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Upper extremity function in sprint r...

Froidmont, Arnaud.

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Upper extremity function in sprint running.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Upper extremity function in sprint running./
作者:	Froidmont, Arnaud.
面頁冊數:	103 p.
附註:	Source: Masters Abstracts International, Volume: 51-06.
Contained By:	Masters Abstracts International51-06(E).
標題:	Biophysics, Biomechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1537765
ISBN:	9781303096051

Upper extremity function in sprint running.
Froidmont, Arnaud.

Upper extremity function in sprint running. - 103 p.

Source: Masters Abstracts International, Volume: 51-06.

Thesis (M.S.)--Northern Arizona University, 2013.

In 1982, Hinrichs, R.N. wrote his dissertation "Upper Extremity Function in Run- ning". He studied the influence of arm swing on distance runners. He found out that the arms were contributing to 5-10 percent of the lift, were reducing the horizontal excursion of the center of mass both front-to-back and side-to-side. In this thesis, we studied whether the results were similar for sprinters. The approach used is similar to the one from 1987. Each subject is filmed over 2 starting trials and 2 full-speed trials in order to study the arm swing during the drive phase and at maximum speed. We digitized 21 points on the body on every video frame. With two different images of one point and after calibration for a scaling factor, there is only one set of corre- sponding 3-d coordinates.

ISBN: 9781303096051Subjects--Topical Terms:

1035342
Biophysics, Biomechanics.

Upper extremity function in sprint running.
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245 1 0 $a Upper extremity function in sprint running.
300 $a 103 p.
500 $a Source: Masters Abstracts International, Volume: 51-06.
500 $a Adviser: Mark James.
502 $a Thesis (M.S.)--Northern Arizona University, 2013.
520 $a In 1982, Hinrichs, R.N. wrote his dissertation "Upper Extremity Function in Run- ning". He studied the influence of arm swing on distance runners. He found out that the arms were contributing to 5-10 percent of the lift, were reducing the horizontal excursion of the center of mass both front-to-back and side-to-side. In this thesis, we studied whether the results were similar for sprinters. The approach used is similar to the one from 1987. Each subject is filmed over 2 starting trials and 2 full-speed trials in order to study the arm swing during the drive phase and at maximum speed. We digitized 21 points on the body on every video frame. With two different images of one point and after calibration for a scaling factor, there is only one set of corre- sponding 3-d coordinates.
520 $a We used the NLT calibration method to find the positions of the different cameras. The use of a single guess for the Levenberg-Marquardt algorithm used in the calibra- tion gave us a local solution and we used a genetic algorithm to generate numerous smart initial guesses to get a local minimum.
520 $a Once the calibration is done, we can get the 3d motion of every points of the body throughout the whole trial. With it, we get the acceleration and velocities of the body points along with the forces applied by each body segment. We can also calculate the angular momentum of each segment.
520 $a We found that the arms had a bigger impact on the lift of the body in two ways. The total body lift was not as important since the center of mass was not moving up and down as much. Also they have a bigger range of motion and are only moving in the upward direction during the contact phase due to a longer airborne phase. Sec- ondly, the arm contribution to drive is still close to zero in constant speed sprinting. The theory that your arm are helping you moving forward is not correct. Hinrichs (1982) showed that for distance runners, we can now say that is also the case for sprinters. Thirdly, the arms help