One Arm Exercise Induces Significant Inter-arm Diastolic Blood Pressure Difference And Relevant Mechanisms

Objective：To investigate whether an arm exercise induces inter-arm blood pressure differ-ence（IAD）and relevant mechanisms.Methods：This study included50health young persons(male25，female25). The elbowflexion and extension of the right arm had been performed for three minutes. BP oftwo upper-arms was simultaneously measured with two automatic BP measurementdevices before (basic) and immediately (0),5,10,15,20and30min after exercise.The BP of invasive and noninvasive of right-hand was simultaneously measuredin ten patients for coronary angiography before (basic) and immediately (0) and5minafter exercise.The absolute value of the difference of the left and right BP was calculated asthe△BP l-r. The△BP l-r equal or over10mmHg was recognized as inter-arm BPdifference (IAD). The absolute difference in the systolic BP (SBP) and diastolicResults：1. The baseline data of the SBP and DBP in left and right arms revealed nosignificant difference (SBP:110±10vs.111±11mmHg; DBP:66±8vs.66±9mmHg,both not significant).2. At0min, the right arm exercise induced the right DBP decrease（53±9/66±9mmHg) and left DBP increase（72±9/66±8mmHg).3. The prevalence of dIAD was2%at thebaseline. However, this prevalenceincreased to80%at0min, and then the prevalence decreased gradually within a30-min recovery period. The prevalence of sIAD was zero at the baseline and themaximal prevalence was8%during the20-min postexercise period. Conclusions：1. One arm exercise can lead to a significant IAD in DBP.2. Any arm exercise should be avoided before BP measurement. Objective：To investigate the mechanism of hemodynamics for the DBP decrease of theexercised arm.Methods：Ten young males were enrolled to explore the mechanism of post exercisehypotension (PEH) after three minutes elbow flexion and extension exercise of rightarm. The bilateral brachial artery internal diameter (ID) and peak systolic flowvelocity (PSV) and end diastolic flow velocity (EDV) were measured by Dopplertechniques before, immediately and10min after exercise. The absolute difference inthe systolic BP (SBP) and diastolicResults：1. The baseline BP, ID, PSV and EDV, PSFV and EDFV were similar betweentwo arms.2. Although the bilateral PSVs significantly increased immediately after exercise,the PSV was significantly higher in right arm than in left arm (164.1±54.3vs123.3±33.4cm/s, p<0.05).; The PSFV significantly increased in both arm, however,the EDFV increased significantly only in the exercised arm(643.5±219.9vs323.9±81.2ml/s, p<0.05).3. Significant VR decline was only seen in exercised arm, not in non-exercisedarm (0.08±0.04vs0.19±0.06w, p<0.05).Conclusions：The resistance decline of local vascular bed is the responsive factor for the DBPdecrease of the exercised arm.