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06 May 2015 : Original article  

Effect of Kaempferia parviflora Extract on Physical Fitness of Soccer Players: A Randomized Double-Blind Placebo-Controlled Trial

Kreeta PromthepBEF, Wichai EungpinichpongADE, Bungorn SripanidkulchaiADFG, Uraiwan ChatchawanBC

DOI: 10.12659/MSMBR.894301

Med Sci Monit Basic Res 2015; 21:100-108

Abstract

BACKGROUND: Physical fitness is a fundamental prerequisite for soccer players. Kaempferia parviflora is an herbal plant that has been used in some Asian athletes with the belief that it might prevent fatigue and improve physical fitness. This study aimed to determine the effects of Kaempferia parviflora on the physical fitness of soccer players.

MATERIAL AND METHODS: Sixty soccer players who routinely trained at a sports school participated in a double-blind placebo-controlled trial and were randomly allocated to the treatment group or the placebo group. The participants in both groups were given either 180 mg of Kaempferia parviflora extract in capsules or a placebo once daily for 12 weeks. Baseline data were collected using the following 6 tests of physical performance: a sit-and-reach test, a hand grip strength test, a back-and-leg strength test, a 40-yard technical test, a 50-metre sprint test, and a cardiorespiratory fitness test. All of the tests were performed every 4 weeks throughout the 12-week study period.

RESULTS: The study showed that after treatment with Kaempferia parviflora, the right-hand grip strength was significantly increased at weeks 4, 8, and 12. The left-hand grip strength was significantly increased at week 8. However, the back-and-leg strength, the 40-yard technical test, the sit-and-reach test, the 50-metre sprint test, and the cardiorespiratory fitness test results of the treatment group were not significantly different from those of the placebo group.

CONCLUSIONS: Taking Kaempferia parviflora supplements for 12 weeks may significantly enhance some physical fitness components in soccer players.

Keywords: Alanine Transaminase - blood, Adolescent, Alkaline Phosphatase - blood, Analysis of Variance, Aspartate Aminotransferases - blood, Athletic Performance - physiology, Blood Chemical Analysis, Blood Urea Nitrogen, Body Weights and Measures, Creatinine - blood, Hand Strength - physiology, Physical Fitness - physiology, Plant Extracts - pharmacology, Soccer - physiology, Zingiberaceae - chemistry

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Medical Science Monitor Basic Research eISSN: 2325-4416
Medical Science Monitor Basic Research eISSN: 2325-4416