Premium
Blood pressure response during recovery after moderate leg cycling exercise: the role of carotid baroreflex control
Author(s) -
Yamada Masako,
Endo Masako Y,
Fukuba Yoshiyuki
Publication year - 2010
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.24.1_supplement.780.6
Subject(s) - supine position , baroreflex , blood pressure , medicine , peripheral , hemodynamics , cardiology , heart rate , anesthesia
This study was to determine the characteristics of the carotid baroreflex (CBR) control of central and peripheral hemodynamics during the post‐exercise hypotension (PEH) using the neck chamber (NC) technique. 16 healthy young male subjects (age: 27+/−1 yr) undertook 60‐min moderate cycle ergometer exercise, followed by 30‐min of supine rest. Subjects remained at supine rest for a further 60‐min. During pre‐ and post‐exercise, the CBR control of the central (HR) and peripheral (vascular conductance, VC in popliteal and brachial arteries as the previously active and inactive muscles, respectively) circulations was evaluated using 5‐s periods of neck suction and pressure (−60, −40, 0, or +40 Torr). Eight subjects (responder (RE) group) showed substantial PEH during recovery from exercise (ΔBP, ~ −5 Torr; p<0.05). The other subjects (non‐RE group) did not exhibit the PEH but showed a significant post‐exercise CBR argumentation in HR, BP and VC, especially in response to −40, not +40 Torr. However, in RE group, pre‐ and post‐exercise CBR function was unchanged during PEH. Consequently, the subjects without PEH exhibit an augmented CBR control to central and peripheral hemodynamics following exercise ‐ especially to a high fluctuation of BP to the operating point. In conclusion, CBR control is not changed during PEH, while some normotensive individuals do not show the PEH. (Support: JSPS‐KAKENHI, 20700526, 21370111)