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Effect of betaine supplementation on power performance and fatigue.

Hoffman JR, Ratamess NA, Kang J, Rashti SL, Faigenbaum AD - J Int Soc Sports Nutr (2009)

Bottom Line: Each testing period occurred over a 2-day period.During day one of testing subjects performed a vertical jump power (VJP) and a bench press throw (BPT) power test.On day two of testing subjects performed two 30-sec Wingate anaerobic power tests (WAnT), each test separated by a 5-min active rest.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Health and Exercise Science, The College of New Jersey, PO Box 7718, Ewing, New Jersey 08628, USA. hoffmanj@tcnj.edu.

ABSTRACT

Background: The purpose of this study was to examine the efficacy of 15 days of betaine supplementation on muscle endurance, power performance and rate of fatigue in active college-aged men.

Methods: Twenty-four male subjects were randomly assigned to one of two groups. The first group (BET; 20.4 +/- 1.3 years; height: 176.8 +/- 6.6 cm; body mass: 77.8 +/- 13.4 kg) consumed the supplement daily, and the second group (PL; 21.4 +/- 4.7 years; height: 181.3 +/- 5.9 cm; body mass: 83.3 +/- 5.2 kg) consumed a placebo. Subjects were tested prior to the onset of supplementation (T1) and 7 (T2) and 14 days (T3) following supplementation. Each testing period occurred over a 2-day period. During day one of testing subjects performed a vertical jump power (VJP) and a bench press throw (BPT) power test. In addition, subjects were required to perform as many repetitions as possible with 75% of their 1-RM in both the squat and bench press exercises. Both peak and mean power was assessed on each repetition. On day two of testing subjects performed two 30-sec Wingate anaerobic power tests (WAnT), each test separated by a 5-min active rest.

Results: No differences were seen at T2 or T3 in the repetitions performed to exhaustion or in the number of repetitions performed at 90% of both peak and mean power between the groups in the bench press exercise. The number of repetitions performed in the squat exercise for BET was significantly greater (p < 0.05) than that seen for PL at T2. The number of repetitions performed at 90% or greater of peak power in the squat exercise was significantly greater for BET at both T2 and T3 than PL. No differences in any power assessment (VJP, BPT, WAnT) was seen between the groups

Conclusion: Two-weeks of betaine supplementation in active, college males appeared to improve muscle endurance of the squat exercise, and increase the quality of repetitions performed.

No MeSH data available.


Related in: MedlinePlus

Total Number of Repetitions Performed in the Bench Press Exercise. Data are reported as mean ± SD. BET = Betaine; PL = Placebo.
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Figure 2: Total Number of Repetitions Performed in the Bench Press Exercise. Data are reported as mean ± SD. BET = Betaine; PL = Placebo.

Mentions: No significant differences were seen at T2 or T3 in the total repetitions performed to exhaustion between BET and PL in the bench press exercise (see Figure 2). In addition, no differences between the groups were seen in the number of repetitions performed at 90% of both peak and mean power at those time points (see Figure 3a and 3b, respectively). The number of repetitions performed in the squat exercise at T2 for BET was significantly greater (p < 0.05) than that seen for PL (see Figure 4). Although BET appeared to perform more repetitions at T3 than PL, these differences were not statistically different (p = 0.06). The number of repetitions performed at 90% or greater of peak power in the squat exercise was significantly greater for BET at both T2 and T3 than PL (see Figure 5a), while the number of repetitions performed at 90% or greater of mean power was significant greater for BET than PL at T3 only (Figure 5b).


Effect of betaine supplementation on power performance and fatigue.

Hoffman JR, Ratamess NA, Kang J, Rashti SL, Faigenbaum AD - J Int Soc Sports Nutr (2009)

Total Number of Repetitions Performed in the Bench Press Exercise. Data are reported as mean ± SD. BET = Betaine; PL = Placebo.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2651845&req=5

Figure 2: Total Number of Repetitions Performed in the Bench Press Exercise. Data are reported as mean ± SD. BET = Betaine; PL = Placebo.
Mentions: No significant differences were seen at T2 or T3 in the total repetitions performed to exhaustion between BET and PL in the bench press exercise (see Figure 2). In addition, no differences between the groups were seen in the number of repetitions performed at 90% of both peak and mean power at those time points (see Figure 3a and 3b, respectively). The number of repetitions performed in the squat exercise at T2 for BET was significantly greater (p < 0.05) than that seen for PL (see Figure 4). Although BET appeared to perform more repetitions at T3 than PL, these differences were not statistically different (p = 0.06). The number of repetitions performed at 90% or greater of peak power in the squat exercise was significantly greater for BET at both T2 and T3 than PL (see Figure 5a), while the number of repetitions performed at 90% or greater of mean power was significant greater for BET than PL at T3 only (Figure 5b).

Bottom Line: Each testing period occurred over a 2-day period.During day one of testing subjects performed a vertical jump power (VJP) and a bench press throw (BPT) power test.On day two of testing subjects performed two 30-sec Wingate anaerobic power tests (WAnT), each test separated by a 5-min active rest.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Health and Exercise Science, The College of New Jersey, PO Box 7718, Ewing, New Jersey 08628, USA. hoffmanj@tcnj.edu.

ABSTRACT

Background: The purpose of this study was to examine the efficacy of 15 days of betaine supplementation on muscle endurance, power performance and rate of fatigue in active college-aged men.

Methods: Twenty-four male subjects were randomly assigned to one of two groups. The first group (BET; 20.4 +/- 1.3 years; height: 176.8 +/- 6.6 cm; body mass: 77.8 +/- 13.4 kg) consumed the supplement daily, and the second group (PL; 21.4 +/- 4.7 years; height: 181.3 +/- 5.9 cm; body mass: 83.3 +/- 5.2 kg) consumed a placebo. Subjects were tested prior to the onset of supplementation (T1) and 7 (T2) and 14 days (T3) following supplementation. Each testing period occurred over a 2-day period. During day one of testing subjects performed a vertical jump power (VJP) and a bench press throw (BPT) power test. In addition, subjects were required to perform as many repetitions as possible with 75% of their 1-RM in both the squat and bench press exercises. Both peak and mean power was assessed on each repetition. On day two of testing subjects performed two 30-sec Wingate anaerobic power tests (WAnT), each test separated by a 5-min active rest.

Results: No differences were seen at T2 or T3 in the repetitions performed to exhaustion or in the number of repetitions performed at 90% of both peak and mean power between the groups in the bench press exercise. The number of repetitions performed in the squat exercise for BET was significantly greater (p < 0.05) than that seen for PL at T2. The number of repetitions performed at 90% or greater of peak power in the squat exercise was significantly greater for BET at both T2 and T3 than PL. No differences in any power assessment (VJP, BPT, WAnT) was seen between the groups

Conclusion: Two-weeks of betaine supplementation in active, college males appeared to improve muscle endurance of the squat exercise, and increase the quality of repetitions performed.

No MeSH data available.


Related in: MedlinePlus