Seasonal variations of congenital dislocation of the hip

Cohen, P. L.

doi:10.1080/09291017109359285

Cited by 18 publications

(13 citation statements)

References 12 publications

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“…Huntington (1938) postulated a "basic animal rhythm" in human beings including a season of birth. Incorporating new findings, Cohen's (1971) hypothesis is compatible with Huntington's. With regard to CDH, Cohen rejects the hypotheses that seasonal patterns of infectious diseases affect the fetus and that annual cycles in weather constitute the basis for the observed variation in CDH.…”

Section: Circannual Rhythms and Human Birthsupporting

confidence: 51%

“…The data from several countries (Cohen 1970;Cohen 1971) of the Northern Hemisphere consistently reveal trends with a peak during the autumn-the months of September through November (Fig. 7).…”

Section: Circannual Rhythms and Human Birthmentioning

confidence: 72%

“…Although an association between seasonal variations in congenital malformations and seasonal patterns of viral or other types of infections has been inferred, there is no clear indication the latter are entirely responsible for changes in the incidence of different types of congenital malformations during the year (Stoller and Collman 1965;Cohen 1971). Huntington (1938) postulated a "basic animal rhythm" in human beings including a season of birth.…”

Section: Circannual Rhythms and Human Birthmentioning

confidence: 97%

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Aspects of Human Chronopathology

Smolensky¹

1983

Topics in Environmental Physiology and Medicine

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Often in an individual or a group of patients the manifestation of disease or the exacerbation of symptoms is predictable, exhibiting time dependencies (chronopathologies) over 24-hr, 1-month, and 1-year periods. Chronopathology may involve also alterations in the temporal structure of biological functions quantifiable by differences in the period, acrophase, mesor, and/or amplitude, preceding, following, or coincident with a change in health status. While the major emphasis of most investigations has been the substantiation of periodicities in the occurrence of symptoms or morbid events, the study of changes in the body's temporal structure associated with the commencement of illness has yet to be vigorously pursued.

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Section: Circannual Rhythms and Human Birthsupporting

confidence: 51%

Section: Circannual Rhythms and Human Birthmentioning

confidence: 72%

Section: Circannual Rhythms and Human Birthmentioning

confidence: 97%

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Aspects of Human Chronopathology

Smolensky¹

1983

Topics in Environmental Physiology and Medicine

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“…Therefore, the annual pattern of non-traumatic PSE may have been missed by the relative laxity of the data gathering. A set of epidemiologic studies illustrates this rather important point (Smolensky, 1983(Smolensky, , 1994Slater, 1964;Cohen, 1970). The epidemiologic study of Slater (1964) (with n ¼ 12,602) reveals that the total number of congenital malformations is rather constant over the months as well as the seasons of the yr.…”

Section: Which Endogenous Factors Help Explain Differences In the Annmentioning

confidence: 97%

24‐Hour, Weekly, and Annual Patterns in Traumatic and Non‐Traumatic Surgical Pediatric Emergencies

Reinberg

Mechkouri

2005

Chronobiology International

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24 h patterns with high frequency components in the incidence of pediatric trauma were validated and quantified in one of our earlier studies. Herein, we further explored the temporal--high frequency, 24 h, weekly (7d), hemi-weekly (3.5d), and annual--patterns in traumatic (1990-1997; n = 15,110 events) and non-traumatic pediatric surgical emergencies (PSE) (1992-2001; n = 5,593 events) as well as automobile accidents (AA) (1990-1997; n = 67,712) in the County of Vaud, Switzerland. The latter served as a reference system of human adult activity and risk. Two-way ANOVA, chi2, correlation, and cosinor analyses were used as statistical tools. A 24h pattern, reproducible from year to year, was validated in traumatic and non-traumatic PSE and AA. The 24 h patterns were not correlated and differed from one another in terms of their acrophase (peak time) and amplitude. A gender-related difference was found only in the non-traumatic time series for weekly (7d) and hemi-weekly (3.5d) patterns. The latter were detected in boys but not girls. No statistically significant difference was found in the acrophase and amplitude between boys and girls in the temporal patterns of other periods. An annual pattern was validated in automobile accidents (acrophase: 4th of September +/- 37d (SD)) and pediatric trauma (acrophase: 14th of June +/- 10d), but not in non-traumatic PSE. These results suggest that environmental modulations differ between the incidence of traumatic and non-traumatic PSE. Presumably, the two phenomena involve different aspects of the temporal organization and/or different levels of susceptibility of a set of biological rhythms to environmental factors.

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“…A bibliography published recently on seasonality in health and disease (Allan and Douglas, 1994) lists many papers on seasonal occurrence of polygenic disorders such as congenital malformations, cardiac arterial disease, hypertension, duodenal ulcer, and various malignancies in addition to breast cancer. For each of these disorders, one reference (not necessarily cited in the bibliography) is given in the following brief list (Brennan et al, 1982;Cohen, 1971Cohen, , 1983Cohen, , 1989Cohen, , 1995Douglas et al, 1991).…”

Section: Masking and Rhythmicitymentioning

confidence: 99%

Alternating Reducing and Enhancing Effect of Pregnancy on Breast Cancer Risk May Reveal Periodic Phenomena which Mask Circannual Rhythms

Cohen¹

1997

Biological Rhythm Research

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Although a relationship between reproductive factors and breast cancer risk has been known for long, there are many contradictions between different studies, and a connection with a biological mechanism has not yet been found. Recently, new details have been revealed about different effects of pregnancy on breast cancer risk. During pregnancy breast cancer risk is strongly reduced, while inversely,some years after giving birth the risk is increased. Furthermore, risk is strongly reduced in women whose consecutive births of four or more children occur after short intervals and are terminated before the age of 30. Recently, we have postulated rhythmicity in the occurrence of breast cancer in a subgroup of young women. By analogy with circadian rhythms it may be assumed that circannual rhythms too are influenced by synchronizers and masking effects. In circadian rhythms masking may be by external or internal periodic factors, such as the sleep/wake cycle, meal timing and activity.Over the year pregnancy may be such a periodic factor, with alternation of an empty uterus and one wich gradually enlarges as a consequence of a developing fetus. A masking factor is active only as long as present. Therefore the circannual rhythmicity of breast cancer is attenuated or nullified only during pregnancy. After giving birth, the temporal deficit of the rhythmic increase of tumor growth may be restored, leading to a rebound effect expressed as an increased clinical detection of malignancy some years later. When several consecutive pregnancies occur after short intervals the masking effect continues uninterruptedly, accompanied by a strong reduced breast cancer risk. The same biological mechanism may underly the remission during pregnancy in autoimmune disorders such as rheumatoid arthritis and Graves' disease. The immune system, crucial in autoimmune disorders, is build up of several constituents which are clearly rhythmic, e.g the lymphocytes. Masking of one or more of these rhythmicities may lead to disease attenuation, followed by relapses as soon as the masking factor has been eliminated.

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Seasonal variations of congenital dislocation of the hip

Cited by 18 publications

References 12 publications

Aspects of Human Chronopathology

Aspects of Human Chronopathology

24‐Hour, Weekly, and Annual Patterns in Traumatic and Non‐Traumatic Surgical Pediatric Emergencies

Alternating Reducing and Enhancing Effect of Pregnancy on Breast Cancer Risk May Reveal Periodic Phenomena which Mask Circannual Rhythms

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