Elhusseini Rami, Fares Elie-Jacques, Obeid Omar
Department of Nutrition and Food Sciences, Faculty of Agricultural and Food Sciences, American University of Beirut, Beirut, Lebanon.
BMJ Open Sport Exerc Med. 2020 Apr 8;6(1):e000714. doi: 10.1136/bmjsem-2019-000714. eCollection 2020.
The impact of phosphorus supplementation on athletic performance is unclear. Ingestion of phosphorus for several days has been reported to increase cardiac capacity, improve oxygen muscle kinetics and enhance lactate buffering capacity. Recent studies have shown that phosphorus ingestion with a meal increases postprandial glucose uptake and thermogenesis. The present study aimed to assess the effect of acute phosphorus ingestion with a meal on specific workload parameters.
A double-blind, crossover trial of 12 male water polo players between 18 and 22 years old was conducted. Overnight fasted subjects were asked to cycle for 20 min before ingesting 100 g of glucose with phosphorus or placebo (400 mg). Three hours later, they were asked to perform a graded cycling exercise for 25 min.
Expenditure, respiratory quotient, perception of fatigue and exercise efficiency were similar between treatments. However, heart rate was significantly higher in the phosphorus group (142±10 beats/min) compared with placebo (135±10 beats/min).
Exercise performance 3 hours after the coingestion of glucose with phosphorus did not affect substrate use, while heart rate was increased. The heart rate increase could be attributed to a rise in core body temperature.
NCT03101215.
补充磷对运动表现的影响尚不清楚。据报道，连续几天摄入磷可增加心脏功能、改善肌肉氧动力学并增强乳酸缓冲能力。最近的研究表明，进餐时摄入磷可增加餐后葡萄糖摄取和产热。本研究旨在评估进餐时急性摄入磷对特定工作负荷参数的影响。
对12名年龄在18至22岁之间的男性水球运动员进行了一项双盲交叉试验。要求过夜禁食的受试者在摄入含磷或安慰剂（400毫克）的100克葡萄糖之前骑行20分钟。三小时后，要求他们进行25分钟的分级骑行运动。
各治疗组之间的能量消耗、呼吸商、疲劳感和运动效率相似。然而，磷组的心率（142±10次/分钟）明显高于安慰剂组（135±10次/分钟）。
葡萄糖与磷同时摄入3小时后的运动表现不影响底物利用，但心率增加。心率增加可能归因于核心体温升高。
NCT03101215。
