Effect of endurance training on cardiac morphology in Alaskan sled dogs

被引:46
作者
Stepien, RL
Hinchcliff, KW
Constable, PD
Olson, J
机构
[1] Univ Wisconsin, Sch Vet Med, Dept Med Sci, Madison, WI 53706 USA
[2] Ohio State Univ, Coll Vet Med, Dept Vet Clin Sci, Columbus, OH 43210 USA
[3] Univ Illinois, Coll Vet Med, Dept Vet Clin Med, Urbana, IL 61802 USA
[4] Raven Vet Clin, N Pole, AK 99705 USA
关键词
left ventricular hypertrophy; echocardiography; athlete's heart; exercise; dog;
D O I
10.1152/jappl.1998.85.4.1368
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The cardiac morphology of 77 conscious Alaskan sled dogs before and after 5 mo of endurance training (20 km/day team pulling a sled and musher) was studied using two-dimensional and M-mode echocardiography. Subgroups included dogs with at least one season of previous training ("veterans") and dogs undergoing their first season of training ("rookies"). Training resulted in a significant (P < 0.05) decrease in resting heart rate(-15%) and significant increases in interventricular septal thickness (systole, 15%; diastole, 13%), left ventricular (LV) internal dimension in diastole (LVIDd, 4%), LV free wall thickness in systole (9%) and diastole (LVWd, 9%), and left atrial diameter (5%) in all dogs, but the increase in LVWd was greater in rookies (16%) than in veterans (7%). Training increased end-diastolic volume index (8%), LV mass index (24%), and heart weight index (24%) and decreased the LVIDd-to-LVWd ratio (-6%) but did not alter cardiac index. We conclude that increased LV mass attributable to LV dilation and hypertrophy is associated with endurance training in Alaskan sled dogs. Disproportionate LV wall thickening accompanying LV dilation suggests that cardiac morphological changes are due to volume and pressure loading. These training-induced changes are similar to those documented in human athletes undergoing combined isometric and isotonic training and differ from studies of dogs trained on treadmills.
引用
收藏
页码:1368 / 1375
页数:8
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