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May 10, 2026SLEEP

0260 Chronotype is not Associated with 12-Month Changes in Body Composition or Anthropometrics in Black Emerging Adults: SHOW Study Preliminary Findings

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Why the study?

Black emerging adults have a higher obesity risk, but relationships between chronotype and long-term changes in body weight and composition are poorly understood.

Is chronotype associated with changes in body composition and anthropometrics in Black emerging adults?

Population

Black emerging adults aged 18-28 years with 6-month (n=68) and 12-month (n=44) data

Comparison

Chronotype assessed by baseline Morningness-Eveningness Questionnaire score

Design

Prospective cohort study

Follow-up

12-months

Key result

Chronotype was not significantly associated with changes in body composition in Black emerging adults, but earlier chronotype correlated with decreased fat-free mass in females (r=-0.37, p=0.050).

Authors

HKHannah KochAKAubrey KehoeLWLaurie Wideman

Discussion

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Overview

Sex-specific chronotype links to body composition changes in Black emerging adults should not alter practice; leaves open need for prospective confirmation.

Key Points

  • This analysis aims to determine the relationship between chronotype and changes in body weight and composition over 12 months in Black emerging adults.
  • Recruitment of 150 Black emerging adults aged 18-28.
  • Measurement of chronotype using the Morningness-Eveningness Questionnaire (MEQ) at baseline.
  • Body composition assessed at baseline, 6 months, and 12 months using DXA or Bod Pod.
  • At 6 months, no significant association was found between chronotype and body composition changes in the entire sample.
  • In females, higher MEQ scores correlated with a greater decrease in fat-free mass index (r=-0.37, p=0.050) at 12 months, unlike males (r=0.31, p=0.32).
  • Overall, chronotype did not significantly impact body weight or composition changes in Black emerging adults.

Study Design

Type

Cohort (n=68)

Structured PICO

Is chronotype associated with changes in body composition and anthropometrics in Black emerging adults?

P
Population
68 Black emerging adults (ages 18-28 years), mean age 20.3, 46 females.
I
Intervention
Chronotype assessed by Morningness-Eveningness Questionnaire (MEQ) as a continuous variable
O
Outcome
6- and 12-month changes in body composition (fat mass index and fat-free mass index) and anthropometrics (body weight, waist and hip circumferences)surrogate

Chronotype does not appear to be significantly associated with 12-month changes in body weight or composition in Black emerging adults overall, though sex-specific differences may exist.

Limitations

  • Preliminary findings
  • Exploratory nature of analyses
  • Exploratory analyses

Cite This Study

Koch et al. (2026) conducted a cohort in Obesity risk (n=68). Chronotype (Morningness-Eveningness Questionnaire score) was evaluated on 6- and 12-month changes in body composition and anthropometrics. Chronotype was not significantly associated with changes in body composition in Black emerging adults, but earlier chronotype correlated with decreased fat-free mass in females (r=-0.37, p=0.050).

synapsesocial.com/papers/6a002087c8f74e3340f9b6e4https://doi.org/10.1093/sleep/zsag091.0260
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