Spending a week in bed, à la John Lennon and Yoko Ono, might sound idyllic. But there’s plenty of research showing that the impact on your fitness and health can be brutal. In one 2016 study, young men who spent a week in bed lost 3.1 pounds of muscle, and their VO2 max and maximum strength declined by 6.4 and 6.9 percent, respectively. People spend months, or even years, trying to make gains of that magnitude, but you can lose it in a week.
The picture may be even worse for well-trained athletes. Studies find that those with the highest initial fitness levels suffer the greatest losses during bed rest. Sometimes there’s no avoiding it, though: surgery, injuries, and illnesses—including, notably, COVID—can confine even the fittest athletes to bed. So a new systematic review in the journal Sports Medicine, from researchers Barry Spiering, Jonathon Weakley, and Iñigo Mujika, takes a closer look at how bed rest affects trained athletes, and how to minimize its negative impacts.
The main finding is easy to sum up. A detailed search of four databases turned up an initial batch of 501 studies looking at fitness…
