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Rehabilitation Physiology Lab

Perini 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.

It has been proposed that cardiac control is altered in the elderly. Power spectral analysis of heart rate variability (HRV) was performed on 12 male and 11 female elderly subjects (mean age 74 years) while at rest in supine and sitting positions, and at steady states during 5 min of exercise (35-95% peak oxygen consumption, VO2peak). There were no differences in power, measured as a percentage of the total of the high frequency peak (HF, centred at about 0.25 Hz; 13% in males vs 12% in females), low frequency peak (LF, centred at 0.09 Hz; 25% in males and 22% in females), and very low frequency component (VLF, at 0.03 Hz; 66% in males and 69% in females) between body positions at rest. There was no difference in spectral power between male and female subjects. Total power decreased as a function of oxygen consumption during exercise, LF% did not change up to about 14 ml x kg(-1) x min(-1) (40% and 80% VO2peak in males and females, respectively), then decreased towards minimal values in both genders. HF% power and central frequency increased linearly with metabolic demand, reaching higher values in male subjects than in female subjects at VO2peak, while VLF% remained unchanged. Thus, the power spectra components of HRV did not reflect the changes in autonomic activity that occur at increasing exercise intensities, confirming previous findings in young subjects, and indicated similar responses in both genders.



Perini 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, 2002.

Pendergast 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.

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.

Fisher 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.

Fisher NM, DR Pendergast and E Calkins. Muscle Rehabilitation in Impaired Elderly Nursing Home Residents. Arch Phys Med Rehabil 72(3):181-185, 1991.

Pendergast 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.