Cortinovis A, Crippa A, Belloni G, Marchetti G, Marozzi R
Chir Ital. 1979 Oct;31(5):893-908.
In view of the increasingly widespread tendency of common people to undertake sports activities without adequate athletic preparation, and in consideration of certain cardiovascular alterations detected in subjects cultivating athletic activities of some magnitude for a number of years, the authors set out to explore the effects of severe muscular activity on circulation. More precicely, they measured blood and plasma viscosity at rest and after 50 minutes of intense athletic activity, competitive or otherwise, at the same time looking for possible changes of volemia, blood lipid composition, and hemodynamic parameters. Trained subjects, even if no longer very young, showed viscosity values in the lower range of normal, with no increase following muscular exertion; and likewise no changes of circulating blood volumes. Untrained subjects, conversely, showed more significant increase of both said values, albeit not beyond the limits of norm. The definitely if not dramatically different behavior of the two groups of subjects (trained versus untrained) brings out the value of this simple test. The authors discuss the factors and mechanisms that may be responsible for the observed changes: namely the loss of water and associated changes of electrolyte and protein concentrations, the alterations of blood pH, the changes of paO2, and the increased velocity of blood flow.
鉴于普通人在没有充分运动准备的情况下进行体育活动的趋势日益普遍，并且考虑到在多年从事一定强度体育活动的人群中检测到的某些心血管变化，作者着手探讨剧烈肌肉活动对循环系统的影响。更确切地说，他们测量了静息状态下以及在进行50分钟剧烈体育活动（竞技性或其他形式）后的血液和血浆粘度，同时寻找血容量、血脂成分和血液动力学参数的可能变化。受过训练的受试者，即使不再非常年轻，其粘度值也处于正常范围的较低水平，肌肉运动后没有升高；循环血量同样没有变化。相反，未经训练的受试者这两个值的升高更为显著，尽管未超出正常范围。两组受试者（受过训练的与未受过训练的）明显不同（即使不是极大不同）的表现凸显了这个简单测试的价值。作者讨论了可能导致观察到的变化的因素和机制：即水分流失以及相关的电解质和蛋白质浓度变化、血液pH值改变、动脉血氧分压变化以及血流速度加快。
