Acute Effect of Fat(max) Exercise on the Metabolism in Overweight and Nonoverweight Girls

作者：Zakrzewski Julia K; Tolfrey Keith^*

来源：Medicine and Science in Sports and Exercise, 2012, 44(9): 1698-1705.

DOI：10.1249/MSS.0b013e31825804cf

• FAT OXIDATION
• GLUCOSE
• INSULIN
• CHILDREN
• ADOLESCENTS

ZAKRZEWSKI, J. K. and K. TOLFREY. Acute Effect of Fat(max) Exercise on the Metabolism in Overweight and Nonoverweight Girls. Med. Sci. Sports Exerc., Vol. 44, No. 9, pp. 1698-1705, 2012. Introduction: Acute exercise can reduce postprandial insulin concentrations and increase fat oxidation in adults, which may have important implications for insulin resistance and weight control. However, similar studies with young people or comparing overweight (OW) and nonoverweight (NO) individuals are sparse. Therefore, the acute effect of Fat(max), exercise on glucose, insulin, and fat oxidation was examined in 12 OW and 15 NO girls. Methods: Participants completed two 2-d conditions in a counterbalanced order. On day 1, participants either expended 2.09 MJ (500 kcal) during treadmill exercise at individual Fat(max) a (EX) or 0.47 MJ (112 kcal) during rest (CON). On day 2, capillary blood and expired air samples were taken in the fasting state and at regular intervals for 2 h after high-glycemic-index breakfast consumption. Subsequently, blood glucose and plasma insulin concentrations were determined, and fat oxidation was estimated. Results: Blood glucose was similar between conditions in both groups (P %26gt; 0.05). Fasting plasma insulin (P = 0.047) and total area under the 2-h curve (P = 0.049) were reduced for EX compared with CON in the NO, but not OW girls (P %26gt; 0.05). Fasting fat oxidation was higher for EX than for CON in the NO girls (P = 0.036) and fat oxidation total area under the 2-h curve was higher for EX in both groups of girls (P %26lt;= 0.05). Conclusions: A bout of Fat(max,) a exercise performed similar to 16 h before high-glycemic-index breakfast consumption reduced fasting and postprandial insulin concentrations in NO girls and increased fat oxidation in both OW and NO girls. The higher postintervention energy and CHO intake in the OW compared with the NO girls or differences in metabolism between the two groups may have compromised potential exercise-induced reductions in insulin the OW girls.

• 出版日期2012-9