Body Composition of Medical Staff Working on Shift Duty and Day Duty: A Cross-sectional Study

Abstract

Introduction: The necessity for 24-hour patient care in the medical field often requires staff to work in shifts, disrupting their circadian rhythms controlled by the hypothalamus’s Suprachiasmatic Nuclei (SCN). This disruption can lead to sleep deprivation, which is linked to significant health issues such as obesity, type 2 diabetes, hypertension, and cardiovascular disease. Sleep deprivation affects body composition by altering fat distribution, muscle mass, and Body Mass Index (BMI), and changes meal preferences towards high-calorie, carbohydraterich foods. Irregular eating patterns due to hormonal and gut microbiome changes can lead to over-eating and weight gain. The sedentary nature of many shift-based jobs exacerbates the imbalance between energy intake and expenditure, promoting obesity. Aim: To address the limited research on how shift work impacts the body composition of medical staff by comparing those on shift duty to those on day duty. Materials and Methods: This study was a cross-sectional study that included medical staff between the age group of 25 to 40 years working in the Parent Institute. The subjects were divided into two equal groups consisting of 100 staff working on shift duty (study group) and 100 staff working on day duty (control group). Subjects were tested for body composition by using Karada Scan. Various parameters of body composition were compared using an unpaired t-test. Results: The day duty group consisted of 36 females and 64 males (N=100) staff with a mean age of 33.0±4.6 years while the shift duty group consisted of 36 females and 64 males (N=100) staff with a mean age of 31.9±4.4 years. The study suggests a significant difference between the two groups for BMI, skeletal muscle mass, and subcutaneous fat with a p-value <0.05. Conclusion: The study showed lower skeletal muscle mass and higher body weight, body fat percentage, visceral fat, BMI, and subcutaneous fat in medical staff working on shift duty.