Effects of aerobic-resistance (concurrent) exercise intensities on serum levels of leptin, lactate, glucose and net protein in active men

By increasing the intensity of physical exercises the energy consumption is also increased, which may cause possible alterations in serum leptin levels, independent of fat cells. Hence, the aim of this study was to investigate the effects of various intensities of aerobic-resistance (concurrent) exercises on the levels of serum leptin,lactate, glucose and net protein in active men. In a semi-experimental study plan, ten healthy young active men, aged 21.5±1.4 years, BMI 21.88±1.2 kg/m2, performed concurrent (aerobic and resistance exercise) exercise at the three levels of low, moderate and high intensities. Different intensities of aerobic exercise included running on treadmill at the speed of 8, 9.6 and 11.2 km/hr. The resistance exercises were composed of 45, 65 and 85% of 1- repeated maximum intensity in six motions. The data for aerobic and resistance exercises were all justified to a same level. Blood samples were taken before and immediately and 24 hours after exercise. The results show that the plasma lactate concentration increased immediately after exercise in compareto prior and 24 hours after exercise at all levels of intensity (P<0.05). An acute bout of concurrent exercise at different levels of intensity did not result in significant alterations in plasma leptin (P>0.05). Our findings also indicated that plasma glucose and total protein levels of participants did not significantly change immediately and 24 hours after exercise in compare to pre-exercise levels at different intensities of physical activity. This study suggests that the different intensities of concurrent exercise does not change effectively the leptin levels in young active men.