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Influences of physical training on the heart of dogsTo investigate the effects of physical training on cardiac dimensions and function, eight dogs were exercised for 12 weeks by treadmill running 1 hour/day, 5 days/week. Five dogs were confined in cages as controls for an 8-week period. Heart rates were monitored by telemetry during rest and exercise. Maximum QRS spatial magnitudes were calculated from records of McFee lead electrocardiograms. Left ventricular end-diastolic dimensions were determined radiographically by the bead and clip technique. Training produced statistically significant decreases in heart rate at rest and at a standard work load of 6.1 mph on a level treadmill and statistically significant increases in work load at a standard heart rate of 194 beats/min. Improvements were rapid during the first 4 weeks of training but gradual during the remaining 8 weeks. Training caused small but statistically significant increases in left ventricular end-diastolic wall thickness, estimated left ventricular mass, and maximum QRS spatial magnitude.
Document ID
19750033593
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wyatt, H. L.
(Cedars-Sinai Medical Research Institute Los Angeles, Calif., United States)
Mitchell, J. H.
(Texas, University Dallas, Tex., United States)
Date Acquired
August 8, 2013
Publication Date
December 1, 1974
Publication Information
Publication: Circulation Research
Volume: 35
Subject Category
Life Sciences (General)
Accession Number
75A17665
Funding Number(s)
CONTRACT_GRANT: PHS-HL-06296
CONTRACT_GRANT: NGR-44-012-151
Distribution Limits
Public
Copyright
Other

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