Shift Work and Risk of Cardio-vascular Disease

Impact of Shift Work on Risk of Cardiovascular Disease and Diabetes: A Cross-sectional Study

The purpose of this research is to test the hypothesis that those with non-traditional work schedules (e.g. shift workers) have a higher cardio-metabolic risk than those with traditional work schedules (e.g. day workers), and that both accumulated sleep debt and the degree of circadian disruption predict the elevated cardio-metabolic risk. The findings of this research are expected to increase our understanding of physiologic tolerance to non-traditional work schedules and provide the basis for the development of methods for the early detection of adverse health effects and determine coping strategies for the millions of workers with non-traditional work schedules.

Study Overview

• Status: Completed
• Conditions: Shift-Work Sleep Disorder
• Intervention / Treatment: Other: Sleep, Dietary and Cardio-metabolic Measurements

• Study Type: Observational
• Enrollment (Actual): 86

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes

• Sampling Method: Non-Probability Sample

Study Population

Healthy adult volunteers.

Description

Inclusion Criteria:

Age 18 and older Full-time workers- working between 7:00 a.m. and 7:00 p.m. employed full time at a medical center.

Non-traditional full-time workers- working between 7:00 a.m. and 7:00 p.m and between 7:00 p.m. and 7:00 a.m., employed full time at a medical center.

Exclusion criteria include:

Acute illness or recent change in medication. Persons employed for less than 3 months at their current job

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Study Plan

How is the study designed?

Number of groups / cohorts

2

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Traditional workers; Individuals who work 'traditional" work hours, i.e., 9a-5p.	Other: Sleep, Dietary and Cardio-metabolic Measurements; At home session: 2-weeks of wrist actigraphy and sleep diaries; a food diary for the three days preceding the lab session; 24-h period of ambulatory blood pressure on a non-work day for participant. Work schedules over a 4-week period will be collected and participants identified as traditional or non-traditional workers. Subjects will begin the stay in the research unit in the evening and will remain for about 16-20 hr. Saliva samples will be taken every 30 min from admission until bedtime. Bedtime with polysomnography will be from 11:00pm to 7:00am. Questionnaires will be administered; height, weight and waist/hip circumference and bioimpedance measurement; standard 3-h oral glucose tolerance test and blood tests (CBC, electrolytes, renal, liver and thyroid function , hemoglobin A1c, SHBG levels). For individuals with diabetes only fasting blood samples will be taken.
Non-traditional workers; Individuals who have work hours outside the usual daytime period	Other: Sleep, Dietary and Cardio-metabolic Measurements; At home session: 2-weeks of wrist actigraphy and sleep diaries; a food diary for the three days preceding the lab session; 24-h period of ambulatory blood pressure on a non-work day for participant. Work schedules over a 4-week period will be collected and participants identified as traditional or non-traditional workers. Subjects will begin the stay in the research unit in the evening and will remain for about 16-20 hr. Saliva samples will be taken every 30 min from admission until bedtime. Bedtime with polysomnography will be from 11:00pm to 7:00am. Questionnaires will be administered; height, weight and waist/hip circumference and bioimpedance measurement; standard 3-h oral glucose tolerance test and blood tests (CBC, electrolytes, renal, liver and thyroid function , hemoglobin A1c, SHBG levels). For individuals with diabetes only fasting blood samples will be taken.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
cardio-metabolic risk	24-h ambulatory blood pressure monitoring and 3-h oral glucose tolerance test	Once

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Obesity	height, weight, BMI and waist/hip circumference and bioimpedance measurement of body fat	Once

Collaborators and Investigators

• Sponsor: University of Chicago

Study record dates

Study Major Dates

• Study Start: January 1, 2012
• Primary Completion (Actual): December 1, 2014
• Study Completion (Actual): December 1, 2014

Study Registration Dates

• First Submitted: July 25, 2016
• First Submitted That Met QC Criteria: September 9, 2016
• First Posted (Estimated): September 15, 2016

Study Record Updates

• Last Update Posted (Actual): June 2, 2023
• Last Update Submitted That Met QC Criteria: June 1, 2023
• Last Verified: June 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Mental Disorders; Nervous System Diseases; Dyssomnias; Neurologic Manifestations; Occupational Diseases; Chronobiology Disorders; Sleep Wake Disorders; Sleep Disorders, Circadian Rhythm
• Other Study ID Numbers: 11-0725