Moderate, but not vigorous, intensity exercise training reduces C-reactive protein

Area of Science:

• Exercise Physiology
• Cardiometabolic Health
• Sports Science

Background:

• Sprint interval cycle training is popular but its effects on cardiometabolic disease risk factors, particularly in young women, require further investigation.
• Overweight and obese (OW/OB) young women are a key demographic for targeted health interventions.
• Understanding the comparative efficacy of different training intensities is crucial for public health recommendations.

Purpose of the Study:

• To compare the efficacy of moderate-intensity cycling (MOD-C) and vigorous sprint-interval cycling (VIG-SIC) over six weeks.
• To assess the impact of these training interventions on lipid profiles, insulin (INS), insulin resistance (HOMA-IR), and C-reactive protein (CRP).
• To evaluate these effects in inactive, OW/OB young women under conditions of matched energy expenditure.

Main Methods:

• Forty-four inactive, OW/OB young women (BMI ≥25 kg/m², waist circumference ≥88 cm) were randomized into MOD-C or VIG-SIC groups.
• Training involved supervised sessions three days/week for six weeks, with energy expenditure matched between groups.
• Measurements included dual x-ray absorptiometry for adiposity, lipid profiles, INS, HOMA-IR, and CRP.

Main Results:

• Both MOD-C and VIG-SIC improved high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C).
• Neither training program significantly altered total cholesterol, triglycerides, INS, or HOMA-IR.
• A statistically significant greater improvement in C-reactive protein (CRP) was observed in the MOD-C group compared to the VIG-SIC group (p=0.034).

Conclusions:

• Moderate-intensity cycling may offer superior benefits for reducing inflammation, as indicated by CRP levels, compared to vigorous sprint interval cycling.
• While both training modalities positively impact certain aspects of lipid profiles, neither effectively reduced insulin resistance markers in this cohort.
• Further research is warranted to explore optimal exercise prescriptions for improving cardiometabolic health in young, OW/OB women.