Efectos de la alcalosis metabólica inducida por la dieta en el rendimiento anaeróbico de alta intensidad / Effects of the metabolic alkalosis induced by the diet in the high intensity anaerobic performance

Objetivos: El propósito principal de este estudio es comparar el efecto de una alcalosis y acidosis inducidas por la dieta sobre el rendimiento en un esfuerzo anaeróbico láctico mantenido. Métodos: Para ello, trece sujetos activos se sometieron de forma cruzada a sendas dietas durante dos días y medio. Inmediatamente después realizaron una prueba de esfuerzo anaeróbica láctica máxima de estado estable hasta el agotamiento sobre cicloergómetro a 250W.Resultados: La valoración de las dietas mostró una diferencia significativa en la excreción renal neta de ácidos (NAE) estimada, así como un déficit calórico del54% en la dieta alcalinizante, debido principalmente a una ingesta reducida de hidratos de carbono. En un 83% de los sujetos aumentó el pH urinario tras la dieta alcalinizante. El 77% incrementó sus niveles de lactato en sangre en la prueba tras la dieta alcalina. Los tiempos hasta la extenuación durante la prueba mejoraron o se mantuvieron en un 58% de los sujetos, siendo las mujeres las que mejor respondieron a la dieta con un 83% de casos. Conclusiones: Parece haber evidencias de mejora de rendimiento en esfuerzos de tipo anaeróbico láctico hasta el agotamiento de 60 s a 2 min de duración tras consumir una dieta con potencial alcalinizante (AU)

Objectives: The purpose of this study is to compare the effects of two diets, one acidifier and the other alkalizer, on the sport performance in an extreme anaerobic stress test. Methods: For that purpose thirteen individuals were subjected to two such diets in a crossed test for two and a half days. Immediately after, they were tested in a maximumlactic anaerobic stress test of stable state to exhaustion on an ergo-cycle at 250W. Results: The assessment of the diets yielded a significant difference in the estimated NAE (net acid excretion) and a caloric deficit of 54% on the alkalizer diet,mainly due to a reduced ingestion of carbohydrates.The urinary pH increased by 83% for the individuals subjected to the alkalizer diet, 77% of those subjects experienced an increase in their blood lactate level during the test. The time to exhaustion while on the test improved or remained in 58% of the subjects, being the females who reacted best to the diet in 83% of the cases. Conclusions: There seems to be evidence of improvement in extreme anaerobic stress test to exhaustion from 60s to 2 mins of duration after consuming a diet with alkalizer potential (AU)

[Effects of the metabolic alkalosis induced by the diet in the high intensity anaerobic performance]. / Efectos de la alcalosis metabólica inducida por la dieta en el rendimiento anaeróbico de alta intensidad.

OBJECTIVES: The purpose of this study is to compare the effects of two diets, one acidifier and the other alkalizer, on the sport performance in an extreme anaerobic stress test. METHODS: For that purpose thirteen individuals were subjected to two such diets in a crossed test for two and a half days. Immediately after, they were tested in a maximum lactic anaerobic stress test of stable state to exhaustion on an ergo-cycle at 250 W. RESULTS: The assessment of the diets yielded a significant difference in the estimated NAE (net acid excretion) and a caloric deficit of 54% on the alkalizer diet, mainly due to a reduced ingestion of carbohydrates. The urinary pH increased by 83% for the individuals subjected to the alkalizer diet, 77% of those subjects experienced an increase in their blood lactate level during the test. The time to exhaustion while on the test improved or remained in 58% of the subjects, being the females who reacted best to the diet in 83% of the cases. CONCLUSIONS: There seems to be evidence of improvement in extreme anaerobic stress test to exhaustion from 60 s to 2 mins of duration after consuming a diet with alkalizer potential.

The effect of sodium citrate intake on anaerobic performance in normoxia and after sudden ascent to a moderate altitude.

BACKGROUND: The effect of sodium citrate intake on anaerobic performance in normoxia and acute hypoxia was tested in 17 healthy male subjects. METHODS: The subjects underwent a high-intensity exercise protocol in conditions of normoxia (N) and at 2320 m above the sea level (H). Each condition was combined with the intake of a placebo (Pl) or sodium citrate (C). RESULTS: The results obtained showed a drop in the maximum HR (p<0.001), due to the effect of the altitude (185+/-8 vs 176+/-8 bpm for N and H under Pl conditions and 189+/-9 vs 178+/-8 bpm for N and H under C conditions). C caused an increase in the RER (p<0.05) and the maximum Lac (p<0.01). The action of this same factor brought about a drop in the maximum VE (p<0.01) (182.60+/-21.58 vs 177.38+/-20.29 l x min(-1) in N and 185.71+/-22.98 vs 179.06+/-22.91 l x min(-1) in H). The interaction of both C and H affected the maximum concentration of lactate obtained (p<0.01), which fell as regards that expected by the corresponding action of both factors separately (14.33+/-2.94 vs 17.8+/-2.74 mMol x l(-1) with Pl and C in N and 15.29+/-2.15 vs 15.54+/-2.59 mMol x l(-1) in H). There were no significant differences in the length of work time in each of the conditions established. CONCLUSIONS: It would, therefore, seem that in the conditions described, the intake of sodium citrate does not cause appreciable changes in anaerobic performance.