Cardiovascular and hormonal responses to static handgrip in young and older healthy men

被引:20
|
作者
Krzeminski, K. [1 ]
Cybulski, G. [1 ]
Ziemba, A. [1 ]
Nazar, K. [1 ]
机构
[1] Polish Acad Sci, Dept Appl Physiol, Mossakowski Med Res Ctr, PL-02106 Warsaw, Poland
关键词
Aging; Exercise; Catecholamines; Adrenomedullin; Endothelin; 1; Plasma renin activity; Hemodynamics; Systolic time intervals; SYSTOLIC-TIME INTERVALS; PLASMA ADRENOMEDULLIN CONCENTRATION; ISOMETRIC-EXERCISE; NITRIC-OXIDE; HEART-FAILURE; VENTRICULAR FUNCTION; ENDOTHELIAL FUNCTION; ALDOSTERONE SYSTEM; CONSCIOUS SHEEP; BLOOD-PRESSURE;
D O I
10.1007/s00421-011-2069-y
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The purpose of this study was to investigate the effect of age on cardiovascular changes and plasma concentrations of adrenomedullin (ADM), catecholamines, endothelin-1 (ET-1) and plasma renin activity (PRA) in healthy men. A total of 15 young (21 +/- A 0.3 years) and 15 older (64 +/- A 0.7 years) healthy men performed two 3-min bouts of static handgrip at 30% of maximal voluntary contraction, alternately with each hand without any break between the bouts. During exercise heart rate (HR), blood pressure (BP), stroke volume (SV) and pre-ejection period (PEP) and left ventricle ejection time (LVET) were measured. Blood samples were taken before exercise, at the end of both exercise bouts and in the fifth minute of the recovery period. The handgrip-induced increases in HR and cardiac output were significantly smaller in older than in young men (p < 0.01). SV decreased only in older men (p < 0.001). There were no differences between groups in BP increases. The baseline plasma ADM and catecholamines were higher in older man compared to young subjects. Handgrip caused increases in plasma ADM, ET-1 and PRA only in older men (p < 0.05). The increases in plasma ADM correlated positively with those of noradrenaline (NA), PRA, ET-1 and LVET and negatively with changes in total peripheral resistance (TPR), SV, PEP and PEP/LVET ratio. The increases in plasma ET-1 correlated positively with those of NA, PRA, TPR, mean BP and SV. These results revealed that ADM, ET-1 and angiotensin II can contribute to maintain vascular tone during static exercise in older but not in younger men.
引用
收藏
页码:1315 / 1325
页数:11
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