Quantitative analysis of computer-averaged electromyographic profiles of intrinsic limb muscles in ponies at the walk.

This research paper observes and analyzes the function of various internal muscles in both the front and back limbs of five ponies while at a normal walking pace. This involves applying surface electromyography to monitor and quantify muscle involvement during different stages of their stride.

Methods

• The study made use of surface electromyography, which records the electric signals generated by muscular activity.
• The electromagnetic signals were processed through band-pass filtering, rectifying, creating a linear envelope, and standardizing with respect to the stride duration. This made the collected data manageable and conducive to meaningful interpretation.
• At least 30 strides from two recording sessions were observed for both the left and right limbs in each pony. The resulting electromyographic signals were then drawn as curves on a graph varying with time.

Findings

• The muscle activity’s timing was deciphered from the graphs.
• Significant peaks in the electromyographic signal were used to identify individual muscle functions.
• For instance, in the front limb, the extensor carpi radialis muscle helps in extending the carpus (the pony’s wrist) towards the end of the swing phase of the stride, and supports the bending of the cubital joint as the swing phase begins.
• Similarly, findings relate to other muscles like the common digital extensor muscle, ulnaris lateralis muscle, and the flexor carpi radialis muscle in the front limb and long digital extensor muscle and deep digital flexor muscle in the hind limb. Their function ranged from extending and flexing the pony’s carpus, supporting the extension of the cubital joint, and preventing overextension of the distal interphalangeal joint during various stages of the stride.

Impact

• This research provides insight into the role of various muscles during a pony’s walking stride.
• By understanding the specific moments when different muscles come into play while walking, we can enhance treatments and preventative strategies for muscular injuries, thus improving the welfare and performance of ponies in various fields.