INTERMITTENT PNEUMATIC COMPRESSION EFFECT ON ECCENTRIC EXERCISE-INDUCED SWELLING, STIFFNESS, AND STRENGTH LOSS

Objective: The purpose was to determine if intermittent pneumatic comp ression (IPC) affects muscle swelling, stiffness, and strength loss re sulting from eccentric exercise-induced injury of the elbow flexors. W e hypothesized that the compression would decrease swelling and stiffn ess. Design: Repeated measures design with a before-after trial compar ison within each day. Setting: Conducted at a university Somatic Dysfu nction Laboratory. Subjects: Twenty-two college women students were st udied. They had not been lifting weights or otherwise participating in regular arm exercise for the 6 months before the study. They had no h istory of upper extremity injury or cardiovascular disease. Interventi ons: Subjects performed one bout of eccentric exercise at a high load to induce elbow flexor muscle injury. Uniform IPC was applied on the d ay of exercise and daily for 5 days at 60mmHg, 40 seconds inflation, 2 0 deflation for 20 minutes. Main Outcome Measures: Measurements of arm circumference, stiffness, and isometric strength were recorded before exercise, then before and after IPC for 5 days after exercise. Passiv e muscle stiffness was measured on a device that extends the elbow ste pwise and records the torque required to hold the forearm at each elbo w angle. Results: Circumference and stiffness increased and strength d ecreased during the 5 days post-exercise (p < .05). IPC significantly decreased circumference and stiffness most notably on days 2 and 3 aft er exercise (p < .05). The strength loss was not affected by IPC. Conc lusion: IPC is effective in temporarily decreasing the swelling and st iffness after exercise-induced muscle injury. (C) 1995 by the American Congress of Rehabilitation Medicine and the American Academy of Physi cal Medicine and Rehabilitation