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1 Department of Health and Human Performance, Iowa State University, Ames, IA, USA
* To whom correspondence should be addressed. E-mail: wfranke{at}iastate.edu.
Aging and chronic exercise training influence leg venous compliance. Venous compliance affects responses to an orthostatic stress; its effect on tolerance to maximal lower body negative pressure (LBNP) in the elderly is unknown. PURPOSE: To determine the influence of age and fitness, a surrogate measure of exercise training, on calf venous compliance and tolerance to maximal LBNP in men and women. METHODS: Forty participants, 10 young fit (YF, 22.6±1.4 yrs, 57.1±6.2 ml/kg/min, VO2peak), 10 young unfit (YU, 23.1±3.5 yrs, 41.1±5.0 ml/kg/min), 10 older fit (OF, 73.9±6.6 yrs, 39.0±5.6 ml/kg/min,), and 10 older unfit (OU, 70.9±3.8 yrs, 27.1±6.8 ml/kg/min) underwent graded lower body negative pressure to presyncope or 4 minutes at -100 mmHg. Utilizing venous occlusion plethysmography, calf venous compliance was determined using the first derivative of the pressure-volume relation during cuff pressure reduction. RESULTS: The more fit groups had greater venous compliance than their unfit peers (p<0.05) as did the young groups compared to their older peers (p<0.05) such that OU<YU=OF<YF. LBNP tolerance did not differ between groups. CONCLUSION: These data suggest that aging reduces, and chronic exercise increases, venous compliance. However, these data do not support a significant influence of venous compliance on LBNP tolerance.
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