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NCT Number: NCT07702344

Circadian Rhythm and Health in Heavy Industry Shift Workers

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

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Key information

Conditions

Shift Work Disorder Muscular Diseases Musculoskeletal Diseases Musculoskeletal Pain Neurologic Manifestations Pain Pathological Conditions, Signs and Symptoms Shift Work Type Circadian Rhythm Sleep Disorder Signs and Symptoms

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Istanbul Gedik University

Istanbul, Turkey (Türkiye)

Location status: Recruiting

Location contact

Amine Ataç, PhD

CONTACT

[email protected]

+905454809549

Who can participate

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

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

Exclusion criteria

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

Treatment and study plan

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.

Primary outcomes

  1. Morningness-Eveningness Questionnaire (MEQ)

    Time frame: At enrollment (single assessment)

    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.

Secondary outcomes

  1. Cornell Musculoskeletal Discomfort Questionnaire (CMDQ)

    Time frame: At enrollment (single assessment)

    The Cornell Musculoskeletal Discomfort Questionnaire (CMDQ) is a validated self-administered questionnaire used to assess the frequency, severity, and work-related impact of musculoskeletal discomfort in different body regions. The total score is calculated by summing weighted scores across body regions and does not have a fixed minimum or maximum value. Higher scores indicate greater musculoskeletal discomfort.

  2. Pittsburgh Sleep Quality Index (PSQI)

    Time frame: At enrollment (single assessment)

    The Pittsburgh Sleep Quality Index (PSQI) is a validated self-administered questionnaire used to evaluate sleep quality over the previous month. Total scores range from 0 to 21, with higher scores indicating poorer sleep quality.

  3. World Health Organization Quality of Life-BREF (WHOQOL-BREF)

    Time frame: At enrollment (single assessment)

    The World Health Organization Quality of Life-BREF (WHOQOL-BREF) is a validated self-administered questionnaire that assesses quality of life across the physical, psychological, social, and environmental domains. Domain scores are transformed to a 0-100 scale, with higher scores indicating better quality of life.

Study contacts

Contact information is provided by the study sponsor or research team.

Amine Ataç, PhD

CONTACT

[email protected]

+905454809549

Sponsors and collaborators

Lead sponsor

Istanbul Gedik University

Other

Registry information

Official study title

Investigation of Circadian Rhythm, Musculoskeletal Pain, Sleep Quality, and Quality of Life Among Heavy Industry Shift Workers: A Cross-Sectional Study

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Jul 14, 2026
Registry last updated
Jul 21, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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