The ecology of human birth seasonally

Condon, Richard G.; Scaglion, Richard

doi:10.1007/bf01531169

Cited by 39 publications

(29 citation statements)

References 33 publications

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“…Sendo assim, não é possivel fazer uma análise mais aprofundada sobre as particularidades na organização do esporte (processo de seleção, quantidade de atletas, categorias, forma de promoção de nível/faixas, dentre outros) em cada um dos países. Há ainda, o fato dos nascimentos não estarem uniformemente distribuídos ao longo do ano e serem afetados por zonas ambientais e fatores culturais 39 . Deste modo, outras distribuições esperadas não podem ser utilizadas 40 .…”

Section: Discussionunclassified

Relative Age Effect and Constituent Year Effect: An Analysis of the International Tennis Federation Ranking

Moreira¹,

Lopes²,

Faria³

et al. 2017

J. Phys. Educ.

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RESUMOO Efeito da Idade Relativa (EIR) e o Efeito do Ano Constituinte (EAC) parecem influenciar o processo de formação de jovens tenistas. O objetivo do presente estudo foi investigar a presença desses efeitos no ranking de tenistas juniores da International Tennis Federation (ITF) e sua influência na pontuação obtida pelos tenistas. Os resultados encontrados demonstram a presença do EIR e do EAC (p ≤ 0,05). O modelo de regressão identificou que as variáveis "ano" e "mês" de nascimento predizem a pontuação dos atletas no ranking da ITF com uma variância explicada de 19%. Em conclusão, o ranking formado por várias faixas etárias não tem se mostrado uma estratégia de classificação sensível o bastante para prevenir o EIR e o EAC entre os tenistas juniores. Palavras-chave: Efeito da Idade Relativa. Efeito do Ano Constituinte. Tênis. ABSTRACTRelative Age Effect (RAE) and Constituent Year Effect (CYE) seem to influence the process of training young tennis players. The aim of this study was to investigate the presence of these effects in the ranking of junior tennis players of the International Tennis Federation (ITF) and its influence on the score obtained by such tennis players. The results show the presence of the RAE and the CYE (p ≤ 0.05). The regression model identified that the variables "year" and "month" of birth predict the scores of athletes in the ITF ranking with an explained variance of 19%. In conclusion, the ranking composed of various age groups does not seem to be a classification strategy sensitive enough to prevent the RAE and the CYE among junior tennis players. Keywords: Relative Age Effect. Constituent Year Effect. Tennis. IntroduçãoNo Tênis, como em outras modalidades esportivas, o processo de seleção e formação de atletas é bastante complexo. Atingir a excelência e tornar-se um tenista profissional é uma tarefa difícil e que poucos conseguem alcançar. Para obter sucesso em um esporte tão seletivo, crianças são selecionadas para participar de programas de treinamentos e competições 1 , visando atingir o alto rendimento já no início da idade adulta. O desenvolvimento de jovens atletas requer procedimentos multivariados 2 , já que além da preocupação com as características físicas e sócio-afetivas, é necessário que sejam trabalhados também os aspectos cognitivos e sensório-motores 3 . Entretanto, outras variáveis poderão interferir ao longo das etapas do desenvolvimento, entre elas as características genéticas 4 , o ambiente no qual se desenvolve 5 e os aspectos sociais envolvidos 6 nesse processo.Dentre os diversos fatores que parecem influenciar o processo de seleção e formação de atletas, o Efeito da Idade Relativa (EIR) têm recebido muita atenção nos últimos anos e vem sendo descrito em diversas modalidades esportivas coletivas, como o futebol 7,8 e o handebol 9 , em modalidades de luta, como o taekwondo 10 e o judô 11 e também em esportes

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Section: Discussionunclassified

Relative Age Effect and Constituent Year Effect: An Analysis of the International Tennis Federation Ranking

Moreira¹,

Lopes²,

Faria³

et al. 2017

J. Phys. Educ.

View full text Add to dashboard Cite

show abstract

“…Some precedent has been set in the field of demography, with seasonal variation in human births first documented in the early 1800s [30,31] and currently recognized as a global characteristic of humans [32][33][34][35][36]. Early studies of vital statistics in various United States regions established a national-level seasonal pattern of births with troughs in the spring and peaks in autumn [35,37].…”

