Exercise elicits phase shifts and acute alterations of melatonin that vary with circadian phase.

@article{Buxton2003ExerciseEP,
  title={Exercise elicits phase shifts and acute alterations of melatonin that vary with circadian phase.},
  author={Orfeu M. Buxton and Calvin W Lee and Mireille L’Hermite-Bal{\'e}riaux and Fred W. Turek and Eve van Cauter},
  journal={American journal of physiology. Regulatory, integrative and comparative physiology},
  year={2003},
  volume={284 3},
  pages={
          R714-24
        }
}
To examine the immediate phase-shifting effects of high-intensity exercise of a practical duration (1 h) on human circadian phase, five groups of healthy men 20-30 yr of age participated in studies involving no exercise or exposure to morning, afternoon, evening, or nocturnal exercise. Except during scheduled sleep/dark and exercise periods, subjects remained under modified constant routine conditions allowing a sleep period and including constant posture, knowledge of clock time, and exposure… 
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