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Profiles of 10-min sampled serum concentrations of LH and total, free, and bioavailable T in 16 healthy men. Data are shown as means ± SEM. Two different study sessions were done in each subject. After a baseline interval of continuous IV T infusion, seven consecutive, 45-min square-wave T pulses (pulsatile infusion) were given IV at 90-min intervals starting at 09:00, or continuous IV T infusion was continued from 09:00 onward.
