Cited by 291Circadian rhythm and melatoninSleep and Work-Related FatigueExercise and Physiological Responses

Scheduled exercise phase shifts the circadian clock in skeletal muscle

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WOLFF, GRETCHEN, ESSER, KARYN A.·2012·Medicine & Science in Sports & Exercise

Abstract

PURPOSE: It has been well established in mammals that circadian behavior as well as the molecular clockwork can be synchronized to the light-dark cycle via the suprachiasmatic nucleus of the hypothalamus (SCN). In addition to light, it has been demonstrated that nonphotic time cues, such as restricting the time of food availability, can alter circadian behavior and clock gene expression in selected peripheral tissues such as the liver. Studies have also suggested that scheduled physical activity (exercise) can alter circadian rhythms in behavior and clock gene expression; however, currently, the effects of exercise alone are largely unknown and have not been explored in skeletal muscle. METHODS: Period2::Luciferase (Per2::Luc) mice were maintained under 12 h of light followed by 12 h of darkness then exposed to 2 h of voluntary or involuntary exercise during the light phase for 4 wk. Control mice were left in home cages or moved to the exercise environment (sham). A second group of mice had restricted access to food (4 h · d(-1) for 2 wk) to compare the effects of two nonphotic cues on PER2::LUC bioluminescence. Skeletal muscle, lung, and SCN tissue explants were cultured for 5-6 d to study molecular rhythms. RESULTS: In the exercised mice, the phase of peak PER2::LUC bioluminescence was shifted in the skeletal muscle and lung explants but not in the SCN suggesting a specific synchronizing effect of exercise on the molecular clockwork in peripheral tissues. CONCLUSIONS: These data provide evidence that the molecular circadian clock in peripheral tissues can respond to the time of exercise suggesting that physical activity contributes important timing information for synchronization of circadian clocks throughout the body.

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Authors
WOLFF, G., & ESSER, K. A.
Affiliations
University of Kentucky (US)
Corresponding author
ESSER, KARYN A.
Venue
Medicine & Science in Sports & Exercise
Published
2012-09
Volume
44
Issue
9
Pages
1663-1670
ISSN
0195-9131 (ISSN-L)
OpenAlex
W2033614839
Cited by
291
References
37
Citations by year
2026: 26 · 2025: 31 · 2024: 35 · 2023: 29 · 2022: 33 · 2021: 26 · 2020: 32 · 2019: 18 · 2018: 13 · 2017: 9 · 2016: 20 · 2015: 4 · 2014: 8 · 2013: 5 · 2012: 2
FWCI
2.68
Type
journal article
Language
en
Open access
Locations
  • Medicine & Science in Sports & Exercise (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (submittedVersion)
Funders
  • National Institutes of Health (5t32hl086341-05)
  • National Heart, Lung, and Blood Institute (T32 HL086341-02, T32-HL-086341)
  • National Institute of Environmental Health Sciences (RC1ES018636, ES-018636)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR055246, AR-055246)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
Keywords
circadian clock, skeletal muscle, exercise timing, phase shift, clock gene expression, dietary restriction, suprachiasmatic nucleus, lung, voluntary exercise
MeSH terms
Animals, Circadian Rhythm, Physical Exertion, Female, Luciferases, Male, Mice, Inbred C57BL, Physical Conditioning, Animal, Photoperiod, Muscle, Skeletal, Mice, Circadian Clocks

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