Efecto ergogénico de la ingesta de fosfato sódico en sujetos físicamente activos / Ergogenic Effect of Sodium Phosphate Intake in Physically Active Subjects

Abstract

RESUMENEste estudio pretende evaluar los efectos de la ingesta de fosfato sódico a corto plazo, sobre la composición corporal, serie roja y parámetros ergoespirométricos máximos y submáximos. A una muestra de 20 sujetos físicamente activos, separados en dos grupos, se les suministró fosfato sódico durante 7 días (50 mg/kg masa magra) o placebo. Ambos grupos realizaron una prueba de esfuerzo incremental máxima en cicloergómetro, siguiendo el

The Effects of Sodium Phosphate Supplementation on the Cardiorespiratory System and Gross Efficiency during Exercise under Hypoxia in Male Cyclists: A Randomized, Placebo-Controlled, Cross-Over Study

“…In our study, we did not observe any significant changes in VO 2 and RER during exercise at a given workload. Similarly, no significant decrease in submaximal RER or VO 2 after phosphate loading was reported in studies conducted under normoxic conditions [10,38,44,69]. Our findings suggest that phosphate salts did not shift the use of metabolic substrates towards fat utilization and did not reduce the energy cost of exercise at an intensity > 60% of VO 2max in hypoxic conditions.…”

“…Our findings suggest that phosphate salts did not shift the use of metabolic substrates towards fat utilization and did not reduce the energy cost of exercise at an intensity > 60% of VO 2max in hypoxic conditions. Interestingly, Marcos et al [38] found that SP ingested for seven days at a dose of 50 mg/kg lean body mass improved energy efficiency at low exercise intensity, where the major metabolic substrate for energy production is fat oxidation. It should be noted that efficiency in their study was calculated for a lower exercise intensity than in our experiment, which may be reflected by the differences in RER (0.82-0.86 vs. 0.93-0.98).…”

“…The above observation suggests that SP supplementation may offer more ergogenic benefits for low-intensity exercise. Since hypoxia impairs aerobic metabolism [70], it is also possible that the energy cost of exercise is reduced following intake of phosphate salts when exercise is conducted under normoxic [38] but not hypoxic conditions. However, further investigation is needed to clarify this issue.…”

“…It was demonstrated that the intracellular concentration of inorganic phosphate (Pi) is an important determinant of mitochondrial oxidative phosphorylation [36,37], and that a decrease in muscle ATP synthesis may be associated with low blood Pi concentrations [37]. Recently, Marcos et al [38] reported that sodium phosphate intake improves energy efficiency (reduction of oxygen consumption at the same workload) during exercise at low intensity in normoxia. Thus, we expect that SP supplementation improves GE under hypoxic conditions.…”