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Official Journal of the American College of Sports Medicine point system. One point deductions were assigned on SLF for 5 knots± on airspeed, 100ft± on altitude, or 5 degrees± in heading. Total time (s) for CT was recorded across 3 segments. rEsuLTs: There were a higher number of total penalty points on SLF with the ED vs. the placebo (P) in the MED (ED 58.4±9.2 vs. P 34.0 ±6.6, p .05, respectively). Time to complete CT was higher for P in MED vs. HI (349.4±26.5s vs. 279.1±17.5s, p 0.05) in time to complete CT between ED and P or MED vs. HI. CONCLusIONs: With highly technical flight skills requiring precision, coordination and sequencing of movements, EDs may reduce overall performance. Athletes and pilots should cautiously interpret claims for the performance enhancing effects of energy drinks when shifting focus and technical motor skills are involved. 1102 Board #47 May 30, 8:00 AM - 9:30 AM The Effects of a supplement designed to attenuate the adverse Effects of Fatigue Adam J. Wells, Adam M. Gonzalez, Gerald T. Mangine, Nadia S. Emerson, William P. McCormack, Adam R. Jajtner, Jeremy R. Townsend, Tyler C. Scanlon, Edward H. Robinson, IV, Jeffrey R. Stout, FACSM, Jay R. Hoffman, FACSM, Maren S. Fragala. University of Central Florida, Orlando, FL. (No relationships reported) Phosphatidylserine (PS) supplementation may play a role in attenuating the adverse effects of physical fatigue on cognition, mood, and motor function. However, the results from recent investigations remain equivocal. PurPOsE: To examine the effect of ingesting a supplement (S) containing PS (400 mg·day-1) and caffeine (100 mg·day-1) for 14 days, on measures of cognitive function (CF), reaction time (RT), and mood (MD), following an acute exercise stress. METhOds: Twenty-one recreationally trained men and women (age: 22.5 ± 3.4 yrs; height: 1.76 ± 1.0 m; weight: 77.6 ± 12.6 kg; body fat: 14.6 ± 6.6 %) volunteered for this double-blind, controlled study. Participants completed two acute bouts of resistance exercise (T1 and T2), separated by two weeks of supplementation with S or control (C). Measures of RT (Dynavision D2), CF (Serial Subtraction Test), and MD (Profile of Mood States) were assessed pre and post exercise at T1 and T2. A 2 x 2 (time x treatment) repeated measures analysis of variance was used to analyze the data. rEsuLTs: When collapsed across groups, a significant decrease (p = 0.05) in RT performance (# of strikes) was seen in the 60-second reaction drill from pre to post exercise at T1. All other RT tests were similar from pre to post exercise at T1. RT was not significantly changed in response to PS (p > 0.05), and no significant between group differences were noted at T2. When collapsed across groups, a significant increase in the number of correct answers, and a significant decrease in time to answer was seen from pre to post workout at T1 (p = 0.004 and p = 0.007, respectively) and T2 (p = 0.004 and 0.018, respectively) in the CF test. A significant increase in total mood score was observed for C but not for S (p = 0.034). Additionally, C experienced a 13% greater increase (p = 0.031) in pre to post exercise perception of fatigue compared to S. A significant decrease in confusion was observed in S at T2 (p = 0.041). CONCLusION: Ingestion of 400 mg·day-1 of PS and 100 mg·day-1 of caffeine for 14-days appears to attenuate post-exercise MD scores and perception of fatigue, but does not improve reaction time in recreationally trained individuals following acute resistance exercise. An acute bout of resistance exercise may improve CF; however, PS provides no further benefit. 1103 Board #48 May 30, 8:00 AM - 9:30 AM Physiological responses To a Thermogenic Nutritional supplement during rest, Exercise, and recovery In Women Haley C. Bergstrom 1 , Terry J. Housh, FACSM 1 , Daniel A. Traylor 1 , Robert W. Lewis Jr. 1 , Glen O. Johnson, FACSM 1 , Richard J. Schmidt 1 , Dona J. Housh, FACSM 2 , Nathaniel D.M. Jenkins 1 , Kristen C. Cochrane 1 . 