We tested the effects of 9 d of a high-carbohydrate diet (80% of calories as CHO, 80% CHO diet) vs. a moderate-CHO diet (43% of calories as CHO, 43% CHO diet) on the abilities ofcollegiate swimmers to maintain a high intensity of interval swim training. Interval swim times and other physiological indices were recorded the last 5 d of each diet. Swim-interval distances ranged from 50-rn interval sets to continuous 3000-rn swims. There were no diet effects on mean swim velocities for any interval distance, and mean (±SEM) velocities for all swims were identical for both diets. There were no diet effects on the physiological indices; however, postswim blood lactate concentrations were higher after the 80% CHO diet. When mean ± SEM daily caloric intake is 19.56 ± 2.16 MJ (4675 ± 5 16 kcal) for swimmers undertaking swim training to develop aerobic capacity, an 80% CHO diet provides no advantage over a 43% CHO diet for maintaining interval-swim-training intensity.
Nineteen high school swimmers (13 male and 6 female) were subjects in an investigation that compared three methods for determining maximal oxygen uptake (VO2max). Oxygen uptakes were measured during a maximal tethered swim (T), and immediately following 200-yd (183 m) and 500-yd (457 m) unimpeded supramaximal swims from a single 20-s expired gas sample. Oxygen uptakes from the 183-m and 457-m swims correlated highly with those of the T swim (r = 0.94). In addition, VO2s from the 183-m swims were very similar to the VO2s of the 457-m swims (r = 0.96). Mean (+/- SE) VO2max from the T, the 183-m, and the 457-m swims, respectively, were 3.13 (+/- 0.19), 3.20 (+/- 0.19), and 3.20 (+/- 0.17) l/min. There were no significant differences among the three means (p greater than 0.05). This study demonstrates that a single 20-s recovery gas sample from unimpeded supramaximal freestyle swims is an accurate method to determine swimming VO2max.
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