Title

EFFECT OF 15 DAYS OF BETAINE INGESTION ON CONCENTRIC AND ECCENTRIC FORCE OUTPUTS DURING ISOKINETIC EXERCISE

Authors

Authors

J. R. Hoffman; N. A. Ratamess; J. Kang; A. M. Gonzalez; N. A. Beller;S. A. S. Craig

Comments

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Abbreviated Journal Title

J. Strength Cond. Res.

Keywords

supplementation; ergogenic aid; sport nutrition; sport; SUPPLEMENTATION; CREATINE; NUTRITION; OSMOLYTE; STRESS; HUMANS; TIME; Sport Sciences

Abstract

Hoffman, JR, Ratamess, NA, Kang, J, Gonzalez, AM, Beller, NA, and Craig, SAS. Effect of 15 days of betaine ingestion on concentric and eccentric force outputs during isokinetic exercise. J Strength Cond Res 25(8): 2235-2241, 2011-The purpose of this study was to examine the efficacy of 15 days of betaine supplementation on peak concentric (CON) and eccentric (ECC) force during isokinetic exercise in active college-aged men. Eleven men volunteered for this study (21.7 +/- 5.1 years; height: 178.5 +/- 6.4 cm; body mass: 79.8 +/- 10.3 kg). Subjects were randomly assigned to either a supplement (BET) or placebo (PL) group. Supplementation occurred for 15 days. Subjects reported to the Human Performance Laboratory on 5 occasions during this period, separated by 72 hours, for a testing and exercise session on an isokinetic chest press device. After each exercise protocol, subjects rated their fatigue and muscle soreness on a 15-cm visual analog scale. Subjects then consumed no daily BET for 4 weeks but maintained familiarity with the exercise device once per week. After the washout period, subjects resumed the BET protocol using the opposite drink and repeated the same 15-day protocol. No differences were noted in maximum CON force output between pre (335.9 +/- 78.3 and 321.6 +/- 63.6 N) and post (330.3 +/- 74.8 and 330.2 +/- 71.6 N) workouts in both BET and PL, respectively. In addition, no differences were noted in maximum ECC force output between pre (352.0 +/- 90.6 and 324.4 +/- 85.2 N) and post (353.2 +/- 98.2 and 366.9 +/- 128.5 N) workouts in BET and PL, respectively. No differences in subjective measures of soreness and fatigue were seen, but a significant reduction in Delta fatigue was observed in BET compared to PL. In conclusion, 15 days of betaine supplementation did not increase peak CON or ECC force outputs during an isokinetic chest press but did appear to reduce subjective measures of fatigue to the exercise protocol.

Journal Title

Journal of Strength and Conditioning Research

Volume

25

Issue/Number

8

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

2235

Last Page

2241

WOS Identifier

WOS:000293063500023

ISSN

1064-8011

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