The positive effects of aerobic exercise on the nitric oxide is known, but the effects of nitric oxide on anaerobic training and on the role of gender is not clear. Therefore, in this study, aerobic (swimming group) and anaerobic (volleyball group) training effects on blood nitric oxide levels and the role of gender in this effect were investigated. In this study; participants between the ages of 20-25 and have similar physical characteristics, from swimming as a aerobic group; 8 female and 11 male athlete, from volleyball as a anaerobic group; 8 female and 11 male athlete and as a control group that does not do regular exercise have 8 female and 11 male were included to the study. Wingate test and the lactate minimum speed (LMS) test was applied the volunteers. For the nitric oxide analysis from venous blood, cadmium is used as the reductor to `Griess method` has been identified with. Lactic acid analysis was determined by electro-enzymatic method for lactate minimum speed. Data were analyzed using the SPSS 11.0 statistical program, significance as p value <0.05 were used. Basal serum nitric oxide levels in male aerobic group was higher from control group (p <0.05) and anaerobic group (%11.4). Basal serum nitric oxide levels for females; no significant differences were found between the aerobic, anaerobic and control group (p> 0.05). But aerobic group`s basal serum nitric oxide level was bigger from the other two groups. There were no significant differences found between male and female groups at basal serum nitric oxide levels and there were no significant relationship between basal serum nitric oxide levels and lactate minimum speed in all group. In male and female`s; aerobic group lactate minimum speed were higher than control group (p<0.05), peak power and mean power of anaerobic group were higher than aerobic group (p<0.05). As a result; positive effect has been found on the blood serum nitric oxide levels with regular aerobic exercise training at significant level in males, these effect not the same for females. There were no significant effects of anaerobic training on blood nitric oxide levels.
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