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J Comp Physiol A

Title:		The effects of running activity on the reproductive axes of rodents
Author(s):		Kerbeshian MC; LePhuoc H; Bronson FH;
Address:		"Department of Zoology, University of Texas, Austin 78712"
Journal Title:		J Comp Physiol A
Year:		1994
Volume:		174
Issue:		6
Page Number:		741 - 746
DOI:		10.1007/BF00192723
ISSN/ISBN:
Abstract:		"Access to a running wheel causes gonadal recrudescence in Syrian hamsters whose reproductive axes have been suppressed by housing them under short day lengths (Borer et al. 1983). The first experiment tested the generality of this phenomenon in a population of rodents that is genetically heterogeneous for reproductive photoresponsiveness. Male meadow voles (Microtus pennsylvanicus) of the two extreme phenotypes--reproductively photoresponsive and non-responsive--were either provided with a running wheel or housed without one. After 4 weeks with a wheel, the responsive voles had recovered full reproductive function, while the reproductive axes of responsive voles housed without wheels remained suppressed. Three experiments queried whether the use of a wheel would have reproductively stimulative effects in other rodents. First, intact male mice given access to wheels showed no increase in testis size when compared to mice housed without wheels. Likewise, locomotor activity had no effect on male rats whose testes were partially regressed in response to testosterone implants or on female mice whose estrous cycles were pheromonally suppressed by housing them in groups. Thus the neuroendocrine pathway used by locomotor activity to enhance the secretion of gonadotropin is specifically allied with the pathway used by photoperiod to control GnRH secretion"
Keywords:		Analysis of Variance Animals Arvicolinae/physiology Estrus/*physiology Female Lighting Male Mice/physiology Motor Activity/*physiology Radioimmunoassay Rats/physiology Rodentia/*physiology Testis/*physiology;
Notes:		"MedlineKerbeshian, M C LePhuoc, H Bronson, F H eng HD 26823/HD/NICHD NIH HHS/ Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Germany 1994/06/01 J Comp Physiol A. 1994 Jun; 174(6):741-6. doi: 10.1007/BF00192723"