The effects of different doses of caffeine on maximal strength and strength-endurance in women habituated to caffeine.
1RM test
Bench Press
Ergogenic substances
Resistance exercise
Time under Tension
Journal
Journal of the International Society of Sports Nutrition
ISSN: 1550-2783
Titre abrégé: J Int Soc Sports Nutr
Pays: United States
ID NLM: 101234168
Informations de publication
Date de publication:
30 Mar 2021
30 Mar 2021
Historique:
received:
29
08
2020
accepted:
12
03
2021
entrez:
30
3
2021
pubmed:
31
3
2021
medline:
6
7
2021
Statut:
epublish
Résumé
The main goal of this study was to assess the acute effects of 3 and 6 mg of caffeine intake per kg of body mass (b.m.) on maximal strength and strength-endurance in women habituated to caffeine. Twenty-one healthy resistance-trained female students (23.0 ± 0.9 years, body mass: 59.0 ± 6.6 kg), with a daily caffeine intake of 5.8 ± 2.6 mg/kg/b.m. participated in a randomized, crossover, double-blind design. Each participant performed three experimental sessions after ingesting either a placebo (PLAC) or 3 mg/kg/b.m. (CAF-3) and 6 mg/kg/b.m. (CAF-6) of caffeine. In each experimental session, the participants underwent a 1RM test and a strength-endurance test at 50 %1RM in the bench press exercise. Maximal load was measured in the 1RM test and the time under tension, number of preformed repetitions, power output and bar velocity were registered in the strength-endurance test. The one-way ANOVA showed a main effect of caffeine on 1RM bench press performance (F = 14.74; p < 0.01). In comparison to the PLAC (40.48 ± 9.21 kg), CAF-3 (41.68 ± 8.98 kg; p = 0.01) and CAF-6 (42.98 ± 8.79 kg; p < 0.01) increased 1RM bench press test results. There was also a significant increase in 1RM for CAF-6 when compared to CAF-3 (p < 0.01). There was a main effect of caffeine on time under tension during the strength-endurance test (F = 13.09; p < 0.01). In comparison to the PLAC (53.52 ± 11.44 s), CAF-6 (61.76 ± 15.39 s; p < 0.01) significantly increased the time under tension during the maximal strength-endurance test. An acute dose of 3-to-6 mg/kg/b.m. of caffeine improves maximum strength. However, these doses of caffeine had minimal ergogenic effect on strength-endurance performance in women habituated to caffeine.
Identifiants
pubmed: 33781269
doi: 10.1186/s12970-021-00421-9
pii: 10.1186/s12970-021-00421-9
pmc: PMC8008648
doi:
Substances chimiques
Performance-Enhancing Substances
0
Caffeine
3G6A5W338E
Types de publication
Journal Article
Randomized Controlled Trial
Langues
eng
Sous-ensembles de citation
IM
Pagination
25Subventions
Organisme : Charles University
ID : UNCE/HUM/032
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