The biggest evolution is in the material they are made of sticks. Formerly made of solid wood and flexible.
Around 1905 the Japanese produced bamboo rods that were cut in special times and passed certain
hardening processes.
In 1948 he switched to bamboo pole by aluminum.
In 1958 Americans have come to use the glass fiber rods.
In the International Federation rules banned the exchange of hand position above the acrobats because they put the rod in
vertical and balance, climbing the same.
Source: Athletics
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