Acute effects of a caffeine-containing supplement on bench press and leg extension strength and time to exhaustion during cycle ergometry

C. Russell Hendrix, Terry J. Housh, Michelle Mielke, Jorge M. Zuniga, Clayton L. Camic, Glen O. Johnson, Richard J. Schmidt, Dona J. Housh

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

The purpose of the present study was to examine the acute effects of a caffeine-containing supplement (SUPP) on 1 repetition maximum (1RM) bench press and leg extension strength, as well as time to exhaustion (TTE), during cycle ergometry at a power output that corresponded to 80% of VO2peak. The study used a double-blinded, placebo-controlled, crossover design. Twentyone untrained men (mean ± SD age = 23.0 ± 2.6 yr) were randomly assigned to take either the SUPP or placebo (PLAC) first. The SUPP contained 400 mg of caffeine, 66.7 mg of capsicum extract, 10 mg of bioperine, and 40 mg of niacin, and the PLAC was microcrystalline cellulose. Sixty minutes after taking either the SUPP or PLAC, the subjects were tested for 1RM bench press and leg extension strength, as well as TTE. After 1 week of rest, the subjects ingested the opposite substance (SUPP or PLAC) and were retested for 1RM bench press and leg extension strength, as well as TTE. The results indicated that the SUPP had no effect on 1RM bench press strength, 1RM leg extension strength, or TTE at 80% VO2peak. These findings did not support the use of the caffeinecontaining SUPP in the present study as an ergogenic aid in untrained individuals.

Original languageEnglish (US)
Pages (from-to)859-865
Number of pages7
JournalJournal of strength and conditioning research
Volume24
Issue number3
DOIs
StatePublished - Mar 2010

Keywords

  • Endurance

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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