The Effects of High-Intensity Interval Training vs. Moderate-Intensity Continuous Training on Cardiovascular Health Indices in Obese postmenopausal women
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Authors
1Bandar Anzali Branch, Islamic Azad University, Bandar Anzali, Iran.
22th unit, Salar 5 Bldg Moalem St, Ghazian distric
3Islamic Azad University
Abstract
Obesity is recognized as a multi-factor metabolic change which is prevalent worldwide in women going through the menopausal transition. Obesity is associated with an increased risk of developing cardiovascular disease (CVD). The mechanisms through which obesity increases CVD risk involve changes in body composition that can affect hemodynamics. This study compared the effects of short-term high-intensity interval training (HIIT) versus moderate-intensity continuous training (MICT) on cardiovascular indices in obese postmenopausal women as a preliminary study. A sample of 32 menopausal women with average age: 52/05±2/6 years, height: 157/3± 3/7 cm, weight: 79/3±4/9 kg, BMI: 32/03±1/8 kg/m2 were selected as the statistical sample of this study. Subjects were randomly divided into two groups: HIIT (n= 16) and MICT (n= 16). The HIIT consisted of 20 minute stationary cycle ergometer test with 90% maximal heart rate (HRmax). Each minute was divided into two phases: activity and recovery phase (10 & 50 seconds, respectively). During the activity phase, subjects pedalled at a maximum speed of 100 rpm or higher and reduced their speed to 50 rpm during the recovery phase. The MICT consisted of 40 min cycling with 60-75% HRmax and a speed of 60 rpm. Warm up and cool down were done with the intensity of 40% HRmax and 5 min for each. Heart rate was recorded every five minutes during cycling. Cardiovascular health indices included: high-density lipoprotein, low-density lipoprotein and triglyceride. SPSS software version 22 was used for data analysis. Independent and dependent t-test was used to test the hypotheses. There was no significant difference in cardiovascular health indices between the two training groups (P = 0.397). In summary, we demonstrated that both MICT and HIIT have positive effects on cardiovascular health indices among obese postmenopausal women. These activities could be encouraged for they may help to prevent the risk of CVD.
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