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Official Journal of the American College of Sports Medicine C-18 Thematic Poster - Resistance Training May 30, 2013, 8:00 AM - 10:00 AM Room: 208 1005 Chair: Matthew J. Delmonico. University of Rhode Island, Kingston, RI. (No relationships reported) 1006 Board #1 May 30, 8:00 AM - 10:00 AM The Effect Of high-speed Power Training On Peak Power Production In Older adults Stephen P. Sayers, Gibson Kyle. University of Missouri - Columbia, Columbia, MO. (No relationships reported) PurPOsE:The production of muscle power requires both force and velocity, and maximizing the velocity component of power is critical to maintaining safety in older adults. For example, sufficient high-speed power could help move the lower limb quickly to stabilize the body and prevent a fall. The purpose of this study was to examine whether resistance training (RT) at high speed reduced the external resistance (and increased the velocity) at which peak power is produced. METhOds: 72 older adults (22m, 50f; Age=70.6±7.3yrs) participated in a lower extremity leg press RT program for 12 weeks. Participants were randomized to highspeed power training at 40% one-repetition maximum (1RM) (HSPT: n=25; 3 x 12-14 reps), slow-speed strength training at 80%1RM (SSST: n=25; 3 x 8-10 reps) or control (CON: n=22; stretching) 3 times/week for 12 weeks. Leg press 1RM, Peak power (PP; the highest value obtained from 40%-90% 1RM) and the corresponding peak power velocity [PPV] and peak power force [PPF] were obtained at baseline and 12 weeks. A 3 x 2 repeated measures ANOVA was used to compare changes from baseline to 12 weeks. Statistical significance was accepted at p
<strong>Thursday</strong>, May 30, 2013 S182 Vol. 45 No. 5 Supplement training session of each week by multiplying sets, repetitions, and weight lifted. Blood was drawn at pre- and post-training and 30 minutes prior to each strength training session to analyze the time course of changes in testosterone and cortisol levels. TV was analyzed using a 2x6 (group x time) repeated measures ANOVA, while hormonal response was analyzed using a 2x8. Significance was set at p
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