Effects of Caffeine Ingestion on the Biomechanics of Healthy Young Subjects
Condition: Caffeine; Biomechanics; Fatigue; Injuries; Physical Activity
MeSH terms: Fatigue
Study type: Interventional

Summary: 
      Caffeine is one of the few supplements that have enough scientific evidence to state that can
      notably improve performance, as different remarkable organizations in the sports nutrition
      context have classified it as an ergogenic aid with strong evidence regarding its efficacy
      and that is apparently safe. The beneficial effect of this substance on physical and
      cognitive performance has been identified in aerobic and anaerobic efforts, including aerobic
      and muscular endurance, power, or strength.

      However, it seems that the benefits of caffeine are usually measured only by its effect on
      performance, while a comprehensive analysis of its impact on other aspects of the movement
      technique of the exercise is not considered. Therefore, although caffeine generates better
      performance, a null or negative effect may occur on technique execution. As such, some
      consequences might arise (e.g., an increase in injury risk or a decrease in energy
      efficiency).

      The objective of this randomized controlled trial is to assess the influence of caffeine on
      certain biomechanical parameters of the technique of physical exercises in circumstances
      without fatigue and under neuromuscular fatigue. The study hypothesis is that caffeine
      generates modifications in the technical execution of certain movements in fatigued and
      unfatigued circumstances due to its physiological effects, which may be beneficial for
      performance and injury prevention.

      The participants will have to attend 5 sessions (enrollment, familiarization, control,
      placebo, and caffeine), at least 7 days apart. In the last 3 sessions, different measurements
      will be done to their technique while jumping, squatting, and running, without fatigue and
      with it. Other data will be collected throughout the study to contextualize and analyze in
      more detail the obtained information.
    

Detailed description: 
      A detailed description of the study can be found in the protocol uploaded with this registry
      entry.
    

Intervention name(s): Caffeine.; Cellulose.
Intervention type(s): Dietary Supplement; Drug
Intervention description(s): Ingestion of opaque capsules with a total dose of 6mg/kg of caffeine, 60 minutes before the beginning of the assessed exercises. A crossover with the other intervention will be done in the next/previous session (depending on the arm).; Ingestion of opaque capsules with cellulose, 60 minutes before the beginning of the assessed exercises. A crossover with the other intervention will be done in the next/previous session (depending on the arm).
Other intervention name(s): Placebo.
Intervention MeSH terms: Caffeine
Allocation: Randomized
Intervention model: Crossover Assignment
Intervention model description: The assessed sessions, which will be identical, will be the control, the caffeine, and the placebo ones. The last two sessions mentioned will be performed in a randomized order.
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary purpose: Basic Science
Keywords: Ergogenic aids; Kinematics; Kinetics; Neuromuscular fatigue; Acute and chronic injuries; Jump; Squat; Running