1st. International Conference on Sports and Exercise Science 2009 Bangkok, Thailand 01-03 Disember 2009
Introduction: Athletes in Malaysia need to perfonn in a hot and humid environment due to the climatic nature of the country, Alteration in endurance perfonnance following acute and chronic supplementation of caffeine has been studied in different populations but concurrent research in the Malaysia...
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| Format: | Monograph |
| Language: | English |
| Published: |
Pusat Pengajian Sains Perubatan
2009
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| Subjects: | |
| Online Access: | http://eprints.usm.my/54569/1/DR%20CHEN%20CHEE%20KEONG%20-%20e.pdf http://eprints.usm.my/54569/ |
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| Institution: | Universiti Sains Malaysia |
| Language: | English |
| Summary: | Introduction: Athletes in Malaysia need to perfonn in a hot and humid environment due to the climatic
nature of the country, Alteration in endurance perfonnance following acute and chronic supplementation
of caffeine has been studied in different populations but concurrent research in the Malaysian context has
not been attempted before, Equivocal findings of the ergogenic properties of Panax ginseng in enhancing
physical performance were reported, However, data on the effect of acute supplementation of Panax
ginseng on physical performance among Malaysian population is still lacking. Furthennore, combination
of caffeine and Panax ginseng has never been investigated before on endurance running perfonnance in
the heat. Methods: In the present study, we examined the effect of acute supplementation of 5 mg
caffeine per kg of body weight (C), 200 mg Panax ginseng (PG), combination of 5 mg caffeine per kg of
body weight and 200 mg Panax ginseng (CPG) or placebo (PL) consumed one hour prior to the
endurance performance. Supplements and placebo were given in the fonn of capsules in a randomised
double blind cross-over trial. Nine heat acclimated recreational runners (aged: 25A ± 6.9 years) as well
as nonusers of caffeine (23.7± 12.6 mg per day) participated in this study. Subjects ran at 70% of their
V02m, on a motorised treadmill in a heat-controlled laboratory (31 'C, 70% relative humidity). Subjects
drank 3 mL of cool water per kg of body weight every 20 minutes during the trials to avoid any possible
adverse effects of dehydration. Heart rate, mean skin temperaiure, rectal temperature and RPE were
recorded at intervals of I 0 minutes. Oxygen consumption, fluid sensory scale and blood samples were
collected at intervals of 20 minutes. Results: Running time to exhaustion was significantly longer
(p<0.05) in C trial compared to PL trial. However, the longer time to exhaustion in the CPG trial did not
reach statistical significance (P=0.07). Exhaustion time in PG trial showed no significant difference in
comparison with PL trial. Heart rate, rectal temperatures, mean skin temperature, oxygen uptake, plasma
insulin, glucose, lactate in the C, CPG and PG were not significantly different from the PL trial. Plasma
free fatty acid in the C and CPG trial were significantly higher (p<0.05) in comparison with PL trials.
RPE were lowest in C trial and followed by CPG, PG and PL trials. Heart rate, rectal temperature, mean
skin temperature, oxygen uptake, plasma insulin, glucose, lactate and fatty acid increased significantly
during exercise from their respective resting values in all trials. Gastrointestinal discomfort was not
reported during endurance performance in all trials. Conclusion: Ingestion of 5 mg of caffeine per kg of
body weight has an ergogenic effect on the nonusers of caffeine and heat-acclimatised recreational
runners in a hot and humid environment. |
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