NASA astronaut Scott Kelly measured his heart condition while he was in space for 340 days.
According to New researchResearchers have found that the human heart contracts in space. In the study, published in the journal Circulation, NASA astronaut Scott Kelly’s heart was measured by “Doppler echocardiography” and “two-dimensional” before sending and during his 340-day presence in space.
Research shows that the human heart contracts due to the long-lasting weightlessness experienced by astronauts, and this process has been compared to the endurance swimming that an athlete performs daily for several hours.
During his time in space, Scott Kelly spent six days a week doing some exercise, including cycling, treadmills, and strenuous exercise. Later, his left ventricular mass shrank despite these exercises. He also faced other problems and challenges during his time, including changes in telomere length, changes in genes, DNA damage, and other changes.
The text of this research states:
During space flight, the lack of gravitational attraction leads to a short-term increase in ventricular blood volume, which in turn leads to a compensatory decrease in blood volume and a long-term decrease in cardiac output. [با این وجود] Without a solution, space flight can lead to atrophy (slimming) of the heart and orthostatic disability.
However, the report states that Scott Kelly’s heart condition returned to normal over time when he returned to Earth.