Graduate Thesis Or Dissertation
 

The acute effects of moderate intensity circuit weight training on lipid-lipoprotein profiles

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  • Few studies have examined the acute effects of resistive-type exercise on lipid-lipoprotein profiles. This study examined the acute effects of a single session of circuit weight training (CWT) on plasma lipid-lipoprotein profiles: triglycerides (TG), total cholesterol (TC), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C), and the ratio of TC to HDL-C. The subjects in the study were 17 healthy, nonsmoking male university students, ages of 18-25 years, enrolled in weight lifting classes. Subjects were required to fast overnight (at least 12 hours) before CWT. Subjects repeated a four-station weight training circuit three times, with a resistance determined by their individual 3 repetition maximum (3-RM). The stations were bench press, parallel squat, leg extension, and seated row. Blood samples were drawn from the antecubital vein at pre-CWT, completion of the 1st and 3rd circuits, and 15 min post-CWT. All concentrations of plasma lipid and lipoprotein cholesterol were corrected for plasma volume changes. A repeated measures ANOVA was used to determine if significant differences existed among mean values for the dependent variables (i.e., levels of TG, TC, HDL-C, LDL-C, and TC/HDL-C ratio at specified time points). Results of the study indicated that plasma TC and HDL-C levels were changed significantly during and following CWT. However, the change was not in the anticipated direction: Plasma TC and HDL-C levels were lower at completion of the 1st circuit of CWT (p<0.05). The ratios of TC to HDL-C were changed significantly, reflecting a decrease in HDL-C during CWT and a slight increase in HDL-C at 15 min post-CWT. Plasma TG and LDL-C levels were not changed significantly during CWT or 15 min post-CWT. It was concluded that apparent changes in lipoprotein patterns occur during short-term moderate intensity CWT and return to pre-CWT levels in a relatively short time.
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