how to calculate the mass of an astronaut?

For the teacheriss_B1T1.html

It is important for astronauts to monitor their body weight during a space journey. On just a few weeks , they may lose nearly 15 % of their weight due to muscle atrophy caused by their under-utilization . To prevent this physical decline , crew aboard the International Space Station ( ISS) typically spend two hours a day to do physical exercise. Weight control in space is not easy, since the traditional measurement scales do not work in orbit.

(P. Nespoli, astronaute italien de l'ESA, à bord de l'ISS)

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