Downloaded from http://journals.lww.com/acsm-msse by BhDMf5ePHKbH4TTImqenVNY7U4bpjOf5fYwXstOqDhVJ3GC1J59mRyucD0jkPUBLms86zAi7FVU= on 12/01/2018 124 455 Board #276 May 31 9:30 AM - 11:00 AM Testosterone And Cortisol Responses To Superslow And Traditional Resistance Exercise In College-aged Males Pragya Sharma Ghimire, Eonho Kim, Daeyeol Kim, Michael Bemben, FACSM, Debra Bemben, FACSM. The University of Oklahoma, Norman, OK. (Sponsor: Dr. Debra Bemben, FACSM) Email: pragya@ou.edu (No relationships reported) Recent evidence suggests that Superslow resistance training (SS), involving low intensity workloads and slow repetitions, has potential to produce improvements in muscular strength similar to traditional high intensity resistance training (TR). Few studies have compared endocrine responses to SS and TR protocols. PURPOSE: To compare acute hormonal responses to two resistance exercise protocols that have similar exercise volumes, but differ in intensity and contraction speed. METHODS: Thirteen males (18-35 years) participated in this randomized crossover study. Participants performed two protocols in random order separated by 3-week washout periods. For TR, participants completed 3 sets of 8 reps at 80% 1-RM for four upper and lower body exercises with 1.5 seconds of concentric and eccentric contraction speeds. For SS, participants performed 1 set of each exercise to voluntary failure at 50% 1-RM with 10 seconds concentric and 5 seconds eccentric contraction speeds. Fasting morning blood draws were taken before (Pre), immediately post exercise (IP), and 15 min post exercise (15P). Serum samples were analyzed for testosterone (TES) and cortisol (Cor) concentrations using ELISA. Lactate and hematocrit were also measured for each condition. RESULTS: There were no significant differences in baseline values between the two conditions. There was a significant (p<0.05) time effect for raw concentrations of TES and Cor. TES significantly (p<0.05) decreased from IP to 15P for both conditions (SS- 8.25 ± 1.37 ng/ml to 7.38 ± 1.26 ng/ml; TR- 8.50 ± 1.25 ng/ml to 6.94 ± 0.88 ng/ml). There was a trend (p=0.059) for Cor to increase from Pre to IP for both conditions (SS - 166.66 ± 15.15 ng/ml to 216.08 ± 18.16 ng/ml; TR- 157.55 ± 8.77 ng/ml to 201.03 ± 19.84 ng/ml). TES % change showed a significant time effect as it increased from Pre to IP (SS- 0.95 ± 4.39% ; TR- 15.39 ± 7.73% ) and decreased from Pre to 15P (SS- −5.48 ± 6.70% ; TR- −5.41 ± 3.79%). Cor % change was not different between the two conditions. Correcting for hemoconcentration eliminated the si gnificant responses. CONCLUSION: Both protocols showed similar patterns of hormonal responses, which may have been mediated by plasma volume shifts. This finding supports that SS exercise could be a beneficial alternative for those unable to perform high-intensity resistance exercise. 456 Board #277 May 31 9:30 AM - 11:00 AM Comparison Of Peak Power In The High Bar And Low Bar Squat Across Eight Loads Jacob R. Goodin, Caleb D. Bazyler, Jake R. Bernards, Joseph Walters, Satoshi Mizuguchi, Michael H. Stone. East Tennessee State University, Johnson City, TN. (No relationships reported) PURPOSE: To examine differences in peak power output between high bar (HBS) and low bar back squats (LBS). METHODS: Six trained males (25.0 ± 3.1 years, 1.78 ± 0.04 m, 87.6 ± 7.5 kg) with previous squatting experience (experience: 7.5 ± 4.1 years, HBS 1RM: 157.0 ± 15.3 kg, squat/bodyweight: 1.8 ± 0.18) completed the study using a crossover design. Subjects completed a 4-week familiarization phase with both conditions. Peak power data was collected over 2 sessions using dual uniplanar force plates synchronized with 2 string potentiometers on each side of the bar collecting at a sampling frequency of 1000 Hz using a BNC 2110 connector with an analog to digital converter. Subjects were randomly assigned to the HBS or LBS for 1 set of 3 repetitions at 20, 30, 40, 50, 60, 70, 80, and 90% of