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已报导受试者预先即使短时间处在头低位,其心血管对下身负压(LBNP)的反应也较大。但是这些研究者没有对相同受试者进行预先处在头低位和没有处在头低位的LBNP 反应的比较。因此不能区别
It has been reported that subjects had a greater cardiovascular response to lower body negative pressure (LBNP), even if they had been in the head-low for short periods of time. However, these investigators did not compare the LBNP response to the same subjects pre-emptively with low and no low head. So can not be distinguished