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An Intracellular Water Reduction Before A Competition Decreases Upper-body Power Output In Elite Judo Athletes: 1434Board #36 May 27 9:30 AM - 11:00 AM

Silva, Analiza M.; Matias, Catarina; Quitério, Ana L.; Oliveira, Susana; Santos, Diana; Valamatos, Maria J.; Sardinha, Luís B.

Medicine & Science in Sports & Exercise: May 2009 - Volume 41 - Issue 5 - p 12-13
doi: 10.1249/01.MSS.0000354599.87548.95
A-24 Free Communication/Poster - Body Composition: MAY 27, 2009 7:30 AM - 12:30 PM ROOM Hall 4F

Faculty of Human Movement, Lisbon, Portugal.

(No relationships reported)

PURPOSE: To analyze the effect of body composition changes, from a period of weight maintenance to before a competition (nearly 1-month apart), on upper-body power output (PO) in male judo athletes.

METHODS: A total of 23 men, top-level athletes (age: 22.8±2.7 yrs), were evaluated at baseline [weight. 73.0±7.3 kg; percent fat mass (%FM): 11.7±2.4 %] and before a competition (Weight: 72.0±7.2 kg; %FM: 11.2±2.3 %). Before the competition some of these athletes lost weight through self-determined means while others remained or increased their weight. A 7-day recall of dietary food intake was recorded at baseline and before the competition. At both moments, and after an overnight fasting, total body water (TBW), extracellular (ECW), and intracellular water (ICW) were estimated by bioelectrical impedance spectroscopy while FM, fat-free mass (FFM), lean soft tissue (LST), and arms LST were assessed by dual-energy x-ray absoptiometry (DXA). At baseline, a power-load spectrum was used to assess upper-body PO in a bench-press position while, before the competition, and after a standardized warm-up, only the individual load where the peak PO value was obtained at baseline was used to assess PO changes. Changes are expressed as a percentage of the baseline value; comparisons of means, bivariate and partial correlations were used.

RESULTS: A significant mean reduction (p<0.05) in weight was observed [-1.3±2.5 %, -6.2 to 2.8 % (mean ± SD, range)] while no significant mean changes were found in FM (-4.3±10.1 %,-21.9 to 14.0 %), FFM (-0.8±2.3, -5.4 to 3.1 %), LST (-0.9±2.5 %, -5.8 to 3.2 %), arms LST (-1.8±4.4 %, -9.9 to 4.1 %), TBW (-0.9±3.9 %, -9.2 to 5.9 %), ECW (-0.5±5.0 %, -15.8 to 5.9 %), ICW (-1.0±5.4 %, -10.9 to 8.6 %), energy intake (-4.3±29.0 %, -54.1 to 54.9 %), and PO (2.9±12.3 %, -24.0 to 41.3 %). Changes in PO were only related with changes in TBW (r=0.711, p<0.001) and ICW (r=0.605, p=0.002); these associations remained after controlling for weight and arms LST changes (r=0.658, p=0.001 and r=0.633, p=0.002, respectively) which means that those athletes that lost TBW, specifically the ICW compartment, were those that reduced PO.

CONCLUSIONS: To avoid upper-body power reductions before a competition, athletes should not decrease TBW and ICW. Together, these findings highlight the need of assessing hydration changes in Judo athletes.

© 2009 American College of Sports Medicine