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The acute effect of a caffeine-containing energy drink on mood state, readiness to invest effort, and resistance exercise to failure.
J Strength Cond Res. 2012 Oct; 26(10):2858-65.JS

Abstract

The efficacy of caffeine ingestion in enhancing aerobic performance is well established. The evidence for caffeine's effects on resistance exercise is mixed and has not fully examined the associated psychological and psychophysiological changes. This study examined acute effects of ingesting a caffeine-containing energy drink on repetitions to failure, the rating of perceived exertion (RPE), and the readiness to invest physical effort (RTIPE) and mental effort during resistance exercise to failure. Thirteen resistance-trained men took part in this double-blind, randomized cross-over experimental study whereby they ingested a caffeinated (179 mg) energy drink or placebo solution 60 minutes before completing a bout of resistance exercise comprising bench press, deadlift, prone row, and back squat exercise to failure at an intensity of 60% 1-repetition maximum. Experimental conditions were separated by at least 48 hours. Participants completed significantly greater repetitions to failure, irrespective of exercise, in the energy drink condition (p = 0.015). Rating of perceived exertion was significantly higher in the placebo condition (p = 0.02) and was significantly higher during lower-body exercises compared with upper-body exercises irrespective of the substance ingested (p = 0.0001). Readiness to invest mental effort was greater with the energy drink condition (p = 0.04), irrespective of time. A significant time × substance interaction (p = 0.036) for RTIPE indicated that RTIPE increased for both placebo and energy drink conditions preingestion to pre-exercise, but the magnitude of increase was greater with the energy drink condition compared with placebo. This resulted in higher RTIPE postexercise for the energy drink condition. These results suggest that acute ingestion of a caffeine-containing energy drink can enhance resistance exercise performance to failure and positively enhance psychophysiological factors related to exertion in trained men.

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Authors+Show Affiliations

Duncan MJ
Department of Biomolecular and Sports Sciences, Coventry University, Coventry, United Kingdom. michael.duncan@coventry.ac.uk
Smith M
No affiliation info available
Cook K
No affiliation info available
James RS
No affiliation info available

MeSH

AdolescentAdultAffectAthletic PerformanceCaffeineCentral Nervous System StimulantsCross-Over StudiesDouble-Blind MethodEnergy DrinksHumansMalePhysical EnduranceResistance TrainingWeight LiftingYoung Adult

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

22124354

Citation

Duncan, Michael J., et al. "The Acute Effect of a Caffeine-containing Energy Drink On Mood State, Readiness to Invest Effort, and Resistance Exercise to Failure." Journal of Strength and Conditioning Research, vol. 26, no. 10, 2012, pp. 2858-65.
Duncan MJ, Smith M, Cook K, et al. The acute effect of a caffeine-containing energy drink on mood state, readiness to invest effort, and resistance exercise to failure. J Strength Cond Res. 2012;26(10):2858-65.
Duncan, M. J., Smith, M., Cook, K., & James, R. S. (2012). The acute effect of a caffeine-containing energy drink on mood state, readiness to invest effort, and resistance exercise to failure. Journal of Strength and Conditioning Research, 26(10), 2858-65.
Duncan MJ, et al. The Acute Effect of a Caffeine-containing Energy Drink On Mood State, Readiness to Invest Effort, and Resistance Exercise to Failure. J Strength Cond Res. 2012;26(10):2858-65. PubMed PMID: 22124354.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The acute effect of a caffeine-containing energy drink on mood state, readiness to invest effort, and resistance exercise to failure. AU - Duncan,Michael J, AU - Smith,Mike, AU - Cook,Kathryn, AU - James,Rob S, PY - 2011/11/30/entrez PY - 2011/11/30/pubmed PY - 2013/3/5/medline SP - 2858 EP - 65 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 26 IS - 10 N2 - The efficacy of caffeine ingestion in enhancing aerobic performance is well established. The evidence for caffeine's effects on resistance exercise is mixed and has not fully examined the associated psychological and psychophysiological changes. This study examined acute effects of ingesting a caffeine-containing energy drink on repetitions to failure, the rating of perceived exertion (RPE), and the readiness to invest physical effort (RTIPE) and mental effort during resistance exercise to failure. Thirteen resistance-trained men took part in this double-blind, randomized cross-over experimental study whereby they ingested a caffeinated (179 mg) energy drink or placebo solution 60 minutes before completing a bout of resistance exercise comprising bench press, deadlift, prone row, and back squat exercise to failure at an intensity of 60% 1-repetition maximum. Experimental conditions were separated by at least 48 hours. Participants completed significantly greater repetitions to failure, irrespective of exercise, in the energy drink condition (p = 0.015). Rating of perceived exertion was significantly higher in the placebo condition (p = 0.02) and was significantly higher during lower-body exercises compared with upper-body exercises irrespective of the substance ingested (p = 0.0001). Readiness to invest mental effort was greater with the energy drink condition (p = 0.04), irrespective of time. A significant time × substance interaction (p = 0.036) for RTIPE indicated that RTIPE increased for both placebo and energy drink conditions preingestion to pre-exercise, but the magnitude of increase was greater with the energy drink condition compared with placebo. This resulted in higher RTIPE postexercise for the energy drink condition. These results suggest that acute ingestion of a caffeine-containing energy drink can enhance resistance exercise performance to failure and positively enhance psychophysiological factors related to exertion in trained men. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/22124354/The_acute_effect_of_a_caffeine_containing_energy_drink_on_mood_state_readiness_to_invest_effort_and_resistance_exercise_to_failure_ L2 - https://doi.org/10.1519/JSC.0b013e318241e124 DB - PRIME DP - Unbound Medicine ER -