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The effects of a caffeine-like supplement, TeaCrine®, on muscular strength, endurance and power performance in resistance-trained men.
J Int Soc Sports Nutr. 2019 Oct 28; 16(1):47.JI

Abstract

BACKGROUND

TeaCrine® is the synthetic version to naturally occurring theacrine (1, 3, 7, 9-tetramethyluric acid) found in the leaves of Camellia kucha tea plants. A few studies have examined the effects of TeaCrine® on cognitive perception, but no research exists examining its effects on resistance exercise performance. The purpose of this study was to determine the efficacy of TeaCrine®, a caffeine-like compound, on maximal muscular strength, endurance, and power performance in resistance-trained men.

METHODS

Twelve resistance-trained men participated in a randomized, double-blind, cross-over designed study. Each participant performed one-repetition maximum (1RM) bench press, 1RM squat, bench press repetitions to failure (RTF) at 70% 1RM, squat RTF at 70% 1RM, and 2-km rowing time trial 90 min after consumption of: (1) Caffeine 300 mg (CAFF300); (2) TeaCrine® 300 mg (TEA300); (3) TeaCrine® + Caffeine (COMBO; 150 mg/150 mg); (4) Placebo 300 mg (PLA). Power and velocity were measured using a TENDO Power Analyzer. Visual analogue scales for energy, focus, motivation to exercise, and fatigue were administered at baseline and 90 min post-treatment ingestion (pre-workout). Rating of perceived exertion was assessed after bench press RTF and squat RTF.

RESULTS

There were no differences between groups for 1RM, RTF, and power in the bench press and squat exercises. Only CAFF300 resulted in significant increases in perceived energy and motivation to exercise vs. TEA300 and PLA (Energy: + 9.8%, 95% confidence interval [3.3-16.4%], p < 0.01; + 15.3%, 95% CI [2.2-28.5%], p < 0.02; Motivation to exercise: + 8.9%, 95% CI [0.2-17.6%], p = 0.04, + 14.8%, 95% CI [4.7-24.8%], p < 0.01, respectively) and increased focus (+ 9.6%, 95% CI [2.1-17.1%], p = 0.01) vs. TEA300, but there were no significant differences between CAFF300 and COMBO (Energy + 3.9% [- 6.9-14.7%], Focus + 2.5% [- 6.3-11.3%], Motivation to exercise + 0.5% [- 11.6-12.6%]; p > 0.05).

CONCLUSION

Neither TEA300, CAFF300, COMBO, or PLA (when consumed 90 min pre-exercise) improved muscular strength, power, or endurance performance in resistance-trained men. Only CAFF300 improved measures of focus, energy, and motivation to exercise.

Links

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Authors+Show Affiliations

Cesareo KR
Department of Nutrition, Food & Exercise Sciences, Institute of Sports Sciences & Medicine, Florida State University, 1104 Spirit Way, Tallahassee, FL, 32306, USA. The Center for Applied Health Sciences, Canfield, OH, 44515, USA.
Mason JR
Department of Nutrition, Food & Exercise Sciences, Institute of Sports Sciences & Medicine, Florida State University, 1104 Spirit Way, Tallahassee, FL, 32306, USA. Deparment of Occupational Therapy, University of Florida, Gainesville, FL, 32611, USA.
Saracino PG
Department of Nutrition, Food & Exercise Sciences, Institute of Sports Sciences & Medicine, Florida State University, 1104 Spirit Way, Tallahassee, FL, 32306, USA.
Morrissey MC
Department of Nutrition, Food & Exercise Sciences, Institute of Sports Sciences & Medicine, Florida State University, 1104 Spirit Way, Tallahassee, FL, 32306, USA. Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT, 60268, USA.
Ormsbee MJ
Department of Nutrition, Food & Exercise Sciences, Institute of Sports Sciences & Medicine, Florida State University, 1104 Spirit Way, Tallahassee, FL, 32306, USA. mormsbee@fsu.edu. Discipline of Biokinetics, Exercise and Leisure Sciences, University of KwaZulu-Natal, Durban, South Africa. mormsbee@fsu.edu.

MeSH

AdultCaffeineCross-Over StudiesDouble-Blind MethodHumansMaleMuscle StrengthMuscle, SkeletalPerformance-Enhancing SubstancesPhysical EnduranceResistance TrainingUric AcidYoung Adult

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

31660991

Citation

Cesareo, Kyle R., et al. "The Effects of a Caffeine-like Supplement, TeaCrine®, On Muscular Strength, Endurance and Power Performance in Resistance-trained Men." Journal of the International Society of Sports Nutrition, vol. 16, no. 1, 2019, p. 47.
Cesareo KR, Mason JR, Saracino PG, et al. The effects of a caffeine-like supplement, TeaCrine®, on muscular strength, endurance and power performance in resistance-trained men. J Int Soc Sports Nutr. 2019;16(1):47.
Cesareo, K. R., Mason, J. R., Saracino, P. G., Morrissey, M. C., & Ormsbee, M. J. (2019). The effects of a caffeine-like supplement, TeaCrine®, on muscular strength, endurance and power performance in resistance-trained men. Journal of the International Society of Sports Nutrition, 16(1), 47. https://doi.org/10.1186/s12970-019-0316-5
Cesareo KR, et al. The Effects of a Caffeine-like Supplement, TeaCrine®, On Muscular Strength, Endurance and Power Performance in Resistance-trained Men. J Int Soc Sports Nutr. 2019 Oct 28;16(1):47. PubMed PMID: 31660991.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of a caffeine-like supplement, TeaCrine®, on muscular strength, endurance and power performance in resistance-trained men. AU - Cesareo,Kyle R, AU - Mason,Justin R, AU - Saracino,Patrick G, AU - Morrissey,Margaret C, AU - Ormsbee,Michael J, Y1 - 2019/10/28/ PY - 2019/05/21/received PY - 2019/10/03/accepted PY - 2019/10/30/entrez PY - 2019/10/30/pubmed PY - 2020/1/16/medline KW - Bench press KW - Caffeine KW - Endurance KW - Ergogenic KW - Power KW - Squat KW - Strength KW - Supplements KW - TeaCrine® SP - 47 EP - 47 JF - Journal of the International Society of Sports Nutrition JO - J Int Soc Sports Nutr VL - 16 IS - 1 N2 - BACKGROUND: TeaCrine® is the synthetic version to naturally occurring theacrine (1, 3, 7, 9-tetramethyluric acid) found in the leaves of Camellia kucha tea plants. A few studies have examined the effects of TeaCrine® on cognitive perception, but no research exists examining its effects on resistance exercise performance. The purpose of this study was to determine the efficacy of TeaCrine®, a caffeine-like compound, on maximal muscular strength, endurance, and power performance in resistance-trained men. METHODS: Twelve resistance-trained men participated in a randomized, double-blind, cross-over designed study. Each participant performed one-repetition maximum (1RM) bench press, 1RM squat, bench press repetitions to failure (RTF) at 70% 1RM, squat RTF at 70% 1RM, and 2-km rowing time trial 90 min after consumption of: (1) Caffeine 300 mg (CAFF300); (2) TeaCrine® 300 mg (TEA300); (3) TeaCrine® + Caffeine (COMBO; 150 mg/150 mg); (4) Placebo 300 mg (PLA). Power and velocity were measured using a TENDO Power Analyzer. Visual analogue scales for energy, focus, motivation to exercise, and fatigue were administered at baseline and 90 min post-treatment ingestion (pre-workout). Rating of perceived exertion was assessed after bench press RTF and squat RTF. RESULTS: There were no differences between groups for 1RM, RTF, and power in the bench press and squat exercises. Only CAFF300 resulted in significant increases in perceived energy and motivation to exercise vs. TEA300 and PLA (Energy: + 9.8%, 95% confidence interval [3.3-16.4%], p < 0.01; + 15.3%, 95% CI [2.2-28.5%], p < 0.02; Motivation to exercise: + 8.9%, 95% CI [0.2-17.6%], p = 0.04, + 14.8%, 95% CI [4.7-24.8%], p < 0.01, respectively) and increased focus (+ 9.6%, 95% CI [2.1-17.1%], p = 0.01) vs. TEA300, but there were no significant differences between CAFF300 and COMBO (Energy + 3.9% [- 6.9-14.7%], Focus + 2.5% [- 6.3-11.3%], Motivation to exercise + 0.5% [- 11.6-12.6%]; p > 0.05). CONCLUSION: Neither TEA300, CAFF300, COMBO, or PLA (when consumed 90 min pre-exercise) improved muscular strength, power, or endurance performance in resistance-trained men. Only CAFF300 improved measures of focus, energy, and motivation to exercise. SN - 1550-2783 UR - https://www.unboundmedicine.com/medline/citation/31660991/The_effects_of_a_caffeine_like_supplement_TeaCrine®_on_muscular_strength_endurance_and_power_performance_in_resistance_trained_men_ DB - PRIME DP - Unbound Medicine ER -