In this repeated measures design , 27 participants ( 23 females , 4 males ; mean age = 31.3 years , SD = 10.7 ) with current or recent history of lower extremity chronic conditions and less than 10 degrees ankle dorsiflexion measured with the knee in extension on the involved side ( s ) performed five 30-second gastrocnemius stretching trials in pronation and supination on each side in a randomly determined sequence .