Effects of HIIT and MICT on visceral fat and carotid hemodynamics in obese adults
Question
How do HIIT and MICT affect visceral fat indicators and carotid hemodynamic parameters in obese young adults?
Summary
In young men with obesity, 8 weeks of supervised HIIT or moderate continuous exercise improved several body-composition and carotid blood-flow measures compared with a non-exercise control. The HIIT protocol details were only partly described in text, limiting translation.
Methodology
- Male obese college-aged adults
- 52 participants.
- High-intensity interval/circuit exercise.
- Work intervals: Continuous exercise for MICT.
- Intensity: 80-95% HRmax.
- 10-30 min.
- 3-4 sessions/week.
- 8 weeks.
- Prospective controlled exercise trial with randomized exercise groups and separately recruited control group
- Body composition, Carotid hemodynamics, and Blood lipids were tracked.
Outcomes
Body fat
Fat mass, body fat percentage, waist circumference, and LAP improved in the exercise groups.
FM/BF%/WC decreased in HIIT and MICT; LAP decreased HIIT p < 0.01 and MICT p < 0.05
Blood velocity
Blood velocity and wall shear stress increased after HIIT and MICT.
Blood velocity and WSS increased after HIIT/MICT, p < 0.01
Carotid indices
HIIT improved several carotid hemodynamic markers, including lower oscillatory shear and arterial stiffness.
HIIT OSI decreased 0.15 to 0.09, p = 0.001; arterial stiffness 4.04 to 3.28, p = 0.001; circumferential strain increased 0.11 to 0.13, p = 0.02
HIIT vs MICT
HIIT and MICT were broadly similar, with OSI differing between exercise groups.
ANCOVA showed HIIT vs MICT difference only for OSI, p < 0.01
Insights
- Both high- and moderate-intensity supervised exercise may improve vascular flow markers in young men with obesity.
- The article does not provide enough text detail to reproduce the HIIT circuit precisely.
- Carotid hemodynamic outcomes are mechanistic and not directly user-facing.
Limitations
- Men only
- Young obese adults only
- Small non-randomized control group
- Diet not strictly controlled
- HIIT protocol not fully reproducible from text
Safety
- Participants were screened with PAR-Q and recent medical reports/ECG-related safety checks; frequent absences and adherence issues led to exclusions, but adverse events were not emphasized.