TY - JOUR
T1 - Impact of age on aortic wave reflection responses to metaboreflex activation and its relationship with leg lean mass in post-menopausal women
AU - Figueroa, Arturo
AU - Jaime, Salvador J.
AU - Johnson, Sarah A.
AU - Alvarez-Alvarado, Stacey
AU - Campbell, Jeremiah C.
AU - Feresin, Rafaela G.
AU - Elam, Marcus L.
AU - Arjmandi, Bahram H.
N1 - Publisher Copyright:
© 2015 Elsevier Inc.
PY - 2015/10/1
Y1 - 2015/10/1
N2 - Wave reflection (augmentation pressure [AP] and index [AIx]) is greater in older women than men. Resting AP is a better wave reflection index than AIx in older adults. The negative relationship between wave reflection and lean mass (LM) has been inconsistent. We investigated the impact of age and LM on aortic hemodynamic responses to metaboreflex activation in post-menopausal women. Post-menopausal women, younger and older (n = 20 per group) than 60 years, performed 2-min isometric handgrip at 30% of maximal force followed by 3-min post-exercise muscle ischemia (PEMI). We measured carotid-femoral pulse wave velocity (cfPWV) and femoral-ankle PWV (faPWV) at rest, and aortic systolic blood pressure (aSBP), pulse pressure (aPP), AP, AIx, and AIx-adjusted for heart rate (AIx at 75) at rest and during PEMI using tonometry. Arm and leg LM were measured by DEXA. Resting cfPWV, aSBP, and aPP were higher, while AIx at 75 and leg LM were lower in older than younger women. aSBP and aPP increased similarly during PEMI in both groups. Increases in AP (P< 0.05), AIx (P< 0.05), and AIx at 75 (P< 0.01) during PEMI were greater in older than younger women. From these responses, only AP during PEMI was correlated (P< 0.05) positively with aSBP and aPP responses, and negatively with leg LM. Resting faPWV, but not cfPWV, was correlated (P< 0.01) with AP, aSBP, and aPP during PEMI. Therefore, PEMI induces greater wave reflection responses in older than younger post-menopausal women. Our findings suggest that the increased AP response to PEMI is related to leg arterial stiffness and muscle loss in older women.
AB - Wave reflection (augmentation pressure [AP] and index [AIx]) is greater in older women than men. Resting AP is a better wave reflection index than AIx in older adults. The negative relationship between wave reflection and lean mass (LM) has been inconsistent. We investigated the impact of age and LM on aortic hemodynamic responses to metaboreflex activation in post-menopausal women. Post-menopausal women, younger and older (n = 20 per group) than 60 years, performed 2-min isometric handgrip at 30% of maximal force followed by 3-min post-exercise muscle ischemia (PEMI). We measured carotid-femoral pulse wave velocity (cfPWV) and femoral-ankle PWV (faPWV) at rest, and aortic systolic blood pressure (aSBP), pulse pressure (aPP), AP, AIx, and AIx-adjusted for heart rate (AIx at 75) at rest and during PEMI using tonometry. Arm and leg LM were measured by DEXA. Resting cfPWV, aSBP, and aPP were higher, while AIx at 75 and leg LM were lower in older than younger women. aSBP and aPP increased similarly during PEMI in both groups. Increases in AP (P< 0.05), AIx (P< 0.05), and AIx at 75 (P< 0.01) during PEMI were greater in older than younger women. From these responses, only AP during PEMI was correlated (P< 0.05) positively with aSBP and aPP responses, and negatively with leg LM. Resting faPWV, but not cfPWV, was correlated (P< 0.01) with AP, aSBP, and aPP during PEMI. Therefore, PEMI induces greater wave reflection responses in older than younger post-menopausal women. Our findings suggest that the increased AP response to PEMI is related to leg arterial stiffness and muscle loss in older women.
KW - Aortic and leg arterial stiffness
KW - Aortic blood pressure
KW - Hypertension
KW - Leg lean mass
KW - Sarcopenia
KW - Wave reflections
UR - http://www.scopus.com/inward/record.url?scp=84941208129&partnerID=8YFLogxK
U2 - 10.1016/j.exger.2015.07.010
DO - 10.1016/j.exger.2015.07.010
M3 - Article
C2 - 26192974
AN - SCOPUS:84941208129
VL - 70
SP - 119
EP - 124
JO - Experimental Gerontology
JF - Experimental Gerontology
SN - 0531-5565
ER -