Key result
Limb venous distension significantly increases sympathetic baroreflex sensitivity and shifts its operating midpoint rightward.
Why the study?
Whether venous distension in legs affects arterial baroreflex and sympathetic baroreflex sensitivity was unknown.
Does limb venous distension alter arterial baroreflex sensitivity in healthy humans?
Does limb venous distension alter arterial baroreflex sensitivity in healthy humans?
p-value: p=<0.001
Venous distension in the limbs alters sympathetic arterial baroreflex function, providing physiological insight into the mechanisms of autonomic regulation during volume shifts.
Offers physiological insight into baroreflex control during volume shifts; leaves open translation to clinical states or disease.
Venous distension in arms evokes sympathetic activation and alters sympathetic baroreflex sensitivity (SBRS). However, whether venous distension in legs affects the arterial baroreflex was unknown. We found that leg venous distension elevated SBRS and shifted the midpoint (T50) of the SBRS curve rightward, which may contribute to the sympathetic activation during venous distension. These findings offer novel insights into the mechanism of autonomic regulation during physiological stresses that can lead to limb venous distension.
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Hamaoka et al. (2025) studied Healthy volunteers (n=20). Limb suction during arterial occlusion (Occlusion and Suction) vs. Arterial occlusion alone without suction was evaluated on Sympathetic baroreflex sensitivity (SBRS) and its midpoint (T50) (p=<0.001). Limb venous distension induced by suction during arterial occlusion significantly increased sympathetic baroreflex sensitivity and shifted the operating midpoint rightward (p<0.001) in healthy subjects.
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