文摘
Blood O2 carrying capacity affects aerobic capacity (VO2max). Patients with type 1 diabetes have a risk for anaemia along with renal impairment, and they often have low VO2max. We investigated whether total haemoglobin mass (tHb-mass) and blood volume (BV) differ in men with type 1 diabetes (T1D, n?=?12) presently without complications and in healthy men (CON, n?=?23) (age-, anthropometry-, physical activity-matched), to seek an explanation for low VO2max. We determined tHb-mass, BV, haemoglobin concentration ([Hb]), and VO2max in T1D and CON. With similar (mean?±?SD) [Hb] (144 vs. 145?g?l?), T1D had lower tHb-mass (10.1?±?1.4 vs. 11.0?±?1.1?g?kg?, P?<?0.05), BV (76.8?±?9.5 vs. 83.5?±?8.3?ml?kg?, P?<?0.05) and VO2max (35.4?±?4.8 vs. 44.9?±?7.5?ml?kg??min?, P?<?0.001) than CON. VO2max correlated with tHb-mass and BV both in T1D (r?=?0.71, P?<?0.01 and 0.67, P?<?0.05, respectively) and CON (r?=?0.54, P?<?0.01 and 0.66, P?<?0.001, respectively), but not with [Hb]. Linear regression slopes were shallower in T1D than CON both between VO2max and tHb-mass (2.4 and 3.6?ml?kg??min? vs. g?kg?, respectively) and VO2max and BV (0.3 and 0.6?ml?kg??min? vs. g?kg?, respectively), indicating that T1D were unable to reach similar VO2max than CON at a given tHb-mass and BV. In conclusion, low tHb-mass and BV partly explained low VO2max in T1D and may provide early and more sensitive markers of blood O2 carrying capacity than [Hb] alone.