1 University of Nebraska-Lincoln, Lincoln, NE. 2 University of Nebraska Medical Center, Lincoln, NE. (No relationships reported) PurPOsE: The purpose of this study was to examine the acute physiological responses to a thermogenic nutritional supplement at rest, during low-intensity exercise, and recovery from exercise in women. METhOds: Twelve recreationally active women (mean ± SD; age, 22.9 ± 3.1 years) were recruited for this randomized, double-blinded, placebo-controlled, crossover study. The nutritional supplement capsules included 200 mg caffeine, 100 mg capsicum extract, 2 mg piperine, 250 mg boswellia serrate extract, 500 mg dried ginger root, 100 mg cinnamon bark, 20 mg niacin, and 500 mg macuna pruriens. The placebo capsules were matched in size and appearance and contained microcrystalline cellulose. Each testing session consisted of 4 phases: 1) 30 min of initial resting measures, followed by ingestion of the placebo or thermogenic nutritional supplement; 2) 50 min of post-supplementation resting; 3) 60 min of treadmill walking (3.2 – 4.8 Vol. 45 No. 5 Supplement S203 km·hr-1); and 4) 50 min of post-exercise resting. Indirect calorimeter was used to measure energy expenditure (EE) and oxygen consumption rate (VO2). The EE and VO2 variables were recorded and reported as 10 min averages. During exercise, the rating of perceived exertion (RPE) was recorded every 15 min. Statistical analyses included separate 2-way repeated-measures ANOVAs (condition x time), 1-way repeated-measures ANOVAs, and paired t-tests (p < 0.05). rEsuLTs: There were no significant differences for any of the measures between the supplement and placebo groups during the initial 30 min resting or the 50 min post-supplementation time periods. During exercise, EE was 3 to 4% greater for the supplement than the placebo at each 10 min average, with no significant differences in RPE. Post-exercise, EE was 5 to 7% greater for the supplement group than the placebo group at 10, 20, and 40 min, VO2 was 5% greater at 20 min and 4% greater at 40 min. CONCLusION: The current findings indicated that the thermogenic nutritional supplement increased EE and VO 2 with no effect on RPE. These findings suggested that supplementation with the blend of ingredients in the thermogenic nutritional supplement may aid in a weight management program that includes long duration (60 min) low intensity (walking) exercise. This study was supported by a clinical trial grant from General Nutrition Corporation. 1104 Board #49 May 30, 8:00 AM - 9:30 AM Effects of acute Caffeine Intake on Wingate Test Performance in a Creatine supplemented state Andrew M. Seaton1 , Charles R.C Marks1 , Mark J. Seaton1 , Hermann J. Engels, FACSM2 , Tamara Hew-Butler, FACSM1 . 1 2 Oakland University, Rochester, MI. Wayne State University, Detroit, MI. (No relationships reported) PurPOsE: This study investigated the effects of acute caffeine consumption on supramaximal exercise performance in a creatine monohydrate supplemented state. METhOds: Fourteen college age adults (age: 23.9±4.3 years; weight: 69.6±11.6 kg; height: 171.9±8.1 cm) on a supplement-free diet performed a standard leg cycle ergometry Wingate test (WanT) to establish baseline (C0) performance characteristics for peak anaerobic power (watts/kg; PAP), mean anaerobic power (watts/kg; MAP), and rate of fatigue (%; RF). Participants then underwent a creatine monohydrate supplementation intervention in the form of a 6 day loading phase (20 g/day) followed by a 3 day maintenance phase (5 g/day). Using a double-blind protocol and a randomized test order, at the beginning and conclusion of the maintenance phase, each subject completed a WanT 60 min after the acute intake of a placebo (C1) or 6 mg/kg caffeine (C2). Data were analyzed with a one-way repeated measure ANOVA (alpha < .05) and using protected paired t tests (Bonferroni - Holm’s sequential adjustment) for post hoc analysis (SPSS v14.0). rEsuLTs: There was a significant main effect (p 0.05) for RF (C0 = 46.1 ± 8.0 %; C1 = 50 ± 4.9 %; C2 = 51.3 ± 7.1 %) and MAP (C0 = 3.1 ± 0.6 W/kg; C1 = 3.1 ± 0.7 W/kg; C2 = 3.2 ± 0.6 W/kg). CONCLusION: The present data indicate 6 mg/kg acute caffeine consumption does not significantly affect creatine monohydrate loading’s impact on PAP, MAP, or RF during a WanT. 1105 Board #50 May 30, 8:00 AM - 9:30 AM The Effects of Caffeine on Time to Exhaustion during Treadmill running Amanda Locke, Kevin Sartin, Danny Accola, Steve Burns. University of Central Missouri, Warrensburg, MO. (Sponsor: Michael Godard, FACSM) (No