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Predicting the ergogenic response to methylphenidate.

Michael King1,2, Keelyn Van Breda3, Dan J Stein4

  • 1Division of Exercise Science and Sports Medicine, University of Cape Town, Cape Town, South Africa. michaeltcking@me.com.

European Journal of Applied Physiology
|January 27, 2018
PubMed
Summary

Younger age and less physical activity predict a better performance boost from methylphenidate (MPH). This stimulant effect may be linked to dopamine differences, showing individual factors influence MPH's ergogenic response.

Keywords:
Athletic dopingAthletic performanceErgogenic stimulantsRitalin

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Area of Science:

  • Exercise Physiology
  • Pharmacology
  • Human Performance

Background:

  • Stimulants like methylphenidate (MPH) are known to enhance physical performance.
  • Previous research primarily focused on young, active individuals with normal BMI, limiting generalizability.
  • Individual characteristics may influence the ergogenic response to MPH.

Purpose of the Study:

  • To determine if individual factors, specifically physical activity levels, age, and BMI, can predict the ergogenic response to methylphenidate (MPH).
  • To investigate the relationship between habitual physical activity, age, BMI, and MPH-induced improvements in physical performance.

Main Methods:

  • A double-blind, cross-over study involving 29 participants (14 males, 15 females).
  • Participants ingested either MPH or a placebo before performing a handgrip task.
  • Weekly minutes of moderate-to-vigorous physical activity (MVPA), age, and BMI were assessed as predictors of the ergogenic response, measured by the percent change in mean force.

Main Results:

  • Methylphenidate (MPH) significantly increased mean handgrip force by 6.39% compared to placebo.
  • Linear regression analysis revealed that lower weekly minutes of moderate-to-vigorous physical activity (MVPA) and younger age significantly predicted a greater ergogenic response to MPH.
  • Body Mass Index (BMI) did not significantly predict the ergogenic response to MPH.

Conclusions:

  • Lower habitual physical activity and younger age are associated with an enhanced ergogenic response to methylphenidate (MPH).
  • These individual differences in response may be attributable to variations in dopaminergic function.
  • The study highlights that the ergogenic effects of MPH are influenced by individual characteristics such as age and physical activity levels.