Novel quantitative phenotypes of exercise training in mouse models

1 Department of Cardiovascular Medicine, University of Oxford, John Radcliffe Hospital; and 2 University Laboratory of Physiology, University of Oxford, Oxford, United Kingdom Submitted 27 September 2005 ; accepted in final form 5 December 2005 Regular physical exercise has beneficial effects in man...

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Veröffentlicht in:American journal of physiology. Regulatory, integrative and comparative physiology integrative and comparative physiology, 2006-04, Vol.290 (4), p.R926-R934
Hauptverfasser: De Bono, J. P, Adlam, D, Paterson, D. J, Channon, K. M
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Sprache:eng
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Zusammenfassung:1 Department of Cardiovascular Medicine, University of Oxford, John Radcliffe Hospital; and 2 University Laboratory of Physiology, University of Oxford, Oxford, United Kingdom Submitted 27 September 2005 ; accepted in final form 5 December 2005 Regular physical exercise has beneficial effects in many human disease states, including cardiovascular diseases, cancer, and depression. Exercise training of genetically modified mouse models may provide insight into the molecular mechanisms that underlie the beneficial effects of exercise. Presently, there is relatively little understanding of the normal physiology of mouse exercise. In this paper, we describe a novel computerized voluntary wheel-running system capable of recording and analyzing individual wheel rotations. Using this system, we demonstrate that C57BL/6 mice run considerable distances during the night in short bouts and at a preferred speed: the cruising speed. We find that the vast majority of running occurs around this cruising speed, which is close to the maximum speed at which the animal can run but is significantly higher than the average speeds recorded by simple digital odometers. We describe how these parameters vary with exercise training and demonstrate marked sex differences in the patterns of voluntary exercise. The results of this study have important implications for the design and interpretation of both voluntary and forced exercise experiments in mouse models. The novel parameters described provide more physiological quantitative measures of voluntary exercise activity and training and will extend the physiological utility of exercise training as a phenotyping tool in genetic mouse models. voluntary exercise; computerized monitoring; circadian rhythm; physiological hypertrophy Address for reprint requests and other correspondence: K. M. Channon, Dept. of Cardiovascular Medicine, Univ. of Oxford, Level 5, John Radcliffe Hospital, Oxford OX3 9DU, UK (e-mail: keith.channon{at}cardiov.ox.ac.uk )
ISSN:0363-6119
1522-1490
DOI:10.1152/ajpregu.00694.2005