Changes in blood viscosity with heavy and light exercise.
To clarify the relationship of the intensity of acute exercise to sudden cardiac death, we examined the effects of short-term heavy and light exercise on whole blood viscosity. Nine healthy sedentary male volunteers performed ten minutes of heavy (more than 95% of maximum oxygen consumption) or light (60% to 65% of maximum oxygen consumption) exercise. Blood samples were obtained before, immediately after, and one hour after exercise. The whole blood viscosity was immediately examined with an oscillation-type viscometer and was found to increase significantly after exercise and subsequently return to baseline levels within one hour after exercise. The whole blood viscosity increased by a similar degree after heavy or light exercise. Therefore, our results suggest that there is a similar risk of sudden cardiac death, due to increased whole blood viscosity, after short-term heavy or light exercise.
Department of Legal Medicine, Dokkyo University School of Medicine, Mibu, Tochigi, Japan. hitosugi@dokkyomed.ac.jp
Masahito
M
Hitosugi
Hitoshi
H
Kawato
Toshiaki
T
Nagai
Yoshinori
Y
Ogawa
Munehiro
M
Niwa
Naoko
N
Iida
Tetsuo
T
Yufu
Shogo
S
Tokudome
D000328:Adult; D001809:Blood Viscosity; D016757:Death, Sudden, Cardiac / Q000209:etiology; D004562:Electrocardiography; D015444:Exercise; D005080:Exercise Test; D006339:Heart Rate; D006400:Hematocrit; D006801:Humans; D008297:Male; D010101:Oxygen Consumption