Phosphate is integral to numerous metabolic processes, several of which strongly predict exercise performance (i.e., cardiac function, oxygen transport, and oxidative metabolism). Evidence regarding phosphate loading is limited and equivocal, at least partly because studies have examined sodium phosphate supplements of varied molar mass (e.g., mono/di/tribasic, dodecahydrate), thus delivering highly variable absolute quantities of phosphate. Within a randomized cross-over design and in a single-blind manner, 16 well-trained cyclists (age 38 ± 16 years, mass 74.3 ± 10.8 kg, training 340 ± 171 min/week; mean ± SD) ingested either 3.5 g/day of dibasic sodium phosphate (Na₂HPO₄: 24.7 mmol/day phosphate; 49.4 mmol/day sodium) or a sodium chloride placebo (NaCl: 49.4 mmol/day sodium and chloride) for 4 days prior to each of two 30-km time trials, separated by a washout interval of 14 days. There was no evidence of any ergogenic benefit associated with phosphate loading. Time to complete the 30-km time trial did not differ following ingestion of sodium phosphate and sodium chloride (3,059 ± 531 s vs. 2,995 ± 467 s). Accordingly, neither absolute mean power output (221 ± 48 W vs. 226 ± 48 W) nor relative mean power output (3.02 ± 0.78 W/kg vs. 3.08 ± 0.71 W/kg) differed meaningfully between the respective intervention and placebo conditions. Measures of cardiovascular strain and ratings of perceived exertion were very closely matched between treatments (i.e., average heart rate 161 ± 11 beats per minute vs. 159 ± 12 beats per minute; Δ2 beats per minute; and ratings of perceived exertion 18 [14–20] units vs. 17 [14–20] units). In conclusion, supplementing with relatively high absolute doses of phosphate (i.e., >10 mmol daily for 4 days) exerted no ergogenic effects on trained cyclists completing 30-km time trials.

磷酸盐是许多代谢过程不可或缺的组成部分，其中一些可以强烈预测运动表现（即心脏功能、氧气输送和氧化代谢）。关于磷酸盐负荷的证据有限且模棱两可，至少部分原因是研究检查了不同摩尔质量的磷酸钠补充剂（例如，单/双/三水合物，十二水合物），从而提供高度可变的磷酸盐绝对量。在随机交叉设计和单盲方式中，16 名训练有素的自行车手（年龄 38 ± 16 岁，体重 74.3 ± 10.8 千克，训练时间 340 ± 171 分钟/周；平均值 ± SD）摄入 3.5  g /磷酸氢二钠（Na ₂ HPO ₄: 24.7 毫摩尔/天磷酸盐；49.4 毫摩尔/天钠）或氯化钠安慰剂（NaCl：49.4 毫摩尔/天钠和氯化物）在两次 30 公里计时赛中的每一次之前持续 4 天，间隔为 14 天的清除间隔。没有证据表明磷酸盐负荷有任何增效作用。完成 30 公里计时赛的时间在摄入磷酸钠和氯化钠后没有差异（3,059 ± 531 秒对 2,995 ± 467 秒）。因此，绝对平均功率输出（221 ± 48 W 对比 226 ± 48 W）和相对平均功率输出（3.02 ± 0.78 W/kg 对比 3.08 ± 0.71 W/kg）在各自的干预和安慰剂条件下均无显着差异。心血管应变测量值和感知用力等级在治疗之间非常匹配（即，平均心率每分钟 161 ± 11 次 vs. 每分钟 159 ± 12 次；每分钟 Δ2 次；和感知用力等级 18 [14–20] 单位对 17 [14–20] 单位）。总之，补充绝对剂量相对较高的磷酸盐（即每天 > 10 毫摩尔，持续 4 天）对完成 30 公里计时赛的训练有素的自行车手没有产生增效作用。