Motivational, Affective and Performance Effects of Caffeine Supplementation

Summary

The main objective of the study is to evaluate the influence of caffeine intake on participants' energetic arousal, affect, motivation to achieve a training goal, satisfaction with training, and the sense of agency during training. Consequently, participants will engage in three sessions: caffeine, placebo, and no substance (in counterbalanced order). During each session, their affective and motivational states will be assessed, along with the performance of a standardized physical exercise test. The investigators hypothesize that participants who consume caffeine (caffeine condition) will exhibit higher levels of energy and motivation compared to the other two groups. Additionally, they are expected to experience greater optimism and expectancy regarding their training goals and achieve better results in the physical exercise test.

A secondary aim of the study is to examine the impact of genetic variability on motivational and affective states of participants, as well as their performance in the physical exercise test after caffeine. The investigators will assess the CYP1A2 (-163C \> A, rs762551; characterized such as "fast" (AA genotype) and "slow" caffeine metabolizers (C-carriers)) and ADORA2A (1976T \> C; rs5751876; characterized by "high" (TT genotype) or "low" sensitivity to caffeine (C-carriers)).

Conditions

• Caffeine
• Affect
• Goals

Interventions

DIETARY_SUPPLEMENT

Caffeine

Participants will take one caffeine pill. The dose of caffeine will be calculated based on participants' body mass (3mg/kg body mass). Caffeine will be provided in capsules containing the individual amount of caffeine and will be administered orally 60 min before the onset of the exercise protocol.

DIETARY_SUPPLEMENT

Placebo

Participants will take one pill with no caffeine in it. The manufacturer of the caffeine capsules will also prepare identical placebo capsules filled out with a microcrystalline cellulose. Placebo will be administered orally 60 min before the onset of the exercise protocol.

OTHER

No substance

Participants will take no substance. They will just wait 60 minutes and then engage in the exercise protocol.

Sponsors & Collaborators

• The Jerzy Kukuczka Academy of Physical Education in Katowice

  collaborator OTHER

• University School of Physical Education, Krakow, Poland

  collaborator OTHER

• Jagiellonian University

  lead OTHER

Principal Investigators

• Ewa Szumowska · Jagiellonian University

Study Design

Allocation

RANDOMIZED

Purpose

BASIC_SCIENCE

Masking

TRIPLE

Model

CROSSOVER

Eligibility

Min Age

18 Years

Max Age

30 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2024-01-19

Primary Completion

2024-05-01

Completion

2024-05-01

Countries

• Poland

Study Locations