Reduced physical activity leads to weaker bones: Study

Scientists recently analyzed some prehistoric bones,
which revealed that there is no anatomical reason that
why a person born today could not develop the skeletal
strength of a prehistoric forager or a modern orangutan.
The findings of the latest study have been published in the
journal PNAS.
The new research, which revolves around the evolution of
humans across thousands of years, showed that human
skeletons have actually become quite lighter and more
fragile from the time of cultivation of crops. The
researchers stated that introduction of agriculture can be
termed as the start of sedentary lifestyle, as there was a
shift from foraging to farming.
Researchers associated with the study said they found
that human hunters related to almost 7,000 years ago had
bones comparable to the strength of modern orangutans.
But the farmers from the same area almost 6,000 years
later had significantly lighter and weaker bones those had
higher possibility to break under stress.

They found that the bone mass in foragers was almost
20% higher, which they said is similar to an average
person would lose after three months of weightlessness in
After finding out the diet differences and changes in body
size, researchers concluded that reduction in physical
activity is the main cause of degradation in human bone
strength across millennia.
They also said it is a trend which is moving towards some
dangerous levels as people now prefer to do less work
making use of their bodies then they used to do earlier.
Researchers hope that findings of the study support the
idea that exercise rather than diet is the key to heightened
fracture risk and conditions such as osteoporosis in later
More exercising in early life results in a higher peak of
bone strength around the age of 30, meaning the
inevitable weakening of bones with age will be less
among such individuals.

Submitted by: Andrea Cordell


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