Astronauts who all have lost bone decades in space, from which many of them were not able to recover even after a year back on Earth, as per the researchers have said on Thursday. The researchers have informed us about this as a warning that it could be a 'big concern' for future missions of astronauts.

HIGHLIGHTS
Astronauts struggle to regain bone density after a space mission.
Around one to two percent of bone density is lost every month in space.
It is considered as ‘the silent disease’, becoming a ‘big concern’ on Earth.

According to the previous research due to the lack of gravity the legs takes off the pressure when it comes to standing and walking, as a result of which astronauts lose between one to two percent of bone density for every month spent in space.

In order to find out the ways astronauts can get recovered once their feet are back on the ground, a new study came into scenario. In this study, they have scanned the wrists and ankles of 17 astronauts before, during and after a stay on the International Space Station.

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Well, it has been found out the bone density which is lost by astronauts was equivalent to how much they would shed in several decades if they were back on Earth. The researchers also found that nine of the astronauts’ shinbone density had not fully recovered even after a year on Earth .The ones’ who ranged from four to seven months on space, were the slowest to recover from this bone problems.

'The longer the time is spend in space missions, the more bone will get lose,' 'Will this continue to get worse with time or not? We don't know,' Boyd told AFP.

As per a doctor, 'Even after the two hours of sport in a day, it is like getting bedridden for the other 22 hours.'

A 2020 study has predicted that a three-year spaceflight to Mars would lead 33 percent of astronauts at risk of getting infected with osteoporosis.

According to the head of medicine research at France’s CNES space agency, Guillemette Gauquelin-Koch said that the weightlessness that is experienced in space is 'most drastic physical inactivity'.

Well, the astronauts who are fit and are in their 40s had not noticed the drastic bone loss in the body. According to Boyd, the Earth-bound equivalent osteoporosis is known as 'the silent disease' and it is visible mostly in the astronauts who have returned from a long space mission.