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Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
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Evening chronotype predicts dropout of physical exercise: a prospective analysis
Flávio Augustino Back1,2, Adriano Akira Ferreira Hino3, Wilynson Gomes Bojarski1
1Human Chronobiology Laboratory, Department of Physiology, Federal University of Paraná, Curitiba, Paraná Brazil.
Sport Sciences for Health
|June 27, 2022
Summary
Eveningness chronotype is linked to higher dropout risk in exercise programs, while morningness preference may promote adherence. Understanding chronotype can help improve exercise program retention.
Area of Science:
- Chronobiology
- Exercise Science
- Health Psychology
Background:
- Eveningness preference is associated with poorer health outcomes compared to morningness.
- Physical activity may mediate the link between chronotype and health.
- Existing evidence is largely cross-sectional, necessitating longitudinal studies.
Purpose of the Study:
- To investigate if chronotype predicts dropout risk in structured physical exercise programs.
- To identify chronobiological factors influencing adherence to fitness programs.
Main Methods:
- A 12-week prospective study of 153 gym volunteers (18-65 years).
- Objective measurement of exercise frequency via electronic turnstiles.
- Data collection included demographics, health, physical activity, sleep, and chronotype (Morningness-Eveningness Questionnaire - MEQ).
- Cox regression models analyzed dropout risk, controlling for covariates.
Main Results:
- Higher MEQ scores (indicating morningness) were associated with a reduced likelihood of program dropout (HR=0.98; p=0.046).
- Evening-types (E-types) exhibited a significantly higher risk of dropout compared to morning-types (M-types) (HR=2.22; p=0.027).
Conclusions:
- Chronotype is a significant factor influencing adherence to formal exercise programs.
- Early exercise program engagement (Week 1 frequency) and membership duration also warrant further investigation for their role in retention.
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