Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects
The objective of this study was to use linear and non-linear methods to investigate cardiac autonomic modulation in healthy elderly men and women in response to a postural change from the supine to the standing position. Fourteen men (66.1 ± 3.5 years) and 10 women (65.3 ± 3.3 years) were evaluated....
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Divulgação Científica
2011-01-01
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| Series: | Brazilian Journal of Medical and Biological Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000100005&lng=en&tlng=en |
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| author | N.M. Perseguini A.C.M. Takahashi J.R. Rebelatto E. Silva A. Borghi-Silva A. Porta N. Montano A.M. Catai |
| author_facet | N.M. Perseguini A.C.M. Takahashi J.R. Rebelatto E. Silva A. Borghi-Silva A. Porta N. Montano A.M. Catai |
| author_sort | N.M. Perseguini |
| collection | DOAJ |
| description | The objective of this study was to use linear and non-linear methods to investigate cardiac autonomic modulation in healthy elderly men and women in response to a postural change from the supine to the standing position. Fourteen men (66.1 ± 3.5 years) and 10 women (65.3 ± 3.3 years) were evaluated. Beat-to-beat heart rate was recorded in the supine and standing positions. Heart rate variability was studied by spectral analysis, including both low (LFnu-cardiac sympathetic modulation (CSM) indicator) and high (HFnu-cardiac vagal modulation (CVM) indicator) frequencies in normalized units as well as the low frequency/high frequency (LF/HF) ratio. Symbolic analysis was performed using the following indexes: 0V% (CSM indicator), 1V% (CSM and CVM indicators), 2LV% (predominantly CVM indicator) and 2ULV% (CVM indicator). Shannon entropy was also calculated. Men presented higher LFnu and LF/HF ratio and lower HFnu and 1V% symbolic index (57.56, 4.14, 40.53, 45.96, respectively) than women (24.60, 0.45, 72.47, 52.69, respectively) in the supine position. Shannon entropy was higher among men (3.53) than among women (3.33) in the standing position, and also increased according to postural change in men (3.25; 3.53). During postural change, the LFnu (24.60; 49.85) and LF/HF ratio (0.45; 1.72) increased, with a concomitant decrease in HFnu (72.47; 47.56) and 2LV% (14.10; 6.95) in women. Women presented increased CSM in response to postural change and had higher CVM and lower CSM than men in the supine position. In conclusion, women in the age range studied presented a more appropriate response to a postural change than men, suggesting that cardiac autonomic modulation may be better preserved in women than in men. |
| first_indexed | 2024-12-19T07:31:18Z |
| format | Article |
| id | doaj.art-f0b237f1779b435c908f91d1cc942f67 |
| institution | Directory Open Access Journal |
| issn | 1414-431X |
| language | English |
| last_indexed | 2024-12-19T07:31:18Z |
| publishDate | 2011-01-01 |
| publisher | Associação Brasileira de Divulgação Científica |
| record_format | Article |
| series | Brazilian Journal of Medical and Biological Research |
| spelling | doaj.art-f0b237f1779b435c908f91d1cc942f672022-12-21T20:30:41ZengAssociação Brasileira de Divulgação CientíficaBrazilian Journal of Medical and Biological Research1414-431X2011-01-01441293710.1590/S0100-879X2011000100005S0100-879X2011000100005Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjectsN.M. Perseguini0A.C.M. Takahashi1J.R. Rebelatto2E. Silva3A. Borghi-Silva4A. Porta5N. Montano6A.M. Catai7Universidade Federal de São CarlosUniversidade Federal de São CarlosUniversidade Federal de São CarlosUniversidade Federal de São CarlosUniversidade Federal de São CarlosUniversity of MilanUniversity of MilanUniversidade Federal de São CarlosThe objective of this study was to use linear and non-linear methods to investigate cardiac autonomic modulation in healthy elderly men and women in response to a postural change from the supine to the standing position. Fourteen men (66.1 ± 3.5 years) and 10 women (65.3 ± 3.3 years) were evaluated. Beat-to-beat heart rate was recorded in the supine and standing positions. Heart rate variability was studied by spectral analysis, including both low (LFnu-cardiac sympathetic modulation (CSM) indicator) and high (HFnu-cardiac vagal modulation (CVM) indicator) frequencies in normalized units as well as the low frequency/high frequency (LF/HF) ratio. Symbolic analysis was performed using the following indexes: 0V% (CSM indicator), 1V% (CSM and CVM indicators), 2LV% (predominantly CVM indicator) and 2ULV% (CVM indicator). Shannon entropy was also calculated. Men presented higher LFnu and LF/HF ratio and lower HFnu and 1V% symbolic index (57.56, 4.14, 40.53, 45.96, respectively) than women (24.60, 0.45, 72.47, 52.69, respectively) in the supine position. Shannon entropy was higher among men (3.53) than among women (3.33) in the standing position, and also increased according to postural change in men (3.25; 3.53). During postural change, the LFnu (24.60; 49.85) and LF/HF ratio (0.45; 1.72) increased, with a concomitant decrease in HFnu (72.47; 47.56) and 2LV% (14.10; 6.95) in women. Women presented increased CSM in response to postural change and had higher CVM and lower CSM than men in the supine position. In conclusion, women in the age range studied presented a more appropriate response to a postural change than men, suggesting that cardiac autonomic modulation may be better preserved in women than in men.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000100005&lng=en&tlng=enHeart rate variabilityAutonomic nervous systemSymbolic analysisSpectral analysisElderlyGender |
| spellingShingle | N.M. Perseguini A.C.M. Takahashi J.R. Rebelatto E. Silva A. Borghi-Silva A. Porta N. Montano A.M. Catai Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects Brazilian Journal of Medical and Biological Research Heart rate variability Autonomic nervous system Symbolic analysis Spectral analysis Elderly Gender |
| title | Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects |
| title_full | Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects |
| title_fullStr | Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects |
| title_full_unstemmed | Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects |
| title_short | Spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects |
| title_sort | spectral and symbolic analysis of the effect of gender and postural change on cardiac autonomic modulation in healthy elderly subjects |
| topic | Heart rate variability Autonomic nervous system Symbolic analysis Spectral analysis Elderly Gender |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000100005&lng=en&tlng=en |
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