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Training sessions took place over an average of ten hours per week, and the players had 6.8 years of experience in competitive soccer they were tested a third of way into the season. The heart rate response was determined by computerized EKG.

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Sixty professional male soccer players performed cardiopulmonary exercise tests on an ergometric treadmill respiratory gas exchanges were monitored throughout and blood lactate levels at peak effort was measured, using a portable device. We hypothesize that in players with better aerobic fitness, lactate production was not inhibited after high-intensity exercise, regardless of the footballer's position on the field. Furthermore, we did not observe any correlation between the anaerobic threshold and the hematological parameters. We assumed that these results occurred due to the plasma volume reduction and may be explained by the soccer training program characteristics. The specific soccer training program led to a rise in erythrocytes, hemoglobin, and hematocrit from T1 to T2. Erythrocytes concentration, hemoglobin, and hematocrit were significantly increased from T1 to T2. Correlations between the parameters analyzed were determined using the Pearson's correlation coefficient. Analysis of variance with Newman-Keuls'post hoc was used for statistical comparisons between the parameters measured during the soccer training program. On the second day at 8:30 am, the athletes had their anaerobic threshold measured. On the first day at 7:30 am, before collecting the blood sample at rest for the determination of the hematological parameters, the athletes were conducted to the anthropometric evaluation. Twelve athletes were evaluated at the beginning (week 0, T1), in the middle (week 6, T2), and at the end (week 12, T3) of the soccer training program. We assessed the responses of hematological parameters and their relationship to the anaerobic threshold of Brazilian soccer players during a training program. De esta manera, a partir del análisis de regresión entre los valores de Cooper y el OBLA fue posible determinar la ecuación de corrección que permita a través del Test de Cooper la obtención de la intensidad correspondiente al Lan determinado por el OBLA en futbolistas profesionales. Los resultados mostraron diferencias (p < 0,05) entre las velocidades (km.h-1) obtenidas por el Test de Cooper (15,09 ± 0,94) y el OBLA (14,28 ± 1,02) entre tanto, estos tests presentaron correlación con el Lacminat, mas las velocidades fueron similares con este protocolo. Cada atleta fue evaluado con los tres protocolos con un intérvalo mínimo de 48 horas y máximo de 72 horas.

Para ello, participaron 16 atletas provenientes de un equipo profesional afiliado a la serie A3 del futbol paulista. (1993) (Lacminat) y por el OBLA en futbolistas profesionales. El objetivo principal de este estudio fue el de comparar la intensidad de ejercicio obtenida por el test de 12 minutos con las intensidades obtenidas correspondientes al Lan obtenido por el protocolo adaptado al de Tegtbur et al. Como alternativa, uno de los tests no invasivos mas empleados en el medio deportivo es el de 12 minutos propuesto por Cooper. Independiente del método, la medida de la capacidad aeróbica a traves del Lan en esos casos exige una utilización de equipamientos sofisticados, además del elevado costo por atleta lo que torna su aplicación limitada. El umbral anaeróbico (Lan) puede ser determinado por protocolos que utilizan concentraciones fijas de lactato sanguíneo como el OBLA (Onset of Blood Lactate Accumulation) y los que utilizan procedimientos mas individualizados como el Lactato Mínimo (Lacmin).

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