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KMID : 1140420200290010067
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Journal of Obesity & Metabolic Syndrome
2020 Volume.29 No. 1 p.67 ~ p.75
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Twelve Weeks of Aerobic Exercise at the Lactate Threshold Improves Autonomic Nervous System Function, Body Composition, and Aerobic Performance in Women with Obesity
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Park Hun-Young
Jung Won-Sang
Kim Ji-Su
Hwang Hye-Jung
Lim Ki-Won
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Abstract
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Background: The present study examined the effects of a prolonged exercise intervention at the lactate threshold (LT) on body composition, aerobic performance, and the autonomic nervous system (ANS) in women with obesity.
Methods: A total of 36 obese Korean women aged 36 to 55 years (mean±standard deviation, 44.8±5.2 years) were randomly assigned to a control group (CON, n=18) or an experimental group (EXP, n=18); and EXP underwent aerobic exercise training three times a week at a heart rate corresponding to the LT (HR_LT) for 12 weeks. All dependent variables (body composition, aerobic performance, and ANS function parameters) were evaluated before and after training.
Results: Compared with the CON group, the EXP group showed significant improvement in body composition (body weight, ?4.57 vs. ?2.40 kg; body mass index, ?1.79 vs. ?0.96 kg/m2; %body fat, ?4.63 vs. ?1.41; fat-free mass, 3.24 vs. ?0.08 kg), aerobic performance (oxygen consumption at LT, 5.74 vs. 0.12 mL/kg/min; maximal oxygen consumption, 5.41 vs. 2.14 mL/kg/min; treadmill speed at HR_LT, 1.40 vs. 0.29 km/hr; bicycle load at HR_LT, 18.62 vs. 4.52 w; and ANS function (mean RR, 50.83 vs. ?15.04 ms; standard deviation of NN intervals, 5.08 vs. ?0.55 ms; root mean square of successive differences, 6.42 vs. 1.87 ms; total power, 0.34 vs. 0.10 ms2; high frequency, 0.32 vs. ?0.04 ms2; low frequency/high frequency, ?0.09 vs. 0.01).
Conclusion: Aerobic exercise at the LT for 12 weeks is a practical method of improving body composition, aerobic performance, and ANS function for women with obesity.
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KEYWORD
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Aerobic exercise, Body composition, Aerobic performance, Autonomic nervous system, Obesity
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