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Improving the Q:H Strength Ratio in Women Using Plyometric Exercises

Tsang, Kavin KW1; DiPasquale, Angela A2

Journal of Strength & Conditioning Research: October 2011 - Volume 25 - Issue 10 - pp 2740-2745
doi: 10.1519/JSC.0b013e31820d9e95
Original Research

Tsang, KKW and DiPasquale, AA. Improving the Q:H strength ratio in women using plyometric exercises. J Strength Cond Res 25(10): 2740–2745, 2011—Plyometric training programs have been implemented in anterior cruciate ligament injury prevention programs. Plyometric exercises are designed to aid in the improvement of muscle strength and neuromuscular control. Our purpose was to examine the effects of plyometric training on lower leg strength in women. Thirty (age = 20.3 ± 1.9 years) recreationally active women were divided into control and experimental groups. The experimental group performed a plyometric training program for 6 weeks, 3 d·wk−1. All subjects attended 4 testing sessions: before the start of the training program and after weeks 2, 4, and 6. Concentric quadriceps and hamstring strength (dominant leg) was assessed using an isokinetic dynamometer at speeds of 60 and 120°·s−1. Peak torque, average peak torque, and average power (AvgPower) were measured. The results revealed a significant (p < 0.05) interaction between time and group for flexion PkTq and AvgPower at 120°·s−1. Post hoc analysis further revealed that PkTq at 120°·s−1 was greater in the plyometric group than in the control group at testing session 4 and that AvgPower was greater in the plyometric group than in the control group in testing sessions 2–4. Our results indicate that the plyometric training program increased hamstring strength while maintaining quadriceps strength, thereby improving the Q:H strength ratio.

1Department of Kinesiology, California State University, Fullerton, Fullerton, California; and 2Michigan State University, East Lansing, Michigan

Address correspondence to Dr. Kavin K.W. Tsang,

© 2011 National Strength and Conditioning Association