Associations Between Workday/Leisure Day Lifestyle Behavior and Cardiovascular Disease Risk Factors Among Night Shift...

Area of Science:

• Occupational Health
• Cardiovascular Disease Epidemiology
• Lifestyle Medicine

Background:

• Night shift work is a known risk factor for cardiovascular disease (CVD).
• The relationship between lifestyle behaviors (sedentary behavior, physical activity, sleep) and CVD risk factors in night shift workers (NSWs) remains poorly understood.
• NSWs exhibit distinct lifestyle patterns on workdays versus leisure days.

Purpose of the Study:

• To examine the associations between time spent on lifestyle behaviors and CVD risk factors in NSWs.
• To differentiate these associations between workdays and leisure days.
• To utilize an isotemporal substitution model to quantify the impact of reallocating time between behaviors.

Main Methods:

• A cross-sectional study involving 66 male NSWs.
• Objective measurement of lifestyle behaviors (sedentary behavior, light-intensity PA, moderate-to-vigorous PA, sleep) using tri-axial accelerometers.
• Assessment of CVD risk factors via periodic health checkups.
• Application of an isotemporal substitution model to analyze behavior reallocation effects.

Main Results:

• Lifestyle behavior patterns varied significantly between workdays and leisure days.
• On workdays, substituting sedentary behavior with light-intensity physical activity was linked to reduced waist circumference.
• On leisure days, substituting sedentary behavior or sleep with moderate-to-vigorous physical activity was associated with lower aspartate aminotransferase levels.

Conclusions:

• The impact of lifestyle behaviors on CVD risk factors differs between workdays and leisure days for NSWs.
• Targeted interventions addressing sedentary behavior, physical activity, and sleep duration on both workdays and leisure days are crucial for improving NSWs' cardiovascular health.
• NSWs should be conscious of their lifestyle choices to mitigate CVD risks.