Effect of adding high-intensity interval training to diet and carboxytherapy on metabolic cardiovascular risk factors in women with metabolic syndrome

Introduction
Metabolic syndrome has traditionally been associated with cardiovascular diseases and has recently been linked to increased susceptibility to COVID-19 infection, thus highlighting the need for multimodal interventions to optimize management of this condition.

Aim
To assess the effects of high-intensity interval training (HIIT) alongside a low-fat diet and carboxytherapy on metabolic syndrome features.

Material and methods
Sixty women (50–60 years old) diagnosed with metabolic syndrome were assigned to a 4-week intervention of either HIIT in combination with a low-fat diet and carboxytherapy (experimental group: n1 = 30, age = 54.17 ±2.82 years, body mass index (BMI) = 32.10 ±0.91), or a low-fat diet and carboxytherapy only (active control group: n2 = 30, age = 54.10 ±2.64 years, BMI = 32.12 ±1.19). Exclusion criteria were uncontrolled hypertension, diabetes mellitus, coronary artery disease, smoking, contraindications to carboxytherapy, and contraindications to exercise testing/training. Outcome measures were waist circumference (WC), BMI, serum triglycerides (TG), systolic blood pressure (SBP), diastolic blood pressure (DBP), high-density lipoproteins (HDL), and fasting blood glucose (FBG).

Results
Both groups showed significant improvements in all outcome measures compared to baseline values (p < 0.05). The experimental group showed significantly greater improvements in mean values of WC, BMI, TG, SBP, DBP, and FBG (p < 0.05), as well as a tendency for a significant difference in HDL (p = 0.075) compared to the control group.

Conclusions
The addition of HIIT to a low-fat diet and carboxytherapy could lead to greater improvements in metabolic cardiovascular risk factors in women with metabolic syndrome than a low-fat diet and carboxytherapy alone. This could suggest a good rationale for the inclusion of HIIT in the multimodal interventions rendered to women with metabolic syndrome.