Downloaded from http://journals.lww.com/acsm-msse by BhDMf5ePHKbH4TTImqenVCm6L2XNzbcTUxHSnOOcc5De35Uc++ERgsh+D98s1eM4 on 04/09/2020 715 2569 Board #233 May 31 11:00 AM - 12:30 PM Effects Of Caffeine On High-intensity Functional Training Performance In High- Vs. Low-caffeine Users Jesse A. Stein, Melitza R. Ramirez, Katie M. Heinrich. Kansas State University, Manhattan, KS. Email: jesse.stein.2@gmail.com (No relationships reported) Caffeine’s ergogenic effects during endurance and high-intensity exercise are well-established. However, habitual caffeine use may diminish its ergogenic properties. Researchers have investigated high-intensity functional training (HIFT) which incorporates endurance, weightlifting, and gymnastics modalities performed at a relatively high-intensity. However, the effects on caffeine supplementation on HIFT performance remain unknown. PURPOSE: Our study aimed to determine the effects of caffeine on HIFT performance between low- and high-caffeine users. METHODS: 13 HIFT-trained men were recruited. Participants completed a 7-day caffeine recall to determine low- (<200mg/day, n=7, age=29.3±8.4 years, HIFT-experience=5.2±3.2 years, weight=86±11.3 kg) and high-caffeine users (>300mg/day, n=6, age=27.7±4.2 years, HIFT-experience=2.8±2.4 years, weight=94.5±8.5 kg). Using a double-blind, crossover design, participants were randomized to consume 5mg/kg body weight of caffeine or a placebo 60 minutes before a HIFT workout. The HIFT workout consisted of as-many-rounds-as possible in 20 minutes of 5 pull-ups, 10 push-ups, and 15 air squats (1 round = 30 repetitions). HIFT performance was determined by the absolute difference in repetitions between the caffeine and placebo conditions (HIFT performance = repetitions during caffeine – repetitions during placebo). An independent-samples t-test was used to determine the differences in HIFT performance between low- and high-caffeine users. RESULTS: Low- and high-caffeine users completed 451±91 vs. 395±95 and 501±95 vs 415±99 repetitions during the placebo and caffeine conditions, respectively. HIFT performance was not significantly different between low- and high-caffeine users (50±38 vs. 20±18 repetitions, p=0.10). CONCLUSION: Caffeine’s ergogenic effect was not significantly different between low- and high-caffeine users’ performance, suggesting a no caffeine tolerance effect. HIFT athletes may benefit from supplementing caffeine without significant impairments from high-caffeine consumption. Future investigations should determine the effects of caffeine utilizing other HIFT workouts, and consider stratifying participants by daily caffeine consumption relative to body weight. 2570 Board #234 May 31 11:00 AM - 12:30 PM Low Dose of Caffeine Do Not Affect Torque and Rate of Torque Development Lucas Ugliara 1 , Martim Bottaro 1 , Sávio Alex 1 , Valdinar Junior 2 , Douglas Pinheiro 3 , João Paulo Telo Pimenta 1 , Amilton Vieira 1 . 1 University of Brasilia, Brasilia, Brazil. 2 National Academy of Police of Brazil, Brasilia, Brazil. 3 University Center of the Federal District, Brasilia, Brazil. Email: lucasugliaraunb@gmail.com (No relationships reported) Higher rate of torque/force development (RTD) and peak torque (PT) are associated with sports performance, lower risk of injuries and better recovery from injury. For elderly individuals, a higher RTD and PT are often associated with independence, quality of life, and reduced risk of falls. Evidences have shown that caffeine may enhance RTD in younger adults, but no information are available for elderly. PURPOSE: This study investigated the effect of a low dose of caffeine on PT and RTD of older (OG) and younger adults (YG). METHODS: Fifteen older (69±6 years; 70±12 kg; 169±6 cm) and 15 younger men (27±4 years; 78±9 kg; 176±7 cm) were tested for PT and RTD of the plantar flexors using a Biodex 4 dynamometer. They were