Fisher NM, DR Pendergast. Improved cardiac output after
exercise in the head-down tilt position in elderly subjects.
Gerontologist 39 Special Issue I:466, 1999.
Elderly subjects have depressed oxygen transport (VO2) resulting,
in part, from reduced cardiac function. Exercise training can increase
cardiac function, however, older subjects may not exercise intensely
enough. In the head-down tilt position (HDT), cardiac output (CO)
is increased at rest and exercise. This study examined the effects
of exercise training (3x/wk, for 1 hr, for 8 wks) in the HDT in
8 men and 8 women over 70 years. VO2, ECG, systolic and diastolic
blood pressure (SBP,DBP), and CO were measured, and pulse and mean
pressure (PP,MAP) and stroke volume (SV) calculated during a maximal
cycle ergometer test (50 rpm, 0.5 Kp increments every 2 min) in
the erect and HDT positions pre and post training. At rest erect,
CO (9%), SV (8%), DBP (6%) increased while SBP decreased (8%). At
rest HDT, CO was unchanged, but SV (6%), SBP (6%), PP (5%), MAP
(6%) were increased after training. During sub-max exercise, SV
was elevated (6-9%) and the slope CO/VO2 was greater. The max work-rate
increased 25 W, VO2 by 8 and 15%, CO by 5 and 12%, and SV by 6 and
9% in erect and HDT, respectively. Improved cardiac output and oxygen
transport resulted from exercise training in the head-down tilt
position in male and female subjects over the age of 70 years.
R, NM Fisher, A Veicsteinas, DR Pendergast. Aerobic
Training and Cardiovascular Responses at Rest and during Exercise
in Older Men and Women. Med Sci Sports Exerc 34:700-708,
DR, NM Fisher and E Calkins. Cardiovascular, neuromuscular,
and metabolic alterations with age leading to frailty .
J Gerontol: Biol Sci 48(Special Issue):61-67, 1993.
R, S Milesi, NM Fisher, DR Pendergast, A Veicsteinas.
Heart Rate Variability during Dynamic Exercise in Elderly
Males and Females. Eur J Appl Physiol 82(1-2):8-15, 2000.
NM, DR Pendergast and E Calkins. Maximal Isometric Torque
of Knee Extension as a Function of Muscle Length in Subjects of Advancing
age. Arch Phys Med Rehabil 71(10):729-734, 1990.
NM, DR Pendergast and E Calkins. Muscle Rehabilitation in
Impaired Elderly Nursing Home Residents. Arch Phys Med
Rehabil 72(3):181-185, 1991.
DR, E Calkins, NM Fisher and R Vickers. Muscle Rehabilitation
in Nursing Home Residents with Cognitive Impairment: a Pilot Study.
Am J Alzheimer Care Rel Dis July/August:: 20-25, 1987.
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