Circadian Rhythm and Health in Heavy Industry Shift Workers

NCT07702344 | Recruiting

• 1 other identifier: E-10840098-50.04-3312
• Study Type: observational
• Target: 220
• Locations: 1 country
• Sites: 1

Brief Summary

Shift work can disrupt the body's circadian rhythm, which may negatively affect sleep, musculoskeletal health, and quality of life. Heavy industry workers who perform rotating or night shifts may be particularly vulnerable to these health problems. This cross-sectional observational study will evaluate circadian rhythm characteristics, musculoskeletal pain, sleep quality, and quality of life among heavy industry shift workers. Participants will complete validated questionnaires assessing chronotype, musculoskeletal symptoms, sleep quality, and quality of life. The study will examine the associations between chronotype and these health outcomes and compare the results across different chronotype groups. The findings may contribute to a better understanding of the health effects of shift work and support the development of occupational health strategies for shift workers

Conditions

Shift Work Disorder; Shift Work Type Circadian Rhythm Sleep Disorder

Keywords

Shift Work; Circadian Rhythm; Chronotype; Musculoskeletal pain; Sleeep quality; Quality of life; occupational health

Outcome Measures

Primary Outcomes (1)

• Morningness-Eveningness Questionnaire (MEQ)

  The Morningness-Eveningness Questionnaire (MEQ) is a validated 19-item self-administered questionnaire used to determine an individual's chronotype (morning, intermediate, or evening type). Total scores range from 16 to 86. Higher scores indicate a greater preference for morningness, whereas lower scores indicate a greater preference for eveningness.

  At enrollment (single assessment)

Secondary Outcomes (3)

• Cornell Musculoskeletal Discomfort Questionnaire (CMDQ)

  At enrollment (single assessment)

• Pittsburgh Sleep Quality Index (PSQI)

  At enrollment (single assessment)

• World Health Organization Quality of Life-BREF (WHOQOL-BREF)

  At enrollment (single assessment)

Study Arms (1)

Heavy Industry Shift Workers

Heavy industry workers who perform shift work and will undergo a single questionnaire-based assessment.

Other: Questionnaire-Based Assessment

Interventions

Questionnaire-Based Assessment OTHER

Participants will complete validated self-administered questionnaires to assess chronotype, musculoskeletal pain, sleep quality, and quality of life. No therapeutic intervention will be administered.

Heavy Industry Shift Workers

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

Shift workers: Heavy industry workers employed in a shift work system will be recruited from participating industrial workplaces in İstanbul, Kocaeli in Türkiye. Eligible participants will be adults aged 18 to 65 years who have been working in a rotating or night shift schedule for at least 3 months and are willing to participate in the study.

You may qualify if:

• Ages 18-65
• Working in a shift system for at least 3 months
• Agreeing to participate in the work voluntarily
• Being a shift worker

You may not qualify if:

• Presence of using any medication that may affect alertness or muscle activity

Sponsors & Collaborators

• Istanbul Gedik University: lead

Study Sites (1)

Istanbul Gedik University

Istanbul, Turkey (Türkiye)

RECRUITING

MeSH Terms

Conditions

Musculoskeletal Pain

Condition Hierarchy (Ancestors)

Muscular Diseases; Musculoskeletal Diseases; Pain; Neurologic Manifestations; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Central Study Contacts

Amine Ataç, PhD

CONTACT

+905454809549; amineatac@gmail.com

Study Design

• Study Type: observational
• Observational Model: OTHER
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Asst. Prof.

Study Record Dates

• First Submitted: July 9, 2026
• First Posted: July 14, 2026
• Study Start: July 20, 2026
• Primary Completion (Estimated): September 20, 2026
• Study Completion (Estimated): September 30, 2026
• Last Updated: July 21, 2026

Record last verified: 2026-07

Locations

TU (1)