Does a Caffeine Gum Improve 5 km Run Performance in a Competition/Field Setting?

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

36 participants

Study Classification

INTERVENTIONAL

Study Start Date

2015-06-30

Study Completion Date

2016-01-31

Brief Summary

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The purpose of this study is to determine whether caffeine gum improves the performance of runners completing free timed mass participation 5 km runs in the United Kingdom (UK)

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Detailed Description

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The study will investigate the ability of an acute intake of caffeine gum to improve performance in recreationally trained runners completing park runs. Park runs are free, timed 5 km mass participation running events that are held in a number of parks around the UK every Saturday morning.

A total of 60 recreationally trained runners will be recruited to the study. Of these, 30 will be assigned to a randomised placebo-controlled double-blind cross-over trial. The remaining 30 will be assigned to a non-intervention comparison group. The non-intervention group will be used to account for the effect of changing environmental conditions on running performance.

All participants will complete two 5 km park runs separated by no more than 2 weeks. Participants on the intervention study arms will consume either caffeine or placebo gum 30 minutes before they run. The order of consumption will be randomised. The caffeine gum will contain 300 mg (with an approximate 85% bioavailability). Participants will be asked to abstain from any caffeine containing beverages or food for 18 hours before each run. They will also be asked to record their dietary intake for the day before and the morning of the run and to repeat this for their second trial. Physical activity on the days leading up to each 5 km run will also be recorded and participants will be asked to closely replicate their activity in the week leading up to each trial. They will also be asked to keep training intensity and duration light during the 48 hours leading up to each trial.

The primary outcome measure will be change in overall time for the 5 km runs. Other outcome measures will be ratings of perceived exertion, 1 km split times and average heart rate.

The study size was calculated using an online software package (http://www.sportsci.org/resource/stats/), adopting a power of 80% and an alpha of 0.05. Using within-person standard deviation from runners completing a local parkrun and an expected effect size of 1.2% (Bridge and Jones (2006) J Sports Sciences. 24(4):433-9) a sample size of 25 runners was calculated for the intervention study.

Conditions

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Running Performance

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Blinding Strategy

TRIPLE

Participants Investigators Outcome Assessors

Study Groups

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Caffeine gum

caffeine (300 mg) in gum form x 1 ingestion

Group Type EXPERIMENTAL

caffeine gum

Intervention Type DIETARY_SUPPLEMENT

Gum is consumed 30 minutes before commencement of run

Placebo gum

placebo gum consumed x 1 ingestion

Group Type PLACEBO_COMPARATOR

placebo gum

Intervention Type DIETARY_SUPPLEMENT

Gum is consumed 30 minutes before commencement of run

Non-intervention group

A third group of runners will be used to adjust for changes in environmental conditions. They will complete 2 runs without consuming either placebo or experimental treatment

Group Type NO_INTERVENTION

No interventions assigned to this group

Interventions

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caffeine gum

Gum is consumed 30 minutes before commencement of run

Intervention Type DIETARY_SUPPLEMENT

placebo gum

Gum is consumed 30 minutes before commencement of run

Intervention Type DIETARY_SUPPLEMENT

Eligibility Criteria

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Inclusion Criteria

* Healthy adult runners with evidence of having recently ran 5 km in under 25 minutes

Exclusion Criteria

* Current musculoskeletal injury, history of adverse response to caffeine, presence or history of cardiovascular disease, heart rhythm disorders or hypertension.

Minimum Eligible Age

18 Years

Maximum Eligible Age

65 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes