Influence of sound and light on heart rate variability in the elderly with special reference to age difference

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  • Hori Kiyokazu
    Department of Human Well-being, Faculty of Social Welfare, Kansai University of Welfare Sciences
  • Minami Satoshi
    Department of Human Well-being, Faculty of Social Welfare, Kansai University of Welfare Sciences
  • Hori Seiki
    Course of Physical Therapy, Faculty of Health Care Sciences, Himeji Dokkyo University

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  • 高齢者における音と光刺激が心拍変動に及ぼす影響と年齢差

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Studies concerning the influence of visual stimulus on heart rate variability during listening to simple sounds with different character such as sine waves, saw-tooth waves and white noise in the elderly have not been performed to our knowledge. The aim of this study was to investigate the effect of acoustic and visual stimuli and their synergistic effect on heart rate variability and age difference.<br> Ten healthy male and 12 healthy female elderly persons were selected for the study. At rest, the subjects listened to 9 different sounds at loudness levels averaging 60 dB. Beat-to-beat R-R intervals were continuously recorded under the closed-eye condition (CEC) and the open-eye condition (OEC) prior to, during, and immediately after the exposure to acoustic stimuli.<br> Low frequency (LF) power was defined over 0.04–0.15 Hz and high frequency (HF) power over 0.15–0.40 Hz. Cardiac autonomic function was estimated by plotting LF/HF (%) against HF (%), accompanied by a demarcated central area.<br> The LF/HF values tended to be smaller under the CEC than under the OEC and those tended to be smaller in females than in males under OEC. The HF values tended to be greater under CEC than under OEC.<br> Cardiac sympathetic nervous activity during auditory excitation in the elderly tended to decrease with the elimination of visual stimuli while cardiac parasympathetic nervous activity during auditory excitation tended to be greater under the CEC. Cardiac sympathetic nervous activity under the OEC tended to be smaller in females than in males.<br> In the elderly, cardiac parasympathetic nervous activity was significantly smaller and cardiac sympathetic nervous activity tended to be smaller when compared with data reported for young subjects.<br>

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