RESUMEN
This study was designed to investigate the effect of a suggested physical training program on the level of physical fitness and the serum levels of lactate and lactate dehydrogenase enzyme in 30 male volunteered beginner boxers. Also, a special interest was focused on the relationship between the changes in both physical fitness and the serum biochemical parameters. The results showed that exhaustive muscular exercise caused significant increase in HR, Mean ABP, serum lactate and LDH either before the training program or after it. The results also showed that a training program of 3 months duration caused significant improvement in physical fitness parameters with significant decrease in serum lactic acid and significant increase in serum LDH. The results showed significant correlations between the physiological parameters and the biochemical parameters. So, it could be concluded that measuring serum lactic acid and LDH concentrations, in addition to the physiological measures, could be beneficial in designing and follow up of training programs