In this study, previously sedentary, overweight or obese postmenopausal women experienced a graded dose-response change in fitness across levels of exercise training.

在此项研究中，先前久坐、超重或肥胖的绝经后妇女适能的变化与锻炼水平呈剂量-量反应关系。

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"Astronauts' bones become weaker and their physical fitness decreases the longer they spend in space, much like an elderly person leading a sedentary lifestyle, " says Dr Green.

BBC: What are the health risks of space travel?