Assessment of heart rate variability in Boxers with XXXX .

@entity4128 @entity712 @entity235 @entity299 @entity943
OBJECTIVE: To assess heart rate variability (HRV) in Boxers with @entity4128 ( @entity4128 ), assess the ability of HRV analysis to identify differences in Boxers on the basis of severity of their @entity943 , and evaluate the use of HRV to determine whether persistently high sympathetic tone is present in these @entity235 . DESIGN: Prospective study. ANIMALS: 24 Boxers with @entity4128 and 10 clinically normal non-Boxer @entity235 . PROCEDURE: Boxers were categorized as @entity235 with @entity712 ( @entity712 ), @entity235 with < or = 2 ventricular premature complexes (VPCs)/24 h (designated unaffected), or @entity235 with > 1,000 VPCs/24 h (designated affected). Ambulatory electrocardiography (24 hours) was performed in each @entity235 . Recordings were analyzed for HRV variables at a commercial laboratory; differences in HRV variables among groups were compared with 1-way ANOVA. RESULTS: Compared with control non-Boxer @entity235 and Boxers without @entity712 (affected and unaffected Boxers), HRV was reduced in Boxers with @entity712 . No differences in HRV variables were detected between affected and unaffected Boxers. Inconsistent differences were identified between the control @entity235 and Boxers without @entity712 that had various degrees of @entity943 . CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that persistently high sympathetic tone is not a consistent feature of @entity4128 . Differences in some HRV variables between Boxers without @entity712 and control @entity235 suggest that Boxers may have different autonomic control of heart rate, compared with that of clinically normal non-Boxer @entity235 . The usefulness of HRV analysis appears limited to Boxers with @entity4128 that have @entity299 and @entity712 .
