Leave aside Olympic race walkers and you will find that people on an average find it extremely relaxed to run rather than taking a walk at the time they begin moving at about 2 meters per second or something around 4.5 miles an hour.

In this regard, a study was recently conducted by two biomedical engineers from the North Carolina State University, Dr. Dominic Farris and Dr. Gregory Sawicki. During their study, they found the reason behind why running makes us feel better than walking when we reach around 2 meters per second, may be because an immensely imperative calf muscle comes into play at that point in time of our walking, and as a result of it we generally tend to feel much more efficient in using the energy of your muscles as well as that of your body.

During the course of the study, which was made available in the recent online edition of the journal Proceedings of the National Academy of Sciences, the researchers reaped results from a one-off study making the best use of high-speed motion-capture techniques, ultrasound imaging along with a force-measuring treadmill with the intent of examining an highly imperative calf muscle and the manner in which it generally behaves when people are walking and running.

The study made effective use of ultrasound imaging by an immensely atypical manner: A small ultrasound investigation was good enough for making real time adjustments in the muscle of the legs of the subjects while he was made to walk and run at different speeds.

While expressing his opinion regarding the findings and their direct significance in the human life, Farris said: "The ultrasound imaging technique allows you to separate out the movement of the muscles in the lower leg and has not been used before in this context".