a comparison between effects of high intensity and high volume training on lactate accumulation, time performance and vo2peak in 10-14 year old distance runners

this study aimed to compare the effects of high intensity and high volume training on lactate accumulation, time performance and vo2peak in 10-14 years old distance runners. 20 male endurance runners aged 12.5±2.32 years old and with a height of 154.62±3.27 cm, weight of 34.5±5.12 kg, maximum heart rate of 207.5±3.1 and vo2max of 36.45±3.22 ml /kg/min took part in the experiment. the experiment was undertaken randomly in a crossover form between two modes and two groups of runners (group a and b), and two intermittent exercise models. the exercise models included: (i) a high intensity and low volume (ht) model  (60 seconds exercise with 90% vo2 peak and 60 seconds rest with 30% vo2 peak) within 30 minutes activity and (ii) a low intensity and high volume (vt) model (60 seconds exercise with 65% vo2 peak and 60 seconds rest with 30% vo2 peak) within 60 minutes activity. the experiments were performed during two 6-week periods with a 5-week rest in between. respiratory exchange ratio (rer), time performance in 1500 meters (t1500m) and lactate maximum (lacmax) were measured throughout the exercises. repeated-measures anova and bonferroni post hoc tests were used to determine any significant difference between the groups and exercises. the results showed that there was a significant difference in the value of t1500m between pre and post ht and vt models (p