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- Title
- The Effects of High-Intensity Interval Training and 28 days of [Beta]-Hydroxy-[Beta]-Methybutyrate Supplementation on Measures of Aerobic Power and Metabolic Thresholds.
- Creator
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Robinson, Edward, Stout, Jeffrey, Hoffman, Jay, Fragala, Maren, Fukuda, David, Ferguson, Matthew, University of Central Florida
- Abstract / Description
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Purpose: To examine the effects of 28 days of ?-hydroxy-?-methylbutyrate free acid (HMB) and high-intensity interval training (HIIT) on maximal oxygen consumption (VO2peak), ventilatory threshold (VT), respiratory compensation point (RCP) and time to exhaustion (Tmax) in college-aged men and women. Methods: Healthy men and women (n=34, age and V ?O2peak= 22.7+3.1yr and 39.3+5.0 mL.kg-1.min-1, respectively) participated in this study. All participants completed a series of tests prior and...
Show morePurpose: To examine the effects of 28 days of ?-hydroxy-?-methylbutyrate free acid (HMB) and high-intensity interval training (HIIT) on maximal oxygen consumption (VO2peak), ventilatory threshold (VT), respiratory compensation point (RCP) and time to exhaustion (Tmax) in college-aged men and women. Methods: Healthy men and women (n=34, age and V ?O2peak= 22.7+3.1yr and 39.3+5.0 mL.kg-1.min-1, respectively) participated in this study. All participants completed a series of tests prior and subsequent to treatment. A maximal oxygen consumption test was performed on a cycle ergometer to assess VO2peak, Tmax, VT, and RCP. The peak power output (Ppeak), power at VT (PVT) and power at RCP (PRCP) were also recorded from this test. Twenty-six subjects completed 12 HIIT (80-120% maximal workload) exercise sessions consisting of 5-6 bouts of a 2:1 minute cycling work to rest ratio protocol over a four-week period, while eight served as controls (CTL). In double-blind fashion, the HIIT groups were assigned into either a placebo (HIIT) or 3g per day of HMB (HMB-HIIT). Body composition was measured with dual energy x-ray absorptiometry (DEXA). Outcomes were assessed by ANCOVA with posttest means adjusted for pretest differences. Results: The HMB-HIIT intervention showed significant (p(<)0.05) gains in VO2peak, VT, and PVT versus the CTL and HIIT group. Both HIIT and HMB-HIIT treatment groups demonstrated significant (p(<)0.05) improvement over CTL for Ppeak, Tmax, RCP, and PRCP with no significant difference between the treatment groups. There were no significant differences observed for any measures of body composition. An independent-samples t-test confirmed that there were no significant differences between the training volumes for the HIIT and HMB-HIIT groups. Conclusion: These findings suggest that the addition of HMB supplementation may result in greater changes in VO2peak and VT than HIIT alone. Therefore, in college-aged men and women, the use of HMB supplementation may enhance the benefits of HIIT on aerobic performance measures.
Show less - Date Issued
- 2014
- Identifier
- CFE0005240, ucf:50604
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005240
- Title
- Effect of Acute L-Alanyl-L-Glutamine (Sustamine) and Electrolyte Ingestion on Plasma Electrolytes, Physiologic Measures, and Neuromuscular Fatigue during Endurance Exercise.
- Creator
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McCormack, William, Hoffman, Jay, Stout, Jeffrey, Fragala, Maren, Virgets, Thomas, University of Central Florida
- Abstract / Description
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The purpose of this study was to compare the efficacy of two dose levels of L-Alanyl-L-Glutamine in a commercially available sports drink to the sports drink only on time to exhaustion,neuromuscular fatigue and physiological measures during prolonged endurance exercise. Twelve endurance-trained males (23.5(&)#177;3.7 yrs; 175.5(&)#177;5.4 cm; 70.7(&)#177;7.6 kg) performed four trials, each consisting of 1 hr treadmill runs at 75% of VO2peak followed by a run to exhaustion at 90% of VO2peak....
Show moreThe purpose of this study was to compare the efficacy of two dose levels of L-Alanyl-L-Glutamine in a commercially available sports drink to the sports drink only on time to exhaustion,neuromuscular fatigue and physiological measures during prolonged endurance exercise. Twelve endurance-trained males (23.5(&)#177;3.7 yrs; 175.5(&)#177;5.4 cm; 70.7(&)#177;7.6 kg) performed four trials, each consisting of 1 hr treadmill runs at 75% of VO2peak followed by a run to exhaustion at 90% of VO2peak. The trials differed in type of hydration. One trial consisted of no hydration (NHY),another required ingestion of only a sports drink (ET), and two trials required ingestion of a low dose (LD) (300 mg?500 ml-1) and high dose (HD) of L-Alanyl-L-Glutamine (1 g?500 ml-1) mixedin the sports drink. During the fluid ingestion trials 250 ml were consumed every 15 min. Plasmaglutamine, glucose, electrolytes, and osmolality were measured prior to the run (PRE), and at 30, 45, and 60 min. VO2, RQ, and HR were measured every 15 min and surface electromyography (EMG) of the vastus lateralis and rectus femoris were measured every 10 min during the 1 hr run. Time to exhaustion was significantly longer during the LD and HD trials compared with NHY. Plasma glutamine concentrations were significantly elevated at 45 min in LD and HD trials, and remained elevated at 60 min during HD. Sodium concentrations increased with the beginning of exercise and remained stable for the duration of the 1 hr run. At 60 min plasma sodium was significantly lower in all trials compared with NHY. The results from this study indicated that ingestion of the alanine-glutamine dipeptide at either the low or high dose significantly improved time to exhaustion during high intensity exercise compared to a no hydration trial. These differences were not noted between ET and NHY.
Show less - Date Issued
- 2014
- Identifier
- CFE0005209, ucf:50649
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005209
