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A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology

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The Journal of Sports Medicine and Physical Fitness 2017 Dec 01

DOI: 10.23736/S0022-4707.17.08106-3


language: English

Caffeine, acute static stretching and maximum knee flexion strength

Tyler M. FARNEY 1, 2 , Arnold G. NELSON 2, Joke KOKKONEN 3

1 Department of Health & Kinesiology, Texas A&M University-Kingsville, Kingsville, TX, USA; 2 School of Kinesiology, Louisiana State University, Baton Rouge, LA, USA; 3 Exercise & Sport Science Department, Brigham Young University-Hawaii, Laie, HI, USA


BACKGROUND: Reductions in one repetition maximum lifts (1RM) following static stretching can be attributed to enhanced neural inhibition, which can be reduced by using stimulants like caffeine. This study compared knee-flexion 1RM following either static stretching (SS) or no-stretching (NS), as well as after ingesting either caffeine (C) or placebo (P).
METHODS: Twenty-four participants (12 female, 12 male) performed four random counterbalanced knee flexion 1RM tests. A 1RM test was performed for each condition at the same time of day with ~48 h separating each test. Static stretching consisted of 5 exercises with the 1RM being performed immediately following the stretching. Caffeine dose was 6 mg•kg-1 body weight, and the placebo was methylcellulose (520 mg). Both doses were administered as pills 60 min before the SS or NS procedures.
RESULTS: Two-way repeated measures ANOVA showed a significant main effect for [NS vs. SS] (p <0.001, ηG2 = 0.23). The main effect for [C vs. P], and the interaction between [C vs. P] and [NS vs. SS] were not statistically different. Average (± standard deviation) 1RM (N) were as follows: CNS = 512 ± 242, CSS = 474 ± 241, PNS = 498 ± 247, and PSS = 460 ± 247.
CONCLUSIONS: It is concluded that static stretching induced strength decrements are not removed by using stimulants at doses allowed by sport governing organizations.

KEY WORDS: Flexibility - Muscle strength - 1RM - Neural inhibition - Stimulants

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Publication History

Article first published online: December 01, 2017
Manuscript accepted: November 23, 2017
Manuscript revised: November 6, 2017
Manuscript received: August 29, 2017

Cite this article as

Farney TM, Nelson AG, Kokkonen J. Caffeine, acute static stretching and maximum knee flexion strength. J Sports Med Phys Fitness 2017 Dec 01. DOI: 10.23736/S0022-4707.17.08106-3

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