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Influence of photoperiod in exercise performance and central nervous system activation
Author(s) -
Machado Frederico Sander Mansur,
Fóscolo Daniela,
Niero Larissa,
Coimbra Candido Celso
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.lb771
Subject(s) - suprachiasmatic nucleus , circadian rhythm , photoperiodism , medicine , endocrinology , treadmill , locus coeruleus , physical exercise , nucleus , neuroscience , chemistry , central nervous system , biology
Aims In the present study, we sought to investigate the relationship between photoperiodic daily fluctuations of internal body temperature (T core ) with physical capacity (Workload) and neuronal activation induced by progressive treadmill exercise test. Methods Animals were subjected to protocols of progressive exercise test (n=11), resting on treadmill (n=12) or without prior manipulation (n=12) during dark and light phases. At the end of the last experimental session, the animals were perfused and the brains removed for immunohistchemical analysis of neuronal activation in the locus coeruleus (LC), paraventricular nucleus (PVN), supra‐optic nucleus (SO) and suprachiasmatic nucleus (SQN). Results Workload was 23% higher in the light phase when compared to dark phase exercise (p<0.001). PVN, SO and LC were strongly activated by exercise until fatigue independent of circadian phase (p<0.001). The SQN was not activated neither by exercise nor time of the day. A strong correlation between the activation of PVN, SO and LC was found only during the dark phase of the photoperiod. Conclusion Thereafter, the time of the day, possibly through its centrally mediated mechanisms favors physical performance during light phase independent of basal spontaneous locomotor activity levels. Besides, the SQN seemed to be resistant to exercise related disturbances. Research sponsored by CAPES, CNPq and FAPEMIG.