relationships reported) Caffeine is often used to enhance athletic performance. Today, committees are questioning if it should be a substance banned during competition. PurPOsE: The primary purpose of this study was to determine the effect caffeine had on the time until exhaustion while running. METhOds: Participants included 8, moderately active males (22.0 ± 1.7 years, 184.9 ±5.3 cm, 83.8 ±11.4 kg). Subjects reported to the lab on 3 separate occasions, with no less than 48 hours of rest in between each visit. On the first visit, subjects ran on a treadmill to determine their max heart rate. This was done by increasing the speed until volitional exhaustion; the final speed and heart rate are considered maximums. They returned to the lab two additional times and ran at 70% of their max heart rate, determined during the first visit, for 15 minutes. Immediately after the 15 minutes concluded, the treadmill speed was increased to the final speed at which exhaustion was reached during trial one. This pace was maintained until volitional exhaustion. On one occasion subjects were given water with caffeine (5mg/kg) and on the other water without caffeine 45 min prior to each run. Rate Perceived Exertion (RPE) was recorded every 5 minutes and after the exhaustive bout. Blood lactate was sampled immediately Abstracts were prepared by the authors and printed as submitted. Thursday, May 30, 2013
Thursday, May 30, 2013 S204 Vol. 45 No. 5 Supplement following each test, and every minute for three minutes thereafter. Heart rate was monitored throughout all tests. rEsuLTs: A repeated measures ANOVA was conducted to determine if time until exhaustion increased due to the consumption of caffeine before exercise. No significant difference in the time to exhaustion was observed when compared to the placebo (caffeine time = 208.0±77.1 seconds, placebo time = 154.9±44.1 seconds). CONCLusION: These results suggest that caffeine does not have an effect on time to exhaustion following submaximal running. Key Words: caffeine, time to exhaustion. 1106 Board #51 May 30, 8:00 AM - 9:30 AM The Influence of Caffeine on Power Output and response Time Erika Rauk, David Connor, Allison Brumet, Eric Strubeck, Karen M. Brown, John G. Seifert. Montana State University, Bozeman, MT. (No relationships reported) Athletes consume caffeine supplements (CAF) in hopes of improving endurance performance, strength performance, and a reducing RPE. Caffeine is typically dosed on a per kg BW basis before or during exercise in a research setting and usually in a fasted state. It is likely that in a real world scenario caffeinated products are typically ingested by competitive and recreational athletes per given serving size or volume, regardless of BW. Caffeine is known to be a central nervous system stimulant. It is not known, however, if CAF would affect a marker of central fatigue following endurance exercise. PurPOsE: To compare auditory response time (RT), HR, RPE, metabolic, and power output (PO) responses between the ingestion of a commercially available CAF product and a flavored, non-caloric placebo (PL) during endurance cycling. METhOds: Fourteen subjects completed a 120 min work bout which was divided into 8x15 min intervals (13 min at 70% VO2max, 2 min at 90% VO2max), and ended with a 6 min PO performance task. Caffeine was ingested at a dose of 256 mg caffeine/ hr; 200 mL/hr of plain water was co-ingested with CAF and PL. Blood glucose, HR, RPE, RER, and RT were measured throughout the 120 min exercise. The PO task required subjects to cycle at their highest sustainable power output for 6 min. Cycling resistance was set at 5% BW. The CAF and PL treatments were administered in a double blind, randomly assigned protocol. All subjects exercised at 3 hrs post prandial. Data are listed as mean (+ SD). rEsuLTs: No statistical differences between treatments were observed for mean PO (p=.08, CAF: 290 +57, PL: 282 +63 W), RT (p=.06, CAF: 0.232 +.06, PL: 0.226 +.04 sec), HR (CAF: 143.1 + 15.6, PL: 141.0 + 14.5 bpm), RPE (CAF: 13.5 + 1.2, PL: 13.8 + 1.9), and RER (CAF: .87 +.04, PL: .86 +.04), and BG (CAF: 4.9 +.6, PL: 4.7 +.8 mM/L). CONCLusION: Ingestion of a moderate dose of CAF (~6.8 mg/kg BW) did not result in significant improvements in RT and PO when evaluated against a non-caloric PL. Additionally, CAF ingestion did not change substrate utilization, as measured by BG and RER, during exercise. These results indicate that the CAF formula used in this study has minimal influence on physiological function and performance under the given conditions. This study was supported by a grant from PacificHealth Laboratories, Inc. 1107 Board #52 May 30, 8:00 AM - 9:30 AM The Influence Of Carbohydrate, Protein, and Caffeine On Power Output and response Time David A. Connor, Eric Strubeck, Karen M. Brown, John G. Seifert. Montana State University, Bozeman, MT. (No relationships reported) Caffeine has been reported to confer numerous benefits such as improved endurance and high intensity performances, reaction time and fat metabolism, and reduced RPE. The ingestion of CHO generally leads to improved endurance and high intensity performances while markers of central fatigue are mitigated with the feeding. There has been interest if combining CHO and caffeine would have a synergistic effect on response time and performance as the CHO would aid in physical performance while the caffeine would potentially improve markers of central fatigue. Purpose. To compare auditory response time (RT), power output (PO), and metabolic responses between a commercially available CHO + PRO + caffeine sports gel (GEL) and a caffeine supplement (CAF) during endurance cycling. Methods. 14 cyclists completed two cycling trials by ingesting GEL (22.5g CHO/hr, 3.75g PRO/hr, 188 mg caffeine/ hr) or CAF (256 mg caffeine/hr) along with 200 mL/hr of water during the 2 hr exercise. Auditory RT was assessed by averaging stop switch times from10 beeps. Exercise was divided into 8x15 min intervals of 13 min at 70% VO2max and 2 min at 90% VO2max. Blood glucose (BG), RT, HR, RPE, and RER were also collected during the test. After the 2 hr ride, riders completed a 6 min cycling test where they attempted maintain as great of PO as possible at a resistance of 5% BW. Significance was set at p < 0.05. All data are listed as mean (+SD). Results. The GEL resulted in statistically greater mean PO (309.1 +/- 60 W vs. 290.2 +/- 57 W); RT (0.219 +/- .049 sec vs. 0.232 +/- .060 sec); BG (5.5 +/- 0.8 mM/L vs. 4.9 +/- 0.7 mM/L), and lower HR (138.5 +/- 16.0 bpm vs. 143.1 +/- 15.6 bpm) and RPE (13.0 +/- 1.7 vs. 13.5 +/- 1.2) than the CAF treatment. Conclusions. Co-ingestion of CHO, PRO and caffeine MEDICINE & SCIENCE IN SPORTS & EXERCISE ® significantly improved RT and PO (by 5.7% and by 6.5%, respectively) compared to CAF even though the caffeine dose was 27% lower with GEL than CAF. The present study mimicked real life conditions by having subjects fed prior to exercise, providing doses that represented what may occur in a ‘real world’ setting, and by measuring performance by a muscular PO test and a measure that may be indicative of central fatigue. These results demonstrate the synergistic effects of CHO, PRO, and caffeine and the performance benefits to athletes. Supported by a grant from PacificHealth Laboratories, Inc. 1108 Board #53 May 30, 8:00 AM - 9:30 AM role of Caffeine Intake on short Bouts Frequency in Light and Moderate-to-Vigorous Physical activity Patterns Pedro B. Júdice, Catarina N. Matias, Diana A. Santos, João P. Magalhães, Luís B. Sardinha, Analiza M. Silva. Technical University of Lisbon, Lisbon, Portugal. (No relationships reported) Shifting sedentary behavior (SedB) to light intensity physical activity (LPA) by introducing short bouts (SB) into daily routine is expected to contribute to higher PA energy expenditure (PAEE). If caffeine (Caf) intake plays a role in increasing the frequency of SB during free-living conditions is unknown. Purposes: The aim of this study was twofold: i) to determine the impact of a moderate dose of Caf on daily number of SB of at least 1 up to 5 min of either LPA or moderate-to-vigorous PA (MVPA) and PAEE; ii) to analyze the association between SB and PAEE under both conditions. METhOds: Using a double-blind crossover trial (ClinicalTrials. govID;NCT01477294) with two conditions (4-day each with 3-day washout) randomly ordered as Caf (5mg/kg/day) and placebo (Plc) (malt-dextrin) administered twice a day (2.5mg/kg), a total of 21 active males, low caffeine users (
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