Poincaré plot indexes of heart rate variability: Relationships with other nonlinear variables

The Poincaré plot for heart rate variability analysis is a technique considered geometrical and non-linear, that can be used to assess the dynamics of heart rate variability by a representation of the values of each pair of R-R intervals into a simplified phase space that describes the system's evolution. The aim of the present study was to verify if there is some correlation between SD1, SD2 and SD1/SD2 ratio and heart rate variability nonlinear indexes either in disease or healthy conditions. 114 patients with arterial coronary disease and 65 healthy subjects underwent 30. minute heart rate registration, in supine position and the analyzed indexes were as follows: SD1, SD2, SD1/SD2, Sample Entropy, Lyapunov Exponent, Hurst Exponent, Correlation Dimension, Detrended Fluctuation Analysis, SDNN, RMSSD, LF, HF and LF/HF ratio. Correlation coefficients between SD1, SD2 and SD1/SD2 indexes and the other variables were tested by the Spearman rank correlation test and a regression analysis. We verified high correlation between SD1/SD2 index and HE and DFA (α1) in both groups, suggesting that this ratio can be used as a surrogate variable. © 2013 Elsevier B.V.

Biologia populacional e reprodutiva do camarão sete-barbas na Baía de Santos, São Paulo

We investigated the sexual maturity, reproductive period and juvenile recruitment (both associated with salinity and temperature of bottom water) and sex-ratio of Xiphopenaeus kroyeri in Santos Bay, São Paulo. Monthly samples were obtained from June 2008 through May 2009 along four transects. Individuals were measured, sexed and the developmental stage of the reproductive system was macroscopically determined. The mean carapace length of females was larger than that of males. Females attained physiological maturity with 25.5 mm and males with 16.8 mm. The reproductive period was continuous with higher proportions of reproductive females in autumn. Although not significant, in February occurs a peak of reproductive females similar to March. An intermediate peak of these females occurs between August and October and it contributed to the recruitment in summer. The smallest amount of juveniles after the main peak of spawning (February, March and April) can be explained by migration or consequences of open access for fishery that occurs on June. The overall sex-ratio was approximately 1:1. However, when considering the spatial distribution, we observed a greater amount of reproductive females in shallow waters in the bay. The differential distribution between the sexes could be associated with appropriated areas to spawn. The current legal off-season occurs between March and May, and, according to our results of the frequency of reproductive females, we suggest the inclusion of February in the off-season.

Análise comparativa da produtividade de híbridos de mamoneira (Ricinus communis L.) obtidos por meio da hibridação convencional e do método de híbridos crípticos

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Morfofisiologia das glândulas reprodutivas acessórias masculinas de morcegos: estudo nas espécies Artibeus planirostris e Platyrrhinus lineatus (Chiroptera: Phylostomidae )

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Puberdade retardada no rato macho: correlações entre indicadores externos e internos e repercussões sobre a qualidade espermática e fertilidade

Pós-graduação em Biologia Geral e Aplicada - IBB

Investigação da toxicidade reprodutiva do fungicida Procloraz, com ênfase sobre aspectos morfofuncionais do epidídimo de ratos adultos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito da cafeína e do cádmio na próstata do rato wistar púbere: proliferação e morte de células epiteliais e alterações estromais

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Aspectos da infecção toxoplasmática no sistema reprodutor de ovinos (Ovis aries) machos experimentalmente infectados

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Toxoplasmose experimental em caprinos machos, com ênfaser no sitema reprodutor

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Influência da mistura de cinco praguicidas em baixas doses sobre o sistema reprodutor de ratas Aprague-Dawley, Wistar e Lewis

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação do sêmen de búfalos em três meios de criopreservação

Pós-graduação em Medicina Veterinária - FMVZ

Caracaterização ultrassonográfica, morfofisiológica do sistema reprodutor de machos e fêmeas de Crotalus durissus terrificus

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Influência dos níveis protéicos fornecidos na dieta sobre o sistema reprodutivo de carneiros

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Aspectos histológicos do útero, tuba uterina e ovário de búfalas (Bubalus bubalis)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação endócrina e anatomo-morfológica do trato genital de fêmeas suínas

Pós-graduação em Medicina Veterinária - FMVZ