تاثيرات شدت و مدت تمرين بر زير رده هاي لكوسيتي خون در مردان ورزشكار

The Effects of Exercise Intensity and Duration on Blood Leukocyte Subsets in Male Athletes

The aim of the present study was to compare the effects of exercise at 85% V02max (30 min.) with prolonged exercises at a lower work rate (60% V02max for over 1.5 h) on blood leukocyte counts and the percent of blood leukocyte subsets in young male athletes. Fifteen athlete male university students (mean±SD age 22.3±2.6 yr, weight 65.5±5.72 kg and height 174.2±3.64 cm) participated in this study. After physical examinations, subjects performed running on an electrical treadmill at 60% V02max (90 min.). In next session with an interval of not more than one week, subjects performed exercise on the same treadmill at 85% V02max for 30 min. Blood samples were collected from a peripheral arm vein before and immediately after the exercise sessions and served to determine total and differential leukocyte counts. The obtained data were analyzed by MedCalc statistical software and t-tests. Both exercise bouts significantly (p<0.05) increased blood leukocyte counts. Mean blood leukocyte increased from 6.4±0.79 to 10.26±3.3 and from 6.32±0.75 to 9.85±2 (*106/ml) after exercise at 60% V02max (1.5 h) and 85% V02max (30 min.) respectively. After exercise at a lower work rate for a longer duration, the percent of blood monocytes (1.25%) and neutrophils (11%) were significantly higher and the percent of blood lymphocytes (11.75%) were significantly lower than those observed at 85% V02max. However, no significant differences were observed in the percent of blood monocytes after both O XII Abstracts O exercise bouts (p<0.05).The results showed that when exercise is very prolonged, the diminution of innate immune function is greater than or at least as much as that observed after fatigue exercise at higher work rates. However, the sum of acute responses observed in this study may be used to improve health in athletes, but obviously it is necessary to conduct further studies.