• Publications
  • Influence
Coarse-graining spectral analysis: new method for studying heart rate variability.
Heart rate variability (HRV) spectra are typically analyzed for the components related to low- (less than 0.15 Hz) and high- (greater than 0.15 Hz) frequency variations. However, there areExpand
  • 306
  • 26
Autonomic control of heart rate during exercise studied by heart rate variability spectral analysis.
Spectral analysis of heart rate variability (HRV) might provide an index of relative sympathetic (SNS) and parasympathetic nervous system (PNS) activity during exercise. Eight subjects completed sixExpand
  • 329
  • 23
Vasodilation and muscle pump contribution to immediate exercise hyperemia.
A rapid (within 0-5 s) increase in skeletal muscle blood flow has been demonstrated following muscle contraction, yet the mechanism remains unresolved. Recently, it was suggested that the entireExpand
  • 193
  • 21
Acceleration of VO2 kinetics in heavy submaximal exercise by hyperoxia and prior high-intensity exercise.
We examined the hypothesis that O2 uptake (VO2) would change more rapidly at the onset of step work rate transitions in exercise with hyperoxic gas breathing and after prior high-intensity exercise.Expand
  • 274
  • 18
Delayed kinetics of respiratory gas exchange in the transition from prior exercise.
The kinetics of oxygen uptake (VO2), carbon dioxide output (VCO2), and expired ventilation (VE) in the transition from rest or from prior exercise were studied in response to step increases in powerExpand
  • 144
  • 18
Progressive effect of endurance training on VO2 kinetics at the onset of submaximal exercise.
The rates of increase in O2 uptake (VO2) after step changes in work rate from 25 W to 60% of pretraining peak VO2 (VO2 peak) were measured at various times during an endurance training program (2Expand
  • 188
  • 18
Alveolar oxygen uptake and femoral artery blood flow dynamics in upright and supine leg exercise in humans.
We tested the hypothesis that the slower increase in alveolar oxygen uptake (VO2) at the onset of supine, compared with upright, exercise would be accompanied by a slower rate of increase in legExpand
  • 193
  • 16
Effect of acute sympathetic nervous system activation on flow-mediated dilation of brachial artery.
We tested the hypothesis that flow-mediated dilation (FMD) of the brachial artery would be impaired by acute increases in sympathetic nervous system activity (SNA) in models where similar peak shearExpand
  • 113
  • 16
Methodology of spontaneous baroreflex relationship assessed by surrogate data analysis.
We tested the hypothesis that the spontaneous beat-by-beat interactions of systolic blood pressure (SBP) and R-R interval reflected true baroreflex events rather than chance interactions. OriginalExpand
  • 139
  • 15
Interaction of factors determining oxygen uptake at the onset of exercise.
Considerable debate surrounds the issue of whether the rate of adaptation of skeletal muscle O2 consumption (QO2) at the onset of exercise is limited by 1) the inertia of intrinsic cellular metabolicExpand
  • 256
  • 13