Caffeine increases strength and power performance in resistance‐trained females during early follicular phase

Article


Norum, M., Risvang, L., Bjørnsen, T., Dimitriou, L., Rønning, P., Bjørgen, M. and Raastad, T. 2020. Caffeine increases strength and power performance in resistance‐trained females during early follicular phase. Scandinavian Journal of Medicine & Science in Sports. 30 (11), pp. 2116-2129. https://doi.org/10.1111/sms.13776
TypeArticle
TitleCaffeine increases strength and power performance in resistance‐trained females during early follicular phase
AuthorsNorum, M., Risvang, L., Bjørnsen, T., Dimitriou, L., Rønning, P., Bjørgen, M. and Raastad, T.
Abstract

The effects of 4 mg·kg‐1caffeine ingestion on strength and power were investigated for the first time, in resistance‐trained females during the early follicular phase utilizing a randomized, double‐blind, placebo‐controlled, crossover design. Fifteen females (29.8±4.0 years, 63.8±5.5 kg [mean±SD]) ingested caffeine or placebo 60 minutes before completing a test battery separated by 72 hours. One‐repetition maximum (1RM), repetitions to failure (RTF) at 60% of 1RM, were assessed in the squat and bench press. Maximal voluntary contraction torque (MVC) and rate of force development (RFD) were measured during isometric knee‐extensions, while utilizing interpolated twitch technique to measure voluntary muscle activation. Maximal power and jump height were assessed during countermovement jumps (CMJ). Caffeine metabolites were measured in plasma. Adverse effects were registered after each trial. Caffeine significantly improved squat (4.5±1.9%, effect size [ES]: 0.25) and bench press 1RM (3.3±1.4%, ES: 0.20), and squat (15.9±17.9%, ES: 0.31) and bench press RTF (9.8±13.6%, ES: 0.31), compared to placebo. MVC torque (4.6±7.3%, ES: 0.26), CMJ height (7.6±4.0%, ES: 0.50) and power (3.8±2.2%, ES: 0.24) were also significantly increased with caffeine. There were no differences in RFD or muscle activation. Plasma [caffeine] was significantly increased throughout the protocol and mild side‐effects of caffeine were experienced by only 3 participants. This study demonstrated that 4 mg·kg‐1 caffeine ingestion enhanced maximal strength, power and muscular endurance in resistance‐trained and caffeine‐habituated females during the early follicular phase, with few adverse effects. Female strength and power athletes may consider using this dose pre‐competition and ‐training as an effective ergogenic aid.

Keywordscaffeine supplementation; female athletes; muscular activation level; muscular endurance ; strength and power performance
Research GroupPhysiology at the London Sport Institute
PublisherWiley
JournalScandinavian Journal of Medicine & Science in Sports
ISSN0905-7188
Electronic1600-0838
Publication dates
Online26 Aug 2020
Print14 Oct 2020
Publication process dates
Deposited27 Jul 2020
Submitted06 Dec 2020
Accepted09 Jul 2020
Output statusPublished
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Open
Accepted author manuscript
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Restricted
Copyright Statement

© 2020 The Authors. Scandinavian Journal of Medicine & Science In Sports published by John Wiley & Sons Ltd
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Digital Object Identifier (DOI)https://doi.org/10.1111/sms.13776
Web of Science identifierWOS:000562557200001
LanguageEnglish
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