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7-Day Caffeine and Upper-Body Power in Active Women

NCT07771556 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 30

Last updated 2026-08-18

No results posted yet for this study

Summary

This study investigated the effects of a 7-day caffeine supplementation on heart rate variability, cognitive performance, and upper-body anaerobic power in active women. Thirty healthy active women aged 25-30 years participated in this double-blind, placebo-controlled trial. Participants were randomly assigned to receive either 5 mg/kg of caffeine or a placebo daily for 7 days. Heart rate variability, cognitive function (measured by the Stroop test), and upper-body anaerobic power (measured by a 20-second Wingate test) were assessed at baseline, 90 minutes after supplementation, and 30 minutes after exercise. The primary outcome was peak anaerobic power. The study aimed to determine whether short-term caffeine habituation enhances exercise performance without altering cardiac autonomic function or cognitive performance.

Conditions

  • Caffeine
  • Exercise
  • Physical Fitness

Interventions

DIETARY_SUPPLEMENT

Caffeine

5 mg/kg of body weight of caffeine powder in a gelatin capsule, ingested daily for 7 days.

DIETARY_SUPPLEMENT

Placebo

Matching placebo capsule containing flour, ingested daily for 7 days.

Sponsors & Collaborators

  • Birjand University of Medical Sciences

    lead OTHER

Principal Investigators

  • Mohsen Ahmadi Mohammadnia, PhD · university of birjand

Study Design

Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
30 Years
Sex
FEMALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2020-01-01
Primary Completion
2020-07-01
Completion
2020-09-01

Countries

  • Iran

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07771556 on ClinicalTrials.gov