Abstract
The effects of 4 mg·kg-1 caffeine 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, was 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 signif...Continue Reading
References
Jan 1, 1992·European Journal of Clinical Pharmacology·J D LaneC M Kuhn
Jun 1, 1985·Contraception·H KuhlH D Taubert
Jan 1, 1984·European Journal of Clinical Pharmacology·E C RietveldJ M van Rossum
May 1, 1993·Clinical Pharmacology and Therapeutics·W Kalow, B K Tang
Feb 6, 1998·Journal of Applied Physiology·V Strojnik, P V Komi
Jan 4, 2001·The Journal of Physiology·X A Janse de JongeM W Thompson
Jul 10, 2003·Clinical Science·K J ElliottM J Diver
Mar 19, 2005·Scandinavian Journal of Medicine & Science in Sports·M Doherty, P M Smith
May 10, 2005·Journal of Applied Physiology·B M Meyers, E Cafarelli
Aug 19, 2007·Behavior Research Methods·Franz FaulAxel Buchner
Sep 14, 2007·European Journal of Applied Physiology·Todd A AstorinoKelli Firth
Nov 18, 2008·Psychopharmacology·Merideth A AddicottPaul J Laurienti
Dec 18, 2008·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Mark A Tarnopolsky
Dec 19, 2009·Medicine and Science in Sports and Exercise·Gordon L WarrenMelinda L Millard-Stafford
May 18, 2010·Journal of the International Society of Sports Nutrition·Erica GoldsteinJose Antonio
Dec 16, 2010·Journal of Strength and Conditioning Research·Michael J Duncan, Samuel W Oxford
Aug 23, 2011·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Juan Del CosoJesús Muñoz-Guerra
Feb 23, 2013·Journal of Applied Physiology·Jacques Duchateau, Stéphane Baudry
Jul 17, 2014·Journal of Strength and Conditioning Research·Michael A TrevinoMoh H Malek
Sep 12, 2014·Medicine and Science in Sports and Exercise·Christopher D BlackAlexander R Gonglach
May 15, 2015·Scientific Reports·Martin BehrensSven Bruhn
Aug 8, 2015·International Journal of Sports Medicine·H-Y ChenH-H Chao
Nov 20, 2016·Biomedical Chromatography : BMC·Feng ChenS Casey Laizure
Dec 17, 2016·Journal of the International Society of Sports Nutrition·Ajmol AliKay Rutherfurd-Markwick
Apr 8, 2017·Journal of Clinical and Diagnostic Research : JCDR·L C PallaviG Shivaprakash
May 13, 2017·Journal of Applied Physiology·Lívia de Souza GonçalvesBruno Gualano
Nov 1, 2017·European Journal of Sport Science·Jozo Grgic
Mar 13, 2018·Journal of the International Society of Sports Nutrition·Jozo GrgicZeljko Pedisic
Feb 16, 2019·The Journal of Physiology·Alessandro Del VecchioDario Farina
Mar 8, 2019·Journal of Applied Physiology·Paul AnsdellStuart Goodall
Mar 31, 2019·British Journal of Sports Medicine·Jozo GrgicZeljko Pedisic
Apr 13, 2019·Sports Medicine·Craig Pickering, Jozo Grgic
Jul 18, 2019·Nutrients·Juan José SalineroJuan Del Coso
Aug 25, 2019·Nutrients·Michal WilkJuan Del Coso
Nov 7, 2019·Nutrients·Blanca Romero-MoraledaBeatriz Lara
Mar 4, 2020·Sports Medicine·Vitor De Salles PainelliFlávio Oliveira Pires
Mar 4, 2020·Sports Medicine·Craig Pickering, Jozo Grgic