Section: Introductionmentioning

confidence: 99%

“…Subsequent research has focused on either a few locations over long time periods, or many locations over short time periods. Collectively, these studies identified that northern and southern states have differences in their seasonal birth amplitude [32][33][34][35]37,38] and birth/conception minima [32,[38][39][40]. Studies of births in Africa and Asia have been sparse, but seasonal peak-trough differences in conception ranging from 11% to 64% have been documented in Africa and 8-58% in Asia [36].…”

Section: Introductionmentioning

confidence: 99%

Human birth seasonality: latitudinal gradient and interplay with childhood disease dynamics

et al. 2014

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More than a century of ecological studies have demonstrated the importance of demography in shaping spatial and temporal variation in population dynamics. Surprisingly, the impact of seasonal recruitment on infectious disease systems has received much less attention. Here, we present data encompassing 78 years of monthly natality in the USA, and reveal pronounced seasonality in birth rates, with geographical and temporal variation in both the peak birth timing and amplitude. The timing of annual birth pulses followed a latitudinal gradient, with northern states exhibiting spring/summer peaks and southern states exhibiting autumn peaks, a pattern we also observed throughout the Northern Hemisphere. Additionally, the amplitude of United States birth seasonality was more than twofold greater in southern states versus those in the north. Next, we examined the dynamical impact of birth seasonality on childhood disease incidence, using a mechanistic model of measles. Birth seasonality was found to have the potential to alter the magnitude and periodicity of epidemics, with the effect dependent on both birth peak timing and amplitude. In a simulation study, we fitted an susceptible-exposed-infectedrecovered model to simulated data, and demonstrated that ignoring birth seasonality can bias the estimation of critical epidemiological parameters. Finally, we carried out statistical inference using historical measles incidence data from New York City. Our analyses did not identify the predicted systematic biases in parameter estimates. This may be owing to the well-known frequency-locking between measles epidemics and seasonal transmission rates, or may arise from substantial uncertainty in multiple model parameters and estimation stochasticity.

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“…Condon and Scaglion (1982), were of the view that, cultural alignment of gestations that exist in agrarian or subsistence societies is knit to environmental constraints. This means that, seasons bedeviled by harsh atmospheric conditions and tedious subsistence activities usually records low birth, while seasons with favorable weather conditions and less strenuous cultural or religious activities records high birth rates.…”

Section: Health and Cultural Factors Influencing Human Birth Seasonalitymentioning

confidence: 99%

The Influence of Social Activities on Seasonal Variation in Birth Rates in Makurdi Town, Benue State, Nigeria

Idom¹,

Iorsamber²

2017

OJHE

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To examine the influence of social activities on birth rates in Makurdi town of Benue State Nigeria, a total of 23,000 recorded births from the year 2006 to 2015 were collated from six renown hospitals purposively selected based on issuance of ethical clearance and availability of data. With the use of secondary data, descriptive analysis was implored using tables and graphs. The result shows that births in Makurdi are characterized with two major peaks and two troughs. There is the March to June peak and the September to October peak. Alternatively, there is also the July to August trough and the December to January trough. Males generally dominate March births while females dominate December births. More pregnancies are conceived in the cool dry season which marks wedding celebrations, Christmas and New Year festivities while the hot dry season marking the Easter festivity and farming activities records the least conceptions. The implication is that conception is higher during festive periods that fall within months of low temperature. Therefore, the Ministry of health and other stake holders in Makurdi town should carry out awareness campaign on effective family planning during periods of high social activities or festivities to address the issue of high birth rates and over population in our society; Schools managements in Makurdi town should educate the students during festive periods to avoid teenage pregnancy.

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The ecology of human birth seasonally

Cited by 39 publications

References 33 publications

Relative Age Effect and Constituent Year Effect: An Analysis of the International Tennis Federation Ranking

Relative Age Effect and Constituent Year Effect: An Analysis of the International Tennis Federation Ranking

Human birth seasonality: latitudinal gradient and interplay with childhood disease dynamics

The Influence of Social Activities on Seasonal Variation in Birth Rates in Makurdi Town, Benue State, Nigeria

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