Ranging from the lower ambient temperature , the presence of snow cover , seasonal factors , and time of the day to location of fall , these factors have different levels of impact related to higher incidence or mortality of fall .
There existed systematic review on studies investigating the association between hip fractures and external risk factors including meteorological factors .
Albeit the fact that most serious common fall injury is a hip fracture , it can not account for all injuries forms of fall .
There was a lack of systematic review covering all fall-related injury or deaths to thoroughly summarise meteorological aspects of fall .
This study aim ed to systematic ally review epidemiological studies of fall and fall-related circumstances without restriction to hip fracture .
Increases in platelet and red cell counts, blood viscosity, and arterial pressure during mild surface cooling: factors in mortality from coronary and cerebral thrombosis in winter.
Six hours of mild surface cooling in moving air at 24 degrees C with little fall in core temperature ( 0.4 degree C ) increased the packed cell volume by 7 % and increased the platelet count and usually the mean platelet volume to produce a 15 % increase in the fraction of plasma volume occupied by platelets . Little of these increases occurred in the first hour . Whole blood viscosity increased by 21 % ; plasma viscosity usually increased , and arterial pressure rose on average from 126/69 to 138/87 mm Hg . Plasma cholesterol concentration increased , in both high and low density lipoprotein fractions , but values of total lipoprotein and lipoprotein fractions were unchanged . The increases in platelets , red cells , and viscosity associated with normal thermoregulatory adjustments to mild surface cooling provide a probable explanation for rapid increases in coronary and cerebral thrombosis in cold weather . The raised arterial pressure and possibly cholesterol concentration may contribute to slower components of the increased thrombosis
Ranging from the lower ambient temperature , the presence of snow cover , seasonal factors , and time of the day to location of fall , these factors have different levels of impact related to higher incidence or mortality of fall .
There existed systematic review on studies investigating the association between hip fractures and external risk factors including meteorological factors .
Albeit the fact that most serious common fall injury is a hip fracture , it can not account for all injuries forms of fall .
There was a lack of systematic review covering all fall-related injury or deaths to thoroughly summarise meteorological aspects of fall .
This study aim ed to systematic ally review epidemiological studies of fall and fall-related circumstances without restriction to hip fracture .