Creatine Supplement In Thai Elite Swimmers
Mahidol University Annual Research Abstracts 330 Institute of Nutrition 1Nutritional Physiology Division, 2Biostatistics and Computer Services Division, 3Human Nutrition Division, , Institute of Nutrition, 4Faculty of Graduate Studies, Mahidol University at Salaya, Nakhon Pathom 73170, Thailand.
Key words : physical fitness, blood pressure, nutritional status The Bangkok Metropolitan Area (BMA) is an expansive, fast-paced city with notorious traffic jams and significant air pollution. Children lead a city lifestyle like that of their working parents. In contrast children of Supanburee although it is a city near Bangkok, seem to have a less hectic lifestyle and have more access to outdoors play fields and opportunity for physical activity. As part of the Nutrifit program which was carried out in 4 schools in the BMA and in Supanburee (S) province, we compared schoolboys aged 8-9 years old in city (BMA) to boys in a smaller province (S) in terms of anthropometry, blood pressure, physical activity and performance.
236 and 130 schoolboys were recruited in BMA and Supanburee. By using Thai standard growth curve, 126 boys were classified as normal (P10- P90), and 105 boys were classified as over weight and obese (>P90) in BMA. In Supanburee 91 boys were classified as normal and 25 boys were classified as overweight and obese. Some subjects were excluded from the study due to their status of under-nutrition (10), ie.
, 5 boys in BMA and 14 boys in Supanburee. Health Related Fitness (HRF) using Fitnessgram, blood pressure, physical activity level (by grouping non-organized sports in the past month) and the time spent watching TV were recorded. The data was analyzed using the Mann-Whitney test for the statistical analysis. The results demonstrated that for the normal group, Supanburee boys performed the HRF test better than BMA boys, namely: 1 mile walk/run, push ups and flexibility (p (Presented at the 17th International Congress of Nutrition, August 27-31, 2001 Vienna, Austria.
) Creatine supplement in Thai elite swimmers (NO. 865) Kallaya Kijboonchoo1,2, Charintip Khongsakpornchai1, Rungchai Chuanchaiyakul3, Wiyada Thassanasuwan1 and Thyon Chintanez3 1Nutritional Physiology Division, Institute of Nutrition, 2Faculty of Graduate Studies, Mahidol University at Salaya, Nakhon Pathom 73170, 3Department of Exercise Science, Faculty of Science, Mahidol University, Bangkok 10400, Thailand. Key words : creatine supplement, performance, athlete Objective: To investigate the effect of creatine supplementation on swimming performance in elite swimmers both in the laboratory and field test. Methods: A study was conducted prior to the Sydney Olympic Games 2000.
Fifteen elite male and female swimmers (including 2 female and 2 male Olympic swimmers) were recruited. A double-blind cross- over study was carried out as creatine group (4x 5 gm creatine monohydrate / d) and placebo group (4x 5 gm maltodextrin / d) for 7 days with a 5 wk wash out period in between. Results: The combined results of creatine group and placebo group demonstrated that body weight was found to significantly increase in the creatine group and only fat mass using Bioelectrical Impedance Assay was increased in the placebo group. Anaerobic power and capacity for leg performance using the Wingate test was increased in the creatine group, but not for arm performance.
In the 50 meter-swimming pool, the force transducers attached to both ends of the pool which measured the initial force, velocity, and the time to complete a 50- meter lap, demonstrated no advantage in the creatine group. In contrast, the reaction time which represented the time taken after the start gun was fired and the force transducer was activated, was found to be less in the placebo group, but there was no difference in the 50- meter swimming time. Moreover, the analysis for gender difference revealed that the initial velocity (force divided by distance) was significantly increase in males, but not in females; whereas the anaerobic capacity was increased in females only. Conclusion: Though the anaerobic power and capacity were found to increase in the laboratory, swimming performance for the creatine supplement group was not enhanced.
Hence, no absolute conclusive evidence was found for the benefit of creatine supplementation in Thai elite swimmers. (Presented at the 17th International Congress of Nutrition, August 27-31, 2001 Vienna, Austria) EFFECT OF EXERCISE ON FRUCTOSE ABSORP-TION FACILITATED BY ALANINE AND PHY-SICAL PERFORMANCE (NO. 866) Jeeranun Suwanwaree1, Kraisid Tontisirin1, Kallaya Kijboonchoo1 and Chaivat Toskulkao2 1Nutritional Physiology Division, Institute of Nutrition, Mahidol University at Salaya, Nakhon Pathom 73170, 2Sports Authority of Thailand, Bangkok 10240, Thailand. Key words : fructose/glucose/breath hydrogen test/alanine/absorption/physical performance Ingestion of water and/or beverage both before and during competition or training is important for athletes and their performance.
Fructose is a carbohydrate that creates less insulin responses than glucose but is less absorbed in the intestine than glucose. The facilitating effect of alanine on fructose absorption in healthy children is shown in resting condition but there is no report about fructose absorption with facilitating effect of alanine in exercise conditions. Therefore, this study aimed to investigate the effect of exercise on fructose absorption facilitated by alanine and physical performance using a double blind randomized design. Eight physically active college students (VO2 max = 51.
782.04 ml/kg/min), were engaged in the experiment in four trials i.e., 6% glucose (G), 6% fructose (F), 6% fructose and half-equimolar alanine (Fa), or 6% fructose and equimolar alanine (FA).
Five hundred milliliters of beverage was given at 45 min before exercise and 350 ml immediately prior to exercise. Total fructose/glucose intake was 51 g in each trial. Osmolality of the beverages were 4136.56, 4383.
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