Background: Physical inactivity has shown to increase adipose tissue in the two abdomen compartments - subcutaneous adipose tissue (SAT) and visceral adipose tissue (VAT). VAT can be deposited around vital organs and has independently been linked to the risk of developing metabolic diseases. High-intensity exercise may provide the proper effect on the stimulatory receptors and promote lipolysis in VAT. However, evidence on the specific effect of regional VAT reduction along the anatomical trunk induced by progressive resistance training (PRT) alone is lacking. Therefore, the purpose of this study was to examine the effects of short-term, high-intensity PRT on abdominal adiposity in females with obesity. Methods: A total of 11 physically inactive females ages 23.5+4 (BMI of 34.1+3.3 kg/m2) were analyzed. Magnetic resonance imaging (MRI) scans, dual energy x-ray absorptiometry scans, one-repetition maximum (1-RM) test on leg press (LP) and bench press (BP), and exercise familiarization (baseline only) were performed. Participants were required to attend to either PRT or control sessions 3 days a week for 3 weeks. The PRT group performed 3 circuits of 7 exercises, while maintaining a 70% 1-RM. MRI scans were divided in regions from lumbar 5 to thoracic 10 (T10). Results: Non-parametric test showed statistically significant differences in percentage of change (%δ) between groups for VAT-L1 (z=-2.556, p=0.009), VAT-T11 (z=-2.373, p=0.0017), and VAT-T10 (z=-2.739, p=0.004). Where, the PRT group decreased VAT at T11 (-5.6+18.2) and T10 (-7.5+12.4), and the control group increased VAT at L1 (26.35+10.65), T11 (35.45+21.77) and at T10 (21.81+8.73). A statistically significant difference in %δ was found for body fat percentage between groups (z=-2.01, p=0.045), and pre- to post- for lean body mass (LBM) for PRT group (2.5+2.56, p=0.028). Strength tests were statistically significant different between groups [LP (z=-2.745, p=0.004) and BP (z=-2.745, p=0.004)], and the PRT group significantly improved from pre- to post- intervention [BP (15.30+3.15, p=0.028) and LP (14.21+7.84, p=0.028)]. No significant results were found for %δWtHr or %δSAT at any vertebral region. Conclusion: Despite the significant improvements observed in LBM, LP, and BP in the PRT group, no significant changes in SAT or VAT were found in the PRT group. However, a significant increase in regional VAT was detected in the control group.
|Commitee:||Fernandez-del-Valle, Maria, Smith, Bryan, Webb, Benjamin|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 58/06M(E), Masters Abstracts International|
|Keywords:||High-intensity exercise, Obesity, Regional adipose tissue, Resistance training, Visceral adipose tissue|
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