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Strength Norms for the Knee in Women 25 Years and Older.

Di Brezzo, Ro; Fort, Inza L.
Journal of Strength & Conditioning Research: August 1987
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The purpose of this study was to collect and accumulate data for knee extensors and flexors in untrained women 25 years of age and older for the development of normatiue trends, There were 103 subjects assessed for percent body fat and peak torque values (PTV) of thepreferred legfor extension (EX) and flexion (FL) on a Cybex II isokinetic dynamometer at 60[degrees] /sec and 180[degrees] /sec. Results indicated a mean age of 36, years of age, 61 kg weight and 21.8% body fat. PTV for EX and FL at 60[degrees]/sec were 137 and 75 Newton-meters, respectively, representing a ratio of 54.7%. At 180[degrees]/set, PTV for EX and FL were 88 and 57 Newton-meters, respectively, for a 66.3% ratio. With high correlations between the two speeds, testing could be done at the speed more appropriate for the performance activity. Normative trends are presented and it is recommended that the 70th percentile should be considered minimum levels of strength for safety in participation and/or training. These may also serve as a rehabilitative guidelines until more extensive data are collected.

(C) 1987 National Strength and Conditioning Association