Researchers have shown that human foot is not unique and have much in common with the flexible feet of other great apes.
Current understanding of the evolution of human walking is based on research from the 1930s, which proposes that human feet function very differently to those of other apes, due to the development of arches in the mid-foot region and the supposed rigidity of that on the outside edge of the foot.
In a study of more than 25,000 human steps made on a pressure-sensitive treadmill at the University's Gait Laboratory, scientists at Liverpool have shown that despite having abandoned life in the trees long ago, our feet have retained a surprising amount of flexibility, the type seen in the feet of other great apes, such as orang-utans and chimpanzees, that have remained largely tree-dwelling.
Professor Robin Crompton, from the University's Institute of Ageing and Chronic Disease, said that it has long been assumed that as we possess lateral and medial arches in our feet - the lateral one supposedly being rigid and supported in bone - that the feet differ markedly to those of our nearest relatives, whose mid-foot is fully flexible and makes regular ground contact.
He said that this supposed 'uniqueness,' however, has never been quantitatively tested and that they found that the range of pressures exerted under the human mid-foot, and thus the internal mechanisms that drive them, were highly variable, so much so that they actually overlapped with those made by the great apes.
It was previously believed that that humans making contact with the ground with the mid-foot region are primarily those that suffer from diabetes or arthritis, both of which can impact on the structure of the feet.
However, research showed that two thirds of normal healthy subjects produced some footfalls where the mid-foot touches the ground, with no indication that this is other than an aspect of normal healthy walking.
Dr Karl Bates, from the University's Institute of Ageing and Chronic Disease, said that humans' ancestors probably first developed flexibility in their feet when they were primarily tree-dwelling, and moving on bendy branches, but as time passed and we became more and more ground-dwelling animals, some new features evolved to enable us to move quickly on the ground.
Bates said that their limbs, however, did not adapt to life on the ground anywhere near as much as those of other ground-dwelling animals such as horses, hares and dogs.
He added that their tests showed that human feet are not as stiff as originally thought and actually form part of a continuum of variation with those of other great apes. (ANI)