The aim of this study was to investigate the effect of ingesting sodium bicarbonate (SB) and sodium citrate (SC) on 400 m high-intensity swimming performance and blood responses. Six nationally ranked male swimmers (20.7 ± 2.1 yrs; 184 ± 6 cm; 79.9 ± 3.9 kg; 10.6 ± 1% body fat) participated in a double blinded, placebo controlled crossover trial. Ninety minutes after consuming SB (0.3 g·kg-1), SC (0.3 g·kg-1) or a placebo (PL) participants completed a single 400-m freestyle maximal test on three consecutive days. The order of the supplementation was randomized. Capillary blood samples were collected on 4 occasions: at rest (baseline), 60 min post-ingestion, immediately post-trial and 15 min post-trial. Blood pH, HCO3- concentration and base excess (BE) were determined. Blood pH, HCO3-, BE were significantly elevated from before loading to the pre-test (60 min post-ingestion) (p < 0.05) after SB ingestion, but not after SC ingestion (p > 0.05). Performance times were improved by 0.6% (p > 0.05) after supplementation of SB over PL in 5 out of 6 participants (responders). In contrast, ingestion of SC decreased performance by 0.2% (p > 0.05). No side effects were observed in either trial. Delayed blood response was observed after SC ingestion compared to SB and this provided no or modest ergogenic effect, respectively, for single bout high-intensity swimming exercise. Monitoring the magnitude of the time-to-peak level rise in alkalosis may be recommended in order to individualize the loading time accordingly before commencement of exercise.
This study was designed to compare the growth of Pakistani schoolchildren in the UK with the 1990 UK growth standards. Measurements of height, weight, and sitting height were performed on 785 Pakistani schoolchildren aged 5-14 years with the mean values for each age and sex being plotted on the UK growth standards. The results were expressed as SD scores relative to the 1990 reference data.The mean height for the boys was only 0.2 SD scores below the mean for the new growth standards with the mean height for the girls being 0.4 SD scores below the mean. The mean values for weight and body mass index were 0.3 and 0.5 SD scores less than the mean for boys and girls respectively. This study demonstrates that the growth of Pakistani schoolchildren in the UK is comparable to the 1990 UK growth standards with only minor diVerences. It is not safe to assume that short stature or low body weight in a Pakistani child is due to his or her ethnic background. (Arch Dis Child 1997;77:401-405) Keywords: growth; growth standards; Pakistani childrenThe 1990 UK reference charts are the most recent cross sectional growth standards for British children and were published in 1995.
The nutritional intake of elite open water swimmers during competition is not well established, and therefore this case study aims to provide new insights by describing the feeding strategies adopted by an elite female swimmer (28 yrs; height; 1.71 m; body mass: 60 kg; body fat: 16.0%) in the FINA open water Grand Prix 2014.Seven events of varying distances (15-88 km) and durations (3-12 hrs) were included. In all events, except one, feeds were provided from support boats. Swimmer and support staff were instructed to track in detail all foods and beverages consumed during the events. Nutritional information was gathered from the packaging and dietary supplements labels and analyzed by nutrition software. Mean carbohydrate (CHO) and protein intake reached 83 ± 5 g·h-1 and 12 ± 8 g·h-1, respectively. Fat intake was neglected (~1 g·h-1). Mean in-race energy intake reached 394 ± 26 kcal·h-1. Dietary supplements in the form of sport beverages and gels, containing multitransportable CHO, provided 40 ± 4 and 49 ± 6% of all CHO energy, respectively. Caffeine (3.6 ± 1.8 mg·kg-1 per event) and sodium (423 ± 16 mg·h-1) were additionally supplemented in all events. It was established that continuous intake of high doses of CHO and sodium and moderate dose of caffeine were an essential part of the feeding strategy for elite-level high intensity ultra-endurance open-water swimming races. A well scheduled and well-prepared nutrition strategy is believed to have ensured optimal individual performance during Grand Prix events.
The aim of the study is to investigate the comparative effect of compression sleeves, rest and active recovery on performance and immediate recovery from high-intensity cycling performance (HICP). Eight recreationally trained male cyclists completed three trials, each separated by one week. Each trial consisted of two 10-min high intensity exercise task (30-20-10 s maximal HICP bouts with 3 min 1 W/kg recovery) separated by application one of the three 24-min recovery strategies (active -cycling 1W/kg, ACT; passive -supine position, PAS; passive -sitting with compression sleeves; PAS+CS). Applied recovery strategy effectiveness was assessed via changes in blood lactate clearance (LA), acid-base changes and performance parameters (fatigue index, FI; peak power, PP and relative peak power). Fatigue index was significantly improved by ACT for 30s and 20s HICP. There was a significant decrease in FI for PAS + CS (p = 0.041) and PAS (p = 0.026) showing a negative impact of PAS + CS and PAS for keeping PP during 10s task. The rate of decrease in plasma LA concentration over the 24-min recovery period was significantly higher in ACT (0.50 ± 0.1 mmol/min) compared to PAS and PAS+CS (0.31 ± 0.07 mmol/l, p = 0.001, 0.37 ± 0.09 mmol/min, p = 0.024, respectively). The passive recovery strategies decreased the ability of keeping repeated maximal intensity cycling performance in contrast to active recovery. The use of compression calf sleeves has no significant additional effect on plasma lactate clearance after high intensity anaerobic exercise above resting condition.
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