lab2 - Selection of Preferred Stride Lengths Introduction:...

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Selection of Preferred Stride Lengths Introduction: When running, every person has his/her preferred stride length (PSL). A PSL can be broken into two parts; the stride length (SL) and stride frequency (SF). The SL is the distance from one heel to contact to the next heel contact of the same foot. The SF is simply how many stride lengths taken per second. There are several things that can determine how a person chooses his/her stride length. Some hypotheses consider energy expenditure, magnitude of impact to the joints, joint health, etc. Knowing how a person chooses their SL and SF and the outcome of altering these can be important for sports training and enhancement or physical therapy purposes. Previous studies have indicated a correlation between stride length and metabolic energy expenditure. One specific study showed that humans choose a stride length in which energy expenditure is lowest (Umberger, Martin, 2007). This experiment focused on the possible criteria determining one’s stride length when walking. The results of this experiment showed that when one increases his/her stride length, there is smaller range of motion at the hip and a greater range of motion at the knee. The opposite was true for a lower stride length; they found a greater range of motion in the hip and a smaller range of motion at the knee. The purpose of our experiment was to determine what criteria may affect a person’s preferred stride length and to determine the outcome of altering one’s stride length while running. The criteria focused on were energy expenditure (based on heart rate) and heel impact during contact. After reading the study done by Umberger and Martin, it was hypothesized that energy expenditure (heart rate) would be the least at the
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preferred stride length, as would the amount of impact. It was also hypothesized that the
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lab2 - Selection of Preferred Stride Lengths Introduction:...

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