Fig. 1

From Fig. 1 in Lundvall et al. [5]. Collected data (mean ± SE; 16 experiments) on arterial haemoconcentration (Hb; percent increase above control) during and after 15 min of quiet standing. Note that Hb showed only moderate increase at the end of the period of standing but a rapid and marked further increase when the supine body position was resumed, signifying that blood collected in the erect posture markedly underestimated the ‘true, overall’ haemoconcentration. (Reproduced with permission)