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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Nutritional Biochemistry

Background:

  • Static stretching (SS) can decrease maximal strength, potentially due to neural inhibition.
  • Caffeine is known to potentially mitigate strength reductions caused by neural inhibition.

Purpose of the Study:

  • To investigate if caffeine ingestion can attenuate the strength decrements associated with static stretching.
  • To compare one-repetition maximum (1RM) knee flexion strength following static stretching (SS) versus no stretching (NS), with and without caffeine (C) or placebo (P) ingestion.

Main Methods:

  • Twenty-four healthy participants (12 male, 12 female) completed four randomized, counterbalanced 1RM knee flexion tests.
  • Participants ingested either 6 mg/kg body weight of caffeine or a placebo (methylcellulose) 60 minutes prior to either SS or NS protocols.
  • Static stretching involved 5 exercises, with the 1RM test performed immediately after the stretching protocol.

Main Results:

  • A significant main effect was observed for static stretching, showing reduced 1RM strength compared to no stretching (P<0.001, ηG2=0.23).
  • No statistically significant main effect was found for caffeine versus placebo.
  • The interaction between stretching conditions and caffeine/placebo was not statistically significant, indicating caffeine did not alter the stretching-induced strength reduction.

Conclusions:

  • Static stretching leads to significant decrements in one-repetition maximum strength.
  • Caffeine ingestion, at doses permitted by sports governing bodies, does not effectively counteract the strength reductions induced by static stretching.