Postexercise arterial occlusion maintained the exercise-induced decrease in superficial vein cross-sectional area and increase in mean arterial pressure during recovery (p < 0.05).
Does selective stimulation of muscle metaboreceptors via postexercise arterial occlusion affect superficial venous vascular response in the resting limb?
Sympathoexcitation via muscle metaboreflex may contribute to exercise-induced constriction of superficial veins in the resting limb.
p-value: p=<0.05
Superficial venous vascular response to exercise is mediated sympathetically, although the mechanism is not fully understood. We examined whether sympathetic activation via muscle metaboreflex plays a role in the control of a superficial vein in the contralateral resting limb during exercise. The experimental condition involved selective stimulation of muscle metaboreceptors: 12 subjects performed static handgrip exercises at 45% maximal voluntary contraction for 1.5 min followed by a recovery period with arterial occlusion of the exercise arm (OCCL). For the control condition (CONT), the same exercise protocol was performed except that the recovery period occurred without arterial occlusion. Heart rate (HR) and mean arterial blood pressure (MAP) were measured. The cross-sectional area of the basilic superficial vein (CSAvein) and blood velocity (Vvein) in the resting upper arm were measured by ultrasound while the cuff on resting upper arm was inflated constantly to a subdiastolic pressure of 50 mm Hg. Basilic vein blood flow (BFvein) was calculated as CSAvein × Vvein. During exercise under both OCCL and CONT, HR and MAP increased (p < 0.05), while CSAvein decreased (p < 0.05). During recovery under OCCL, HR returned to baseline, but the exercise-induced increase in MAP and decrease in CSAvein were maintained (p < 0.05). During recovery under CONT, HR, MAP, and CSAvein returned to baseline. BFvein did not change during exercise or recovery under either condition. These results suggest that sympathoexcitation via muscle metaboreflex may be one of the factors responsible for exercise-induced constriction of the superficial veins per se in the resting limb.
Ooue et al. (Wed,) reported a other. Static handgrip exercise with postexercise arterial occlusion vs. Static handgrip exercise without postexercise arterial occlusion was evaluated on Cross-sectional area of the basilic superficial vein (CSAvein) and mean arterial blood pressure (MAP) during recovery (p=<0.05). Postexercise arterial occlusion maintained the exercise-induced decrease in superficial vein cross-sectional area and increase in mean arterial pressure during recovery (p < 0.05).