Cardiac acceleration as a marker of vagal withdrawal in heart rate control during exercise in humans

S. S I Bokharil, H. R. Ahmad, M. M F Subhan, S. A. Ali, M. N. Kahan

Research output: Contribution to journalArticle

Abstract

Objective: To investigate whether the time rate of change in heart rate i.e. cardiac acceleration, during aerobic exercise in human subjects could be used to differentiate vagal withdrawal from sympathetic stimulation. Methods: Fifteen male subjects exercised on a bicycle ergometer at 50 Watts (Step 1), then 100 Watts (Step 2), for 2 minutes each. Results: Heart rate (HR) was monitored from a resting value (mean ± SD) of 80.3 ± 12.9 to 113. 6 ± 13.6 beats min-1 in Step 1. In Step 2 exercise, HR increased from 113.8 ± 13.6 to 145 ± 20 beats min-1. At the initiation of Step 1, a rapid acceleration of HR was observed in the form of an overshoot response. In contrast to Step 1, a small overshoot response of cardiac acceleration was observed during Step 2. The difference between the mean cardiac acceleration at 10 seconds in Steps 1 and 2 was significant (2.40 ± 0.19 and 0.71 ± 0.12 beats min-1 sec-1, p

Original languageEnglish
Pages (from-to)375-378
Number of pages4
JournalJournal of the Pakistan Medical Association
Volume53
Issue number8
Publication statusPublished - 2003
Externally publishedYes

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Cardiac acceleration as a marker of vagal withdrawal in heart rate control during exercise in humans. / Bokharil, S. S I; Ahmad, H. R.; Subhan, M. M F; Ali, S. A.; Kahan, M. N.

In: Journal of the Pakistan Medical Association, Vol. 53, No. 8, 2003, p. 375-378.

Research output: Contribution to journalArticle

Bokharil, S. S I ; Ahmad, H. R. ; Subhan, M. M F ; Ali, S. A. ; Kahan, M. N. / Cardiac acceleration as a marker of vagal withdrawal in heart rate control during exercise in humans. In: Journal of the Pakistan Medical Association. 2003 ; Vol. 53, No. 8. pp. 375-378.
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