Headline:
New Study Reveals Lucy‘s Running Limitations, Shedding Light on Human Evolution
**subheadline:
Australopithecus afarensis, the famed "Lucy" fossil, couldn’t run as fast or efficiently as modern humans, but the findings hint at how our ancestors evolved for marathon capability.
Article:
In a groundbreaking study published in Current Biology, researchers have shed new light on our evolutionary past by estimating the running capability of ‘Lucy,’ the infamous 3.2 million-year-old fossil of Australopithecus afarensis. While Lucy couldn’t keep pace with today’s humans, the findings provide insights into how our ancestors developed into efficient long-distance runners.
Humans’ ability to walk and run efficiently is a result of around 2 million years of evolution, attributed to Homo erectus. However, earlier human ancestors like australopithecines, which lived around 4 million years ago, also walked on two legs. Their shorter legs and longer arms, compared to modern humans, suggested they were not as efficient in long-distance travel.
Using computational modeling of Lucy’s skeletal and muscle structures, scientists calculated her top running speed. Lucy could only manage 18 km/h (11 mph), far slower than the average human’s 22 km/h (14 mph), let alone elite athletes like Usain Bolt who can reach an astonishing 43 km/h (27 mph). Moreover, Lucy required 1.7 to 2.9 times more energy to run, making long journeys extremely taxing.
The primary barrier to Lucy’s running speed was her tendon Achilles and calf muscles, which differed significantly from those of modern humans.Human tendons are long and elastic, providing power and efficiency to the foot, while Lucy’s were shorter and less efficient in energy transfer.
When researchers modeled Lucy with human-like tendons, her speed improved, but her small body size remained a considerable hindrance. This demonstrates the critical role tendon Achilles evolution played in enhancing human running performance. Notably, this is the first time Lucy’s running capability was directly estimated using musculoskeletal modeling.
The study underscores the importance of tendon Achilles and calf muscle evolution in human running, offering a glimpse into how our ancestors developed their unique bipedal running ability. Further research is needed to fully understand the differences in walking and running styles between australopithecines and modern humans, including the role of arm movement and torso rotation.
Source: Radar Papua
Internal Linking:
- [[[["Lucy" Fossil
- Long-distance running
- Evolution
External Linking:
- Current Biology journal
