Affiliations: [a] Physiotherapy Associates, Scottsdale Sports Clinic, 7272 E. Indian School Road, Suite 10, Scottsdale, AZ 85251, USA | [b] United States Tennis Association, Key Biscayne, FL, USA
Note: [*] Corresponding author.
Abstract: The primary purpose of this study was to provide descriptive data on elite junior tennis players regarding isokinetically measured quadricep and hamstring strength. Eighty-seven (62 male and 25 female) elite junior tennis players underwent bilateral isokinetic knee extension/flexion testing on a Cybex 300 series dynamometer system. Speeds of 180 and 300 degrees per second were used for males, and 300 degrees per second was used for females. The parameters of peak torque (PT) and single repetition work (SRW) were analyzed. Results showed no significant difference between extremities for either quadricep or hamstring strength for males or females at any testing speed for either (PT) or (SRW). This finding of bilateral symmetry is in contrast to upper extremity isokinetic strength data showing significant unilateral dominance in tennis players from this population. Data from this study are presented in the relative form and are important for interpretation of isokinetic lower extremity strength tests from athletes in this population. Based on the results of this study, it appears that symmetrical lower extremity strength can be expected in the quadricep and hamstring musculature of elite junior tennis players.