Diminished baroreflex control of forearm vascular resistance following training.

摘要: The stimulus-response characteristics of cardiopulmonary baroreflex control forearm vascular resistance (FVR units in mm Hg.min.100 ml.ml-1) were studied 14 volunteers before and after 10 wk endurance training. We assessed the relationship between reflex stimulus (changes central venous pressure, CVP) response (FVR) during unloading baroreceptors with lower body negative pressure (LBNP, 0 to -20 Hg). Changes CVP LBNP estimated from changes a large peripheral vein dependent arm subject right lateral decubitus position. Maximal oxygen uptake (VO2max) total blood volume increased training 37.8 +/- 1.4 ml.min-1.kg-1 63.6 2.1 ml.kg-1 45.3 69.3 2.8 ml.kg-1, respectively (P less than 0.05). Reflex vasoconstriction occurred reduction CVP, absolute change FVR per unit was reduced -5.96 0.79 -4.06 0.52 units.mm Hg-1 0.05) following exercise but unchanged -6.10 0.57 -6.22 0.94 for time group (N = 7). Resting values similar training; however, resting elevated 9.5 0.5 Hg 11.3 0.6 training.(ABSTRACT TRUNCATED AT 250 WORDS)