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Updated: Aug 23, 2025
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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
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Chronotype and Social Jetlag Influence Performance and Injury during Reserve Officers' Training Corps Physical
Graham R McGinnis1, Shani T Thompson1, Charli D Aguilar1
1Department of Kinesiology and Nutrition Sciences, University of Nevada Las Vegas, 4505 S. Maryland Pkwy, Las Vegas, NV 89154, USA.
International Journal of Environmental Research and Public Health
|October 27, 2022
Summary
Evening chronotypes and social jetlag negatively impact physical performance and increase injury risk in cadets. Understanding these sleep and circadian factors is crucial for optimizing training and preventing musculoskeletal injuries.
Area of Science:
- Sports Medicine
- Sleep Science
- Exercise Physiology
Background:
- Sleep and circadian rhythms are vital for physical performance and health during training.
- Chronotype and sleep disturbances may influence exercise response and musculoskeletal injury risk.
Purpose of the Study:
- To investigate associations between cadet characteristics (chronotype, sleep duration, social jetlag) and injury incidence, inflammation, and physical performance.
- To determine if chronotype, sleep duration, or social jetlag impact salivary IL-6 levels and Army Physical Fitness Test (APFT) scores.
Main Methods:
- 42 Reserve Officers' Training Corps (ROTC) cadets completed chronotype and sleep logs.
- Salivary IL-6 measured pre- and post-exercise; injury incidence monitored over 14 weeks.
- Statistical analyses (ANOVA, chi-squared, t-test) used to assess impacts on IL-6, injury, and APFT scores.
Main Results:
- Evening chronotypes exhibited lower APFT scores (p < 0.05).
- Injured cadets had significantly higher social jetlag compared to uninjured cadets (p < 0.05).
- Sleep duration did not significantly affect APFT scores or injury incidence. Exercise increased IL-6, unaffected by chronotype or social jetlag.
Conclusions:
- Evening chronotypes and social jetlag are linked to impaired performance on morning physical assessments.
- Social jetlag may serve as a potential behavioral biomarker for increased musculoskeletal injury risk in training populations.
- Further research is warranted to explore the relationship between social jetlag and injury prevention strategies.
Keywords:
Reserve Officers’ Training Corpschronotypemilitary trainingmusculoskeletal injurysleepsocial jetlagMore Related Videos
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