Introduction Despite the increasing use of low carbohydrates/ketogenic diets (KD) on weight control and management of metabolicsyndrome (Westman et al., 2007) there are paucity of researches about effects of KD diets on sport performances (Phinney et al., 1983a,1983b). KD diets maybe useful in sports with weight class divisions. The aim of our study was to investigate the influence of KD on explosivestrength performance, specifically in elite artistic gymnasts. Methods 8 male subjects (age 20.9 +/- 5.5 yrs) were recruited. Severalphysical and performance tests (body composition analysis, hanging straight leg raise, ground push up, parallel bars push up, pull up,squat jump, countermovement jump, 30 sec continuous jumps) were administered before and after 20 days of KD with support of phytoextract(Tisanoreica Diet; Paoli et al., 2010). During the KD the athletes consumes less than 20g of CHO per day and performed thenormal training program. After three months the same protocol of tests (during a similar training period) was performed before and after20 days of typical mediterranean diet. Results We utilized a repeated-measure t-test. No significant differences were detected betweenKD and Mediterranean diets in Squat Jump, countermovement jump, parallel bars push up and pull up but there are nearly significantincrease during KD in ground push up and hanging straight leg. A more clear significant differences were detected on body composition:after KD there was a decrease of Kg of fat (from 4.95 +/- 1.05 to 3.92 +/- 1.05 p<0.019 and a decrease of fat percentage (from 7.40 +/-1.43 to 5.74 +/- 1.43 p<0.01) with a contextual slightly but non significant increase in muscle mass . Discussion Despite concerns ofcoaches and doctors about the possible detrimental effects of low carbohydrates diets on performances and the well known importanceof carbohydrates on performance (Maughan et al., 1997) there are no data about KD and explosive strength performance. The undeniableand sudden effect of KD on fat loss maybe useful for those athletes who compete in sports based on weight class. We’ve demonstratedthat using KD for a short time period (i.e. 20 days) has no negative effect on explosive strength performance. References MaughanRJ et al., (1997). J Sports Sci, Jun;15(3):265-75. Paoli A et al., (2010). Agro Food Ind Hi Tec July/August 2010;21(4):24-29. Phinney SD et al.,(1983b) Metabolism. Aug;32(8):769-76. Phinney SD et al., (1983a). Metabolism, Aug;32(8):757-68. Westman EC et al., (2007).Am J Clin Nutr,Aug;86(2):276-84.
|Numero di pagine||1|
|Stato di pubblicazione||Published - 2011|