Effects of aquatic exercise on lipid metabolism, body composition and peripheral blood Irisin level in obese middle school boys / 中国学校卫生

ABSTRACT

Objective@#To explore effects of aquatic exercise on lipid metabolism, body composition and peripheral blood Irisin level in obese middle school students, so as to provide reference for exercise and weight loss practice of obese children and adolescents.@*Methods@#Twenty six male students, recruited to participate in the summer youth swimming(weight loss) camp in Rudong County Jiangsu Province, were divided into non obese( n =12) and obese ( n =14) group. And t test method was applied for a statistical analysis of their ipid metabolism, body composition and peripheral blood irisin level before and after 8 week aquatic exercise.@*Results@#The high density lipoprotein cholesferol(HDL-C) in the obese group was significantly lower than nonobese group, which were (1.34±0.12) mmol/L and (1.51±0.21) ng/mL, respectively, and the differences were of statistical significance( t=2.81, 6.39 , 8.96, 12.69, -2.72 , P <0.05). After intervention, body weight, body mass index (BMI), fat mass(FM), body fat percentage(BF%) of obese male middle school students decreased from (77.31±8.26)kg, (28.02±1.67)kg/m 2, (25.16±3.59)kg and (32.65±3.90)% to (72.37±7.19)kg, (26.15±1.21)kg/m 2, (21.71±2.66)kg and (30.14±3.61)%，muscle mass(MM) increased from (25.09±3.41)kg to (26.76±3.55)kg. TC, TG, LDL-C contents decreased from (4.69±0.48, 1.31±0.26, 2.74±0.42)mmol/L to (4.28±0.42, 1.14±0.14, 2.36±0.36)mmol/L, HDL-C increased from (1.34±0.12)mmol/L to (1.47±0.11)mmol/L, and serum Irisin concentrations lowered from (192.17±23.27) ng/mL to (164.15±21.69)ng/mL of obese male middle school students. Serum Irisin concentrations of the obese positively related to BMI( r =0.68), FM( r =0.87) and BF( r =0.64), as well as TC( r =0.61), TG( r =0.86), LDL-C( r =0.85), but negatively associated with HDL-C( r =-0.63). A positive relations existed between different value of serum Irisin concentrations and BMI, FM before and after intervention of obese students( r =0.58, 0.53)( P <0.05).@*Conclusion@#Obese middle school students may be resistant to Irisin. 8 weeks of aquatic exercise can improve fat metabolism, body composition and serum Irisin levels of obese junior middle school students effectively. The qualified obese children and adolescents can use aquatic exercise as an intervention measure to control body weight reasonably and improve lipid metabolism.