A comparison of the effects of different forms of caffeine supplementation on 5000-metre running performance

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Authors
Whalley, Peter John Harry
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Degree
Master of Health Science
Grantor
Eastern Institute of Technology (EIT)
Date
2018
Supervisors
Paton, Carl
Dearing, Chey
Type
Masters Thesis
Ngā Upoko Tukutuku (Māori subject headings)
Keyword
caffeine
ergogenic acid
supplements
caffeine gum
caffeine strips
caffeine tablets
running performance
pacing
rate of perceived exertion (RPE)
caffeine urinary metabolites
time trials
ANZSRC Field of Research Code (2020)
Citation
Whalley, P. J. H. (2018). A comparison of the effects of different forms of caffeine supplementation on 5000-metre running performance. (Unpublished document submitted in partial fulfilment of the requirements for the degree of Master of Health Science). Eastern Institute of Technology (EIT), New Zealand. https://hdl.handle.net/10652/6045
Abstract
BACKGROUND Caffeine is a well established ergogenic aid to enhance sporting performance, and there is a variety of commercially available caffeine supplements. However, there is limited research investigating caffeine effects on running performance and comparing different forms of caffeine supplementation. AIM The purpose of this research was to compare how a moderate dose of caffeine (3- 4.5mg.kg⁻¹ of body mass), administered acutely and in three different supplementation forms (caffeine gum, tablets, and strips), affected 5000-metre track running performance. METHOD Using a randomised, placebo-controlled, crossover design, 10 males (mean ± SD, age 40 ± 9 years, body mass 73.4 ± 10.1kg, height 180.6 ± 10.2cm), and 4 females (age 40.7 ± 8.8 years, height 166.7 ± 6.8cm, body mass 58.5 ± 2kg), completed five x 5000-metre time trials. Trials were conducted at a self-paced maximal effort and took place on an outdoor 400-metre athletics track. Trials were spread over a 9-week period, separated by no less than 3 days and a maximum of 28 days. After conducting a familiarisation, participants ingested a single dose of caffeine (200mg for body mass <65kg or 300mg for body mass >65kg), 10-15 minutes before each trial, in the form of either caffeine chewing gum (CG), caffeine strips (CS), caffeine tablets (CT), or placebo (P). Performance and physiological measurements collected were total time, 800-metre lap pace, heart rate (HR) and rate of perceived exertion (RPE). On completion of each time trial, participants also provided a urine sample for analysis of caffeine and paraxanthine metabolites. RESULTS In comparison with P, caffeine supplementation improved running performance for CT = 2.0% ± 1.1%, CG= 0.9 ± 1.4% and CS= 1.2 ± 1.0 % (95% CL), with only CT significant (p=0.02). Overall pace trended faster in all caffeine trials compared with P and was significant in CT at 2600m-3400m (p=0.013) and 3400m-4200m (p=0.015). Acute caffeine supplementation did not affect HR or RPE. There was no relationship between the urinary concentration content of caffeine, paraxanthine, and associated metabolic ratio and running performance. CONCLUSION This study concludes that 3-4.5mg kg⁻¹ body mass of caffeine, consumed 10-15 minutes before exercise, can produce small yet significant improvements in 5000-metre running performance when taken in tablet form. However, why this only occurred in the tablet supplement is unclear and requires additional research.
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