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- W2361372354 abstract "Objective To observe and compare the effects of exercise on the cardiac function during 30 d head-down tilt(HDT) bed rest,and to see if these protocols would positively affect cardiac function.Methods Fifteen healthy male volunteers were randomly divided into control group,lower limb muscular exercise group and bicycle ergometric exercise group,with 5 in each group.The subjects in the control group only performed-6° HDT bed rest for 30 d.The subjects in the lower limb muscular exercise group performed exercise with a lower limb muscular exercise and the subjects in the bicycle ergometric exercise group performed exercise with a bicycle ergometric exercise during HDT bed rest.The cardiac systole and pump functions were measured before,during and after HDT bed rest in three groups.Results Compared with pre-HDT,left ventricular ejection time(LVET) decreased significantly(P0.05) in the 22nd day and the 26th day of HDT,ejection fraction(EF) decreased(P0.05) in the 26th day of HDT,stroke volume(SV) and cardiac output(CO) decreased(P0.05) in the 1st day of HDT in control group.Compared with pre-HDT,LVET in limb muscular group decreased significantly(P0.05) throughout HDT,SV decreased(P0.05) in all time except the 5th day and the 7th day of HDT,CO decreased(P0.05) in the 1st day and the 30th day of HDT.Compared with pre-HDT,the indexes of cardiac systole function in bicycle ergometric group had no significant changes,SV and CO decreased(P0.05) in the 1st day of HDT.Conclusion The cardiac systole and pump functions decrease significantly during 30 d HDT bed rest.The limb muscular exercise and the bicycle ergometric exercise may improve the cardiovascular system to some extent.Further,the bicycle ergometric exercise is the better one." @default.
- W2361372354 created "2016-06-24" @default.
- W2361372354 creator A5055550617 @default.
- W2361372354 date "2009-01-01" @default.
- W2361372354 modified "2023-09-28" @default.
- W2361372354 title "Effects of Lower Limb Exercise on Cardiac Function during 30 d Head-down Tilt Bed Rest." @default.
- W2361372354 hasPublicationYear "2009" @default.
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