Abstract
Context:Despite recent findings regarding lower extremity function after cryotherapy, little is known of the neuromuscular, kinetic, and kinematic changes that might occur during functional tasks.Objective:To evaluate changes in ground-reaction forces, muscle activity, and knee-joint flexion during single-leg landings after 20-minute knee-joint cryotherapy.Design:1 × 4 repeated-measures, time-series design.Setting:Research laboratory.Patients or Other Participants:20 healthy male and female subjects.Intervention:Subjects performed 5 single-leg landings before, immediately after, and 15 and 30 minutes after knee-joint cryo-therapy.Main Outcome Measures:Ground-reaction force, knee-joint flexion, and muscle activity of the gastrocnemius, hamstrings, quadriceps, and gluteus medius.Results:Cryotherapy did not significantly (P > .05) change maximum knee-joint flexion, vertical ground-reaction force, or average muscle activity during a single-leg landing.Conclusion:Knee-joint cryotherapy might not place the lower extremity at risk for injury during landing.
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