Journal
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Volume 105, Issue 3, Pages 471-481Publisher
SPRINGER
DOI: 10.1007/s00421-008-0925-1
Keywords
Heart rate recovery; Heart rate variability; Plasma volume expansion; Supramaximal training
Categories
Ask authors/readers for more resources
The purpose of this study was to investigate the effect of exercise-induced plasma volume expansion on post-exercise parasympathetic reactivation. Before (D-0) and 2 days after (D+2) a supramaximal exercise session, 11 men (21.4 +/- A 2.6 years and BMI = 23.0 +/- A 1.4) performed 6-min of submaximal running where heart rate (HR) recovery (HRR) and HR variability (HRV) indices were calculated during the first 10 min of recovery. Relative plasma volume changes (a dagger PV) were calculated using changes in hematocrit and hemoglobin measured over consecutive mornings from D-0 to D+2. Parasympathetic reactivation was evaluated through HRR and vagal-related indexes calculated during a stationary period of recovery. Compared with D-0, a dagger PV (+4.8%, P < 0.01) and all vagal-related HRV indices were significantly higher at D+2 (all P < 0.05). HRR was not different between trials. Changes in HRV indices, but not HRR, were related to a dagger PV (all P < 0.01). HRR and HRV indices characterize distinct independent aspects of cardiac parasympathetic function, with HRV indices being more sensitive to changes in plasma volume than HRR.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available