Author + information
- Yaoshan Dun,
- Joshua R. Smith,
- Jose R. Medina-Inojosa,
- Mary C. MacGillivary,
- Randal J. Thomas,
- Suixin Liu,
- Ying Cai and
- Thomas P. Olson
High-intensity interval training (HIIT) is promoted as a time-efficient strategy to improve body composition. The present study examined the efficacy of HIIT on total and abdominal fat mass in cardiac rehabilitation (CR) patients with Myocardial infarction (MI).
A total of 391 MI patients enrolled in CR were retrospectively screened between 2015-2018. We included 120 patients who completed 36 sessions of CR and also pre-post dual-energy X-ray absorptiometry (DXA). Of the 120 patients, 90 engaged in HIIT with 30 MICT (moderate-intensity continuous training) only. The HIIT group performed 4-8 alternating intervals of high-intensity (1 min at RPE 14-17 [Borg 6-20]) and low-intensity (3-5 min at RPE 10-12), and MICT performed 30 min of exercise at RPE 11-14. The primary outcome was changes in fat mass via DXA within and between groups, and the changes were assessed with two sample t-test.
Groups had similar age, sex, body mass index (BMI), comorbidities, and medications (Table 1). HIIT significantly reduced fat mass, percent total body fat, waist fat and circumference, and increased lean body mass, and has greater efficacy compared to MICT. However, changes in body weight and BMI were not significant between groups (Table 2 and Figures).
12-week HIIT and MICT had similar changes in total body mass and BMI in CR patients with MI. However, HIIT was superior to MICT in reducing total body fat and abdominal fat mass and waist circumference, while increasing total lean mass.
Poster Hall, Hall F
Sunday, March 17, 2019, 9:45 a.m.-10:30 a.m.
Session Title: Prevention: Rehabilitation 2
Abstract Category: 34. Prevention: Rehabilitation
Presentation Number: 1234-447
- 2019 American College of Cardiology Foundation