Christensen T, Christensen G
Eur J Appl Physiol Occup Physiol. 1978 Jul 17;39(1):17-25. doi: 10.1007/BF00429675.
Seven male subjects were studied before and up to 53 days after the loss of 11 of blood. The resting hematocrit fell from 44.0 to 38.7% and returned to control level after 3 weeks. Maximal oxygen uptake decreased from 4.00 1/min to 3.54 1/min and returned to the initial level within 2 weeks. Submaximal oxygen uptake, pulmonary ventilation, maximal heart rate and blood lactate were not found to change significantly. Submaximal heart rate was increased from 125 beats . min-1 to about 135 beats . min-1 and remained elevated for 3 weeks, whereas blood lactate was increased only in the first week. Maximal work time decreased from 5.1 min to 3.8 min and remained low for the first 2 weeks, but rose thereafter above the starting level. Comparison with a control study suggested that there is some training effect, which, when allowed for, indicates that maximal work time returns to starting values at the same time as does the maximal oxygen uptake. It is concluded that the drop in Hct, maximal oxygen uptake and work capacity, found after the loss of 11 of blood, are related to each other both in magnitude and duration.
对7名男性受试者在失血11%之前及之后长达53天的时间进行了研究。静息血细胞比容从44.0%降至38.7%，3周后恢复到对照水平。最大摄氧量从4.00升/分钟降至3.54升/分钟，并在2周内恢复到初始水平。未发现次最大摄氧量、肺通气量、最大心率和血乳酸有显著变化。次最大心率从125次/分钟增加到约135次/分钟，并持续升高3周，而血乳酸仅在第一周增加。最大工作时间从5.1分钟降至3.8分钟，并在最初2周保持较低水平，但此后升至起始水平之上。与对照研究相比表明存在一定的训练效应，考虑到这一点后表明最大工作时间与最大摄氧量同时恢复到起始值。得出的结论是，失血11%后发现的血细胞比容、最大摄氧量和工作能力的下降在幅度和持续时间上相互关联。
