Ploutz L L, Tatro D L, Dudley G A, Convertino V A
Bionetics Corporation, Florida.
Clin Physiol. 1993 Jul;13(4):429-38. doi: 10.1111/j.1475-097x.1993.tb00342.x.
The dynamics of change in plasma volume (PV) and baroreflex responses have been reported over 24 h immediately following maximal cycle exercise. The purpose of this study was to determine if PV and baroreflex showed similar changes for 24 h after resistance exercise. Eight men were studied on 2 test days, 1 week apart. On 1 day, per cent change (% delta) in PV was estimated at 0,3, and 6 h after resistance exercise using haematocrit and haemoglobin. Baseline PV was measured 24 h after exercise using Evans blue dye. The carotid baroreceptor-cardiac reflex response was measured before, and 3, 6, 9, 12, and 24 h post-exercise. Each subject performed six sets of the bench press and leg press with 10 repetitions per set with a load that induced failure within each set. On a control day, the protocol was used without exercise. Plasma volume did not change during the control day. There was a 20% decrease in PV immediately post-exercise; the recovery of the PV was rapid and complete within 3 h. PV was 20% greater 24 h post-exercise than on the control day. There were no differences in any of the baroreflex measurements. Therefore, it is suggested that PV shifts may occur without altering baroreflex sensitivity.
最大强度循环运动后24小时内血浆容量（PV）变化的动态情况以及压力反射反应已有相关报道。本研究的目的是确定抗阻运动后24小时内PV和压力反射是否呈现相似变化。8名男性在相隔1周的2个测试日接受研究。在其中1天，使用血细胞比容和血红蛋白评估抗阻运动后0、3和6小时PV的变化百分比（%δ）。运动后24小时使用伊文思蓝染料测量基础PV。在运动前以及运动后3、6、9、12和24小时测量颈动脉压力感受器 - 心脏反射反应。每位受试者进行六组卧推和腿举，每组10次重复，负荷为每组能导致疲劳的重量。在对照日，按照相同方案但不进行运动。对照日期间血浆容量未发生变化。运动后即刻PV下降20%；PV在3小时内迅速且完全恢复。运动后24小时PV比对照日高20%。压力反射的各项测量指标均无差异。因此，提示PV的变化可能在不改变压力反射敏感性的情况下发生。
