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The American Journal of Sports Medicine 19:76-81 (1991)
© 1991 SAGE Publications

Preseason strength and flexibility imbalances associated with athletic injuries in female collegiate athletes

Joseph J. Knapik, MS ScD

U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts

Connie L. Bauman, ATC, MS

Wellesley College, Wellesley, Massachusetts

Bruce H. Jones, MPH, MD

U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts

John McA. Harris, MD

U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts

Linda Vaughan, PhD

Wellesley College, Wellesley, Massachusetts

One hundred thirty-eight female collegiate athletes, par ticipating in eight weightbearing varsity sports, were administered preseason strength and flexibility tests and followed for injuries during their sports seasons. Strength was measured as the maximal isokinetic torque of the right and left knee flexors and knee extensors at 30 and 180 deg/sec. Flexibility was meas ured as the active range of motion of several lower body joints. An athletic trainer evaluated and recorded injuries occurring to the athletes in practice or compe tition. Forty percent of the women suffered one or more injuries. Athletes experienced more lower extremity injuries if they had: 1) a right knee flexor 15% stronger than the left knee flexor at 180 deg/sec; 2) a right hip extensor 15% more flexible than the left hip extensor; 3) a knee flexor/knee extensor ratio of less than 0.75 at 180 deg/sec. There was a trend for higher injury rates to be associated with knee flexor or hip extensor imbalances of 15% or more on either side of the body. These data demonstrate that specific strength and flexibility imbalances are associated with lower extrem ity injuries in female collegiate athletes.




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