Evening endurance exercise performance is superior to morning performance, and circadian phenotype is associated with the magnitude of this diurnal variation.
In 24 healthy young adults, a 10-min cycling time trial showed significantly higher mean power, peak power, and distance covered in the evening (17:00-18:00) compared to morning (08:00-09:00). Chronotype and sleep midpoint accounted for 22% and 27% of the variance in the morning-evening performance difference, respectively.
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Evening endurance exercise performance is superior to morning performance, and circadian phenotype is associated with the magnitude of this diurnal variation. The current body of evidence comprises 1 study, including 1 randomized controlled trial. EvidenceHub rates the overall confidence at 44/100 (low).
The Claim
Evening endurance exercise performance is superior to morning performance, and circadian phenotype is associated with the magnitude of this diurnal variation.
This conclusion is most relevant to: 24 healthy young adults (12 male, 12 female).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Circadian phenotype is associated with diurnal variation in human exercise performance. (European journal of applied physiology, 2026) —
How It Works
The proposed biological pathway:
- ▸Circadian phenotype assessed via Composite Morningness Questionnaire and actigraphy
- ▸Evening testing time associated with higher core temperature
- ▸Higher core temperature did not explain performance differences
- ▸Evening performance superior to morning performance
Who Might Benefit
Evidence fit by population:
- ▸24 healthy young adults (12 male, 12 female)
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Small sample size (n=24) limits generalizability
- ▸Crossover design may have order effects not fully accounted for
- ▸Only one exercise modality (cycling) was tested
Frequently Asked Questions
What is the main finding of this study?▼
Endurance exercise performance is significantly better in the evening than in the morning, and individual differences in chronotype and sleep timing predict how large this difference is.
How was circadian phenotype measured?▼
Circadian phenotype was characterized using the Composite Morningness Questionnaire and 7-day actigraphy to determine chronotype and sleep midpoint.
Did physiological strain differ between morning and evening trials?▼
No, heart rate, blood lactate, and perceived exertion were similar between conditions, indicating comparable physiological strain despite performance differences.
Should athletes consider time of day for training?▼
Yes, the study suggests that time-of-day and circadian phenotype should be considered when optimizing exercise testing and prescription.
References
- 1.Singh A, Ahmed S, Hesketh SJ. “Circadian phenotype is associated with diurnal variation in human exercise performance..” European journal of applied physiology, 2026. PMID: 42455307 DOI: 10.1007/s00421-026-06352-0