Early chronotype with metabolic syndrome favours resting and exercise fat oxidation in relation to insulin‐stimulated non‐oxidative glucose disposal
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New Findings: What is the central question of this study? Chronotype reflects differences in circadian‐mediated metabolic and hormonal profiles. But, does resting and/or exercise fuel use differ in early versus late chronotype as it relates to insulin sensitivity? What are the main finding and its importance? Early chronotypes with metabolic syndrome utilized more fat during rest and exercise independent of aerobic fitness when compared with late chronotypes. Early chronotypes were also more physically active throughout the day. Greater fat use was related to non‐oxidative glucose disposal. These findings suggest that early chronotypes have differences in fuel selection that associate with type 2 diabetes risk. Early chronotypes (ECs) are often insulin‐sensitive, in part, due to physical activity behaviour. It is unclear, however, if chronotypes differ in resting and/or exercise fuel oxidation in relation to insulin action. Using the Morningness–Eveningness Questionnaire (MEQ), adults with metabolic syndrome (ATP III criteria) were classified as EC (MEQ = 63.7 ± 0.9, n = 24 (19F), 54.2 ± 1.2 years) or late chronotype (LC; MEQ = 47.2 ± 1.4, n = 27 (23F), 55.3 ± 1.5 years). Carbohydrate (CHO) and fat oxidation (FOX, indirect calorimetry) were determined at rest, 55% and 85% , along with heart rate and rating of perceived exertion. Physical activity patterns (accelerometers), body composition (DXA) and insulin sensitivity (clamp, 40 mU/m 2/min, 90 mg/dl) with an indirect calorimetry for non‐oxidative glucose disposal (NOGD) were also determined. While demographics were similar, ECs had higher (P = 0.02), NOGD (P < 0.001) and resting FOX (P = 0.02) than LCs. Both groups increased CHO reliance during exercise at 55% and 85% (test effect, P < 0.01) from rest, although ECs used more fat (group effect, P < 0.01). ECs had lower sedentary behaviour and more physical activity during morning/midday (both, P < 0.05). FOX at 55% correlated with (r = 0.425, P = 0.004) whereas FOX at 85% related to NOGD (r = 0.392, P = 0.022). ECs with metabolic syndrome used more fat in relation to insulin‐stimulated NOGD.
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The evening chronotype has been linked to greater risk of depression and anxiety, greater dietary energy density, reduced physical activity, and lower cardiorespiratory fitness.
“Importantly, the evening chronotype has been linked to greater risk of depression and anxiety, 25 greater dietary energy density, 26 as well as reduced physical activity and lower cardiorespiratory fitness, 27”
From The effects of sleep disruption on metabolism, hunger, and satiety, and the influence of psychosocial stress and exercise: A narrative review (2024) · cites this paper as [27]
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- Authors
- Malin, S. K., Remchak, M. E., Smith, A. J., Ragland, T. J., Heiston, E. M., & Cheema, U.
- Affiliations
- Rutgers, The State University of New Jersey (US)
- Virginia Commonwealth University (US)
- University of Virginia (US)
- Corresponding author
- Malin, Steven K.
- Venue
- Experimental Physiology
- Publisher
- Wiley
- Published
- 2022-09-19
- Volume
- 107
- Issue
- 11
- Pages
- 1255-1264
- ISSN
- 0958-0670 (ISSN-L)
- 1469-445X
- PMC
- PMC9633545
- OpenAlex
- W4296522606
- Cited by
- 19
- References
- 40
- Citations by year
- 2026: 1 · 2025: 6 · 2024: 6 · 2023: 6
- FWCI
- 2.36
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Experimental Physiology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (RO1‐HL130296)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Keywords
- chronotype, metabolic syndrome, fat oxidation, carbohydrate oxidation, insulin sensitivity, fuel selection, physical activity patterns, sedentary behavior, type 2 diabetes risk, circadian rhythm, glucose disposal, heart rate, rating of perceived exertion, body composition, cardiorespiratory fitness
- MeSH terms
- Adult, Blood Glucose, Diabetes Mellitus, Type 2, Glucose, Humans, Insulin, Insulin Resistance, Exercise, Metabolic Syndrome
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