This sounds similar to "walking speed predicts mortality rate" https://www.scientificamerican.com/article/walking-speed-survival/ https://www.scientificamerican

This sounds similar to "walking speed predicts mortality rate" https://www.scientificamerican.com/article/walking-speed-survival/ https://www.scientificamerican.com/article/walking-speed-sur... Systemic weakness leading to death is a common pattern.