their most recent HBS training 1RM with 3 to 5 minutes’ rest between sets and >72 hours between testing conditions. A 2x8 repeated measures analysis of variance was used to determine interactions and main effects for condition and load with post-hoc tests conducted for statistical main effects. RESULTS: Analysis revealed significant main effects for load (p < 0.01) but not for condition. Peak power output was greatest at 70% of HBS 1RM for the LBS, and 80% of HBS 1RM for the HBS. CONCLUSIONS: According to this pilot data, athletes seeking to increase power production ability should choose a squatting style in which they feel most proficient and comfortable. Furthermore, either the HBS or LBS can be used as the primary squatting movement, or as a secondary movement to provide variation and remove linearity from the training program. However, based on previous research it is likely that sport specific biomechanical parameters will influence the squatting style selection for the majority of athletes who participate in sports that involve jumping, sprinting, and change of direction. Training with loads between 70% and 80% of HBS 1RM may be optimal for increasing power production ability. Further research using a larger population of well-trained athletes is suggested in order to more precisely compare HBS and LBS power outputs. 457 Board #278 May 31 9:30 AM - 11:00 AM Increased Performance of Upper-Body Strength Exercise: Effect of Leg Induced Increase in Blood Lactate Concentration Philipp Birnbaumer 1 , Alexander Müller 1 , Gerhard Tschakert 1 , Serge P. von Duvillard, FACSM 2 , Peter Hofmann, FACSM 1 . 1 Institute of Sports Science, Graz, Austria. 2 Institute of Sports Science, Salzburg, Austria. (Sponsor: Serge P. von Duvillard, FACSM) Email: pbirnbaumer@gmx.at (No relationships reported) Studies have shown that high systemic blood lactate concentrations led to inhibition of glycolysis and an increase of oxidative metabolism in subsequent anaerobic exercise. PURPOSE: The aim of this study was to examine the effect of increased blood lactate (La) concentration induced by high intensity leg exercise on net lactate production and performance in subsequent dynamic arm pull-ups. METHODS: Nine trained sport students (age: 25.1±1.9 yr; BMI: 21.7±1.4) performed arm pull-ups on a horizontal bar with legs placed on a box either with or without pre-load (PRE) in a randomized order. PRE was a 26.6±2s all out shuttle run to increase La to ~8 mmol.l -1 . Each testing was preceded by a 15 min standardized warm up. Time between warm-up and testing was 14 min. During testing, heart rate (HR) and respiratory gas exchange measures (VO 2 , VCO 2 , V E ) were monitored and La levels were measured at specific time points. Respiratory gas exchange measures were compared via the area under the curve (AUC). RESULTS: In pull-ups without PRE, La increased from 1.24±0.4 to 6.4±1.4 mmol.l -1 , whereas in conditions with PRE, La increased from 9.28±1.98 to 10.89±2 mmol.l -1 . In PRE conditions net La accumulation was significantly reduced by 75.5%. Performance was significantly increased by 1 rep (4%) after PRE. In PRE, net oxygen uptake VO 2 (50% AUC), pulmonary ventilation V E (34% AUC) and carbon dioxide VCO 2 production (26% AUC) were significantly increased during pull-ups but net respiratory exchange ratio (RER) was significantly decreased during work and recovery. CONCLUSION: Increased La induced by anaerobic leg exercise, inhibits glycolysis and increases oxidative metabolism in subsequent anaerobic dynamic upper body exercise. Increased oxidative metabolism during strength endurance exercise leads to superior performance outcome. This concept may be beneficial in sports climbing, due to a shift to an increased oxidative metabolism. However, this aspect needs to be evaluated further and in greater detail. Copyright © 2017 by the American College of Sports Medicine. Unauthorized reproduction of this article is prohibited.