摘要：Sullivan W, Fisher MM. Arm Position Affects Calculation ofPosture-Induced Versus Jogging-Induced Plasma Volume Change.JEPonline 2018;21(1):116-126. The effect of blood sampling armposition on the calculation of standing-induced versus jogginginducedchange in plasma volume (∆PV) has not been determined.This study examined the effect of arm position on posture-inducedversus jogging-induced ∆PV. Eleven physically active men with amean age of 25.7 ± 5.7 yrs lay supine for 30 min, stood upright for30 min, and then jogged at ~75% of age-predicted maximal heartrate. During the standing rest and exercise, one arm was pendent(Pendent) while the other arm was supported in a position parallel tothe floor (Horizontal). Blood was drawn from both arms at the end ofthe supine and standing rest periods and after ~12 min of exercise.There was an interaction (F1,10 = 10.373, P = 0.009, 2p = 0.509)between arm position and condition on ∆PV. Post hoc paired t testsrevealed a greater ∆PV (t = 2.340, P = 0.041, ES = 1.02, 95% CI ofmean difference = 0.23 to 9.57) in the Pendent arm (-12.9 ± 5.7 %)compared to the Horizontal arm (-8.0 ± 3.8 %) when going from asupine to standing position. When subjects switched from a standingcondition to the jogging condition, PV was greater (t = -2.930, P =0.015, ES = 1.37, 95% CI of mean difference = -12.53 to -1.71) inthe Horizontal arm (-6.2 ± 5.5 %) compared to the Pendent arm (0.9± 4.8 %). There was no difference in ∆PV from the supine conditionthrough the exercise bout (t = 0.223, P = 0.828, ES = 0.10, 95% CIof mean difference = -5.65 to 6.90) between the Pendent (±12.6 +4.4%) and Horizontal (±12.0 + 8.2%) arm. Thus, blood-sampling armposition affects the calculation of posture-induced versus jogginginduced∆PV and should be considered in the experimental design.
