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Does the Development of the Repeated Bout Effect Depend on Oxidative Stress and Inflammation?

Does the Development of the Repeated Bout Effect Depend on Oxidative Stress and Inflammation?

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07472244
Acronym
ANTI-RBE
Enrollment
52
Registered
2026-03-16
Start date
2025-09-01
Completion date
2027-02-28
Last updated
2026-03-16

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Exercise Recovery

Brief summary

Eccentric exercise, particularly when novel and strenuous, can cause soreness and inflammation, impairing subsequent exercise performance. These performance decrements are attributable to oxidative stress and inflammation. Interestingly, a single bout of eccentric exercise can confer protective effects, ameliorating the negative consequences in subsequent bouts. This is termed the repeated bout effect (RBE), which would be of interest to athletes considering the detrimental effects of strenuous eccentric exercise. Athletes regularly consume supplements in hope of attenuating the performance decrements after strenuous eccentric exercise . However, considering the dose-response relationship between the initial performance decrement and the magnitude of the RBE , supplements may diminish the obtainment of the RBE. This notion remains untested, and so the proposed project is a double-blind, placebo-controlled, parallel group study aiming to assess the effects of acute vitamin C and ibuprofen supplementation on the development of the RBE. These two supplements were chosen as they are most frequently and successfully used in the literature to target oxidative stress (vitamin C) and inflammation (ibuprofen). Additionally, these doses (and the timing of supplements) were chosen to mimic protocols reporting beneficial effects

Interventions

DIETARY_SUPPLEMENTControl

Identical maltodextrin tablet. Appearance and weight matched

DIETARY_SUPPLEMENTIntervention

1,000 mg Vitamin C and 400 mg non-steroidal anti-inflammatory drug every 8-h for 48-h

Sponsors

University of Bath
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)

Intervention model description

The proposed study is a randomised, double blind, placebo controlled, parallel-group study

Eligibility

Sex/Gender
ALL
Age
18 Years to 45 Years
Healthy volunteers
Yes

Inclusion criteria

* 18 - 45 years of age * BMI 18.5 - 29.9 kg/m2 * Able to perform 20-minutes of bench stepping exercise * Capable and willing to provide consent (oral and written)

Exclusion criteria

* Familiarised with bench stepping exercise procedures * Not cleared for exercise by health questionnaires or physical activity readiness questionnaire * Participants exhibiting any alteration in clinical inflammation parameters due to other cause * Participants currently being prescribed any anti-inflammatory medications

Design outcomes

Primary

MeasureTime frameDescription
Muscle FunctionBaseline and post exercise (2 hours, 1 day, 7 day)Jump height calculated through flight time

Secondary

MeasureTime frameDescription
Muscle FunctionBaseline and post exercise (2 hours, 1 day, 7 day)Peak power quantified using a Keiser Leg Press
Creatine KinaseBaseline and immediately, 1-h (hour)-, 2-h-, 24-h-,and 48-hours-post-exercisePlasma Creatine Kinase

Countries

United Kingdom

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Mar 17, 2026