TEST-RETEST OF SEX HORMONE RESPONSES TO ACTIVE AND PASSIVE ISOKINETIC PROTOCOLS IN MAN

Abstract

The purpose was to examine sex hormone responses to isokinetic exercise in man. Using Kin-Com isokinetic dynamometer, male students (n = 8; age = 21.5 ± 1.5 yrs; height = 175.6 ± 20.2 cm; weight = 78.6 ± 9.8 kg) performed test and retest using active and passive protocols. Active protocol consisted of maximal isokinetic concentric knee extensions and flexions tests at 120°/s with 24 hrs apart. Peak torque (PT), total work (TW), and average power (AP) while the active protocol were recorded. Passive movement was drive by dynamometer at speed of 120°/s. Hematocrit (Hct), blood glucose (G), lactate (L), seruum luteinzing hormones (LH), follicle stimulating hormone (FSH), testosterone (T) levels before and after 0, 5, 15, 30, and 60 min of the protocol were collected. Steroid honnones were determined by enzyme immunoassay (E.I.A.). Performance variables were 108.46 ± 15.67 Nm, 1858.69 ± 204.54 joules, and 119.62 ± 11.92 watts for PT, TW, and AP, respectively. Hct was found no change throughout the test. Following passive movement, no significant changes in all blood chemistries were found throughout the test and retest. Following active protocol, blood G levels were significantly elevated in 0 and 5, following the isokinetic protocol in test and 5 min after retest. Blood L were significantly elevated in 0, 5, and 15 min following the isokinetic protocol in test and retest Serum FSH levels were significantly increased in 15 and 30 min after test and 30 min after retest. Following 30 min of isokinetic test, serum LH level was significantly increased and no change after retest. Correlation of blood L, G, and serum T values between test and retest during active protocol were r = 0.67 to 0.89. In summary, 30 maximal isokinetic knee extensions and flexions stimulate blood L, G, and serum T to increase. An increased in serum T following exercise protocol is not influence by passive movement, blood volume and serum gonodatropin levels. Exercise-associated raise in blood G, L, serum FSH, LH, and T levels are repetable while perform isokinetic tests in this study Supported by NSC 89-2413-H-028-001