies that focus on reducing the stress related to lower-extremity weakness are effective in treating shoulder overuse symptoms in polio survivors. A trend toward greater improvement in shoulder symptoms in subjects who participated in the exercise program and who also showed a trend toward increased knee-extensor strength supports muscle strength and/or endurance as a key factor.