familiarized with testing conditions in the first visit to the laboratory. The two experimental (3 mg/kg of caffeine or placebo) conditions were tested in two days, separated by at least 48 h. Subjects performed four maximal isometric voluntary contractions (MIVC) before and after supplementation. PT, RTD 0 to 50 ms (RTD 0-50 ) and RTD 100 to 200 ms (RTD 100-200 ) were analyzed. RTD and PT were normalized by body mass for comparisons. The Shapiro-Wilk test was used to check data normality and the mixed-model ANOVA was used to investigate time and group interaction. RESULTS: No difference (p>0.05) for time and group x time interactions were found for PT (OG: +0.6%; YG: +1.2%), RTD 0-50 (OG: +3.5%; YG: +4.8%), and RTD 100-200 (OG: - 3.1%; YG: - 2.3%). As expected, placebo did not show any significant difference. CONCLUSIONS: A low dose of caffeine did not affect PT and RTD in older and young adults. It could be hypothesized that a greater dose of caffeine may be required to improve muscle function in young and older subjects. 2571 Board #235 May 31 11:00 AM - 12:30 PM The Effects of Carbohydrate and Caffeine Mouth Rinse on Upper Body Muscular Strength and Endurance Raci Karayigit, Gülfem Ersöz. Ankara University Sport Sciences Faculty, Ankara, Turkey. Email: racikarayigit@hotmail.com (No relationships reported) Carbohydrate (CHO) and caffeine (CAF) are the most preferred nutritional ergogenic aids by elite athletes. CHO improves performance by sparing the muscle glycogen depots and CAF by antagonizing adenosine receptors. In recent years it has been shown that combined or seperated CHO and CAF mouth rinsing can improve sprint performance. However, more research is needed to examine the effect of CHO and CAF rinsing on strength and muscular endurance performance. PURPOSE : to investigate the effect of rinsing of CHO and CAF on bench press strength and endurance performance. METOTS: Twelve resistance trained men participated in this research. After the familiarization test day, participants participated in a total of 4 test days with a randomized, counterbalanced, crossover study design: 6% (1.5 gr.) weight / volume (w / v) CHO mouth rinse (CMR) with 25 ml water, mouth rinse with water (PLA), %1.2 CAF mouth rinse (CAFMR) and combined %6 CHO, %1.2 CAF mouth rinse (CCMR). After a 10-hour night fasting one repetition maximum (1RM) was determined for strength and %40 1RM strength endurance test over a 3 sets until repetition to failure with 2 seconds eccentric and 2 seconds concentric phase. Prior to strength and endurance measurements, participants rinsed the solutions in their mouths for 10 seconds. During the test protocol heart rate (hr), lactate (la), glucose (glu), felt arousal (fa) and ratings of perceived exertion (rpe) were measured. In the analysis of the data, single and two-way repeated measures analysis of variance were used. RESULTS: No significant differences were detected between trials as for strength, endurance, hr, glu, la, fa, rpe (P>0.05). DISCUSSION: This research has shown that orally rinsing of carbohydrate and caffeine does not have a significant effect on upper body strength and muscular endurance performance. The results of the study are in parallel with the literature. In future studies, higher doses of solutions may be rinsed in the mouth to investigate the effect on lower body strength and muscular endurance performance whose which muscle activation percentage is low during maximal voluntary contraction. keywords: Caffeine, carbohydrate, rinsing, ergogenic, 2572 Board #236 May 31 11:00 AM - 12:30 PM Effects of Caffeine on High-Intensity Functional Training Performance Melitza R. Ramirez, Jesse A. Stein, Katie M. Heinrich. Kansas State University, Manhattan, KS. (No relationships reported) Copyright © 2019 by the American College of Sports Medicine. Unauthorized reproduction of this article is prohibited.