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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.

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.

Last updated: Jul 16, 2026•1 RCTs•📖 Read as article →

Evidence Score

Evidence Score44/100
Human RCT★★☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Circadian phenotype is associated with diurnal variation in human exercise performance.

observational

Singh A, Ahmed S, Hesketh SJ · European journal of applied physiology (2026)

Participants: N/A
Duration: crossover protocol (two testing sessions)
Intervention: Morning (08:00-09:00) vs. evening (17:00-18:00) 10-min cycling time trial
Outcome: Mean power, peak power, distance covered, heart rate, blood lactate, perceived exertion, core temperature
Effect Size: r=-0.47 for chronotype, r=0.52 for sleep midpoint
Population: 24 healthy young adults (12 male, 12 female)

Result:

PubMed: 42455307DOI: 10.1007/s00421-026-06352-0

Mechanism Graph

Circadian phenotype assessed via Composite Morningness Questionnaire and actigraphy
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Evening testing time associated with higher core temperature
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Higher core temperature did not explain performance differences
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Evening performance superior to morning performance

Limitations

  • ⚠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.

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References

  1. 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
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.