29 março 2014

A sonolência da Lusa quando escreve sobre o sono

Afirma a agência Lusa que "Estudo diz que ataques cardíacos aumentam na segunda-feira após mudança de hora".

Dizem os autores do estudo: "Daylight saving impacts the timing of heart attacks - Setting clocks ahead 1 hour may accelerate cardiac events in some, a large study shows".

Diz a Lusa:
Um estudo de cardiologistas, apresentado hoje numa conferência nos Estados Unidos, revelou um aumento nos ataques cardíacos na segunda-feira seguinte à mudança para a hora de verão, como vai acontecer nesta madrugada.

Dizem os autores do estudo:
Heart attacks historically occur most often on Monday mornings. Sandhu explains that in looking at other "normal" Mondays, there is some variation in events, but it is not significant.
Diz a Lusa:
A pesquisa foi realizada com base em dados recolhidos em hospitais do estado norte-americano de Michigan, que permitiram concluir um acréscimo de 25 por cento no número de ataques cardíacos na segunda-feira seguinte à mudança de hora.

Dizem os autores do estudo:
Researchers used Michigan's BMC2 database, which collects data from all non-federal hospitals across the state, to identify admissions for heart attacks requiring percutaneous coronary intervention from Jan. 1, 2010 through Sept. 15, 2013.
Diz a Lusa:
Durante quatro anos consecutivos, os investigadores, que apresentaram o estudo na American College of Cardiology, apurou um total de 93 ataques cardíacos na segunda-feira anterior à mudança de hora.
Este número aumentou para 125 na segunda-feira seguinte aos ponteiros no relógio terem avançado uma hora, enquanto na terça-feira desceram 21 por cento.

Dizem também os autores do estudo:
The hospitals included in this study admit an average of 32 patients having a heart attack on any given Monday. But on the Monday immediately after springing ahead there were on average an additional eight heart attacks. There was no difference in the total weekly number of percutaneous coronary interventions performed for either the fall or spring time changes compared to the weeks before and after the time change.

Diz a Lusa:
"Pode ser que as pessoas sejam muito sensíveis à perda de uma hora de sono", disse o cardiologista Amneet Sandhu, da Universidade do Colorado, em Denver.

Diz Sandhu:
"It may be that we as people are very sensitive to even 1 hour's loss of sleep in the context of our baseline stress levels," he said. "Sudden changes in sleep or time shifts may accelerate heart attacks in particularly vulnerable patients."
Diz a Lusa:
O especialista concluiu que o resultado do estudo "pode significar que as pessoas vulneráveis a problemas do coração apresentam grandes riscos após as mudanças de horário", afirmou.
Diz Sandhu:
"It may mean that people who are already vulnerable to heart disease may be at greater risk right after sudden time changes."

Dizem os autores do estudo:
"If we can identify days when there may be surges in heart attacks, we can be ready to better care for our patients," said Sandhu. Gaining an hour in the fall may have the opposite effect, though authors don't know why there were fewer heart attacks on Tuesday rather than Monday.

Diz a Lusa:
Sandhu revelou que foram comparados indicadores no Havai e Arizona, sem hora de verão, possibilitando a conclusão desta pesquisa de quatro anos.
Dizem os autores do estudo:
Sandhu said it would be interesting to compare these findings against heart attack trends in Hawaii and Arizona, which do not have daylight saving time.
Além da total falta de contextualização sobre o assunto, podiam - bom, isso já é pedir muito, eu sei... - ter explicado que este tipo de estudo é raro mas não inédito: It has been postulated that people in Western societies are chronically sleep deprived, since the average sleep duration decreased from 9.0 to 7.5 hours during the 20th century. Therefore, it is important to examine whether we can achieve beneficial effects with prolonged sleep. The finding that the possibility of additional sleep seems to be protective on the first workday after the autumn shift is intriguing. Monday is the day of the week associated with the highest risk of acute myocardial infarction, with the mental stress of starting a new workweek and the increase in activity suggested as an explanation. Our results raise the possibility that there is another, sleep-related component in the excess incidence of acute myocardial infarction on Monday. Sleep-diary studies suggest that bedtimes and wake-up times are usually later on weekend days than on weekdays; the earlier wake-up times on the first workday of the week and the consequent minor sleep deprivation can be hypothesized to have an adverse cardiovascular effect in some people. This effect would be less pronounced with the transition out of daylight saving time, since it allows for additional sleep. Studies are warranted to examine the possibility that a more stable weekly pattern of waking up in the morning and going to sleep at night or a somewhat later wake-up time on Monday might prevent some acute myocardial infarctions.

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