Effects of Sleep Loss on Endothelial Function and Cytokine Levels in Internal Medicine Residents

March 19, 2007 updated by: Yale University
Work requirements for medical trainees result in substantial sleep loss. Sleep loss has been associated with increased levels of certain inflammatory hormones that could have negative impact on blood vessel function. The purpose of this study is to determine the effects of sleep loss on blood hormone levels and blood vessel function in medical trainees.

Study Overview

Status

Completed

Conditions

Detailed Description

Context: Sleep loss is associated with increased blood levels of interleukin-6 (IL-6) and C-reactive protein (CRP). Medical residents are often deprived of normal sleep during extended work shifts, but the effects of work-related sleep loss on biomarkers of vascular inflammation and function are unknown.

Objective: We sought to test the hypothesis that sleep loss during extended work shifts during medical training is associated with increased circulating levels of pro-inflammatory biomarkers and evidence of vascular dysfunction.

Design: Outcome measures were assessed after extended 30-hour work shifts and non-extended 6-hour work shifts in a single-blind, randomized crossover design.

Setting: University hospital medical intensive care unit

Patients or Other Participants: Twenty-two healthy medical residents were studied during a medical intensive care unit rotation.

Main Outcome Measure(s): Sleep related cytokines (interleukin-6 and tumor necrosis factor), serum markers of vascular inflammation (C-reactive protein), and flow-mediated dilation in the brachial artery.

Study Type

Observational

Enrollment

22

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Connecticut
      • New Haven, Connecticut, United States, 06510
        • Yale University School Of Medicine

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 40 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Medical resident in MICU rotation
  • Non-smoker
  • Body mass index <28 kg/m2

Exclusion Criteria:

  • Systolic blood pressure >140 mmHg; Diastolic blood pressure >90 mmHg
  • Known history of diabetes mellitus, hypertension, hyperlipidemia
  • Known history of acute or chronic inflammatory or infectious disease
  • Known history of sleep disturbance unrelated to work
  • Pregnancy

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Yale University

Collaborators

National Heart, Lung, and Blood Institute (NHLBI)
National Center for Research Resources (NCRR)

Investigators

  • Principal Investigator: Stuart D Katz, MD, Yale University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

December 1, 2004

Study Completion

June 1, 2005

Study Registration Dates

First Submitted

January 3, 2006

First Submitted That Met QC Criteria

January 3, 2006

First Posted (Estimate)

January 4, 2006

Study Record Updates

Last Update Posted (Estimate)

March 20, 2007

Last Update Submitted That Met QC Criteria

March 19, 2007

Last Verified

January 1, 2006

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • HIC26414
  • NIH NHLBI K24 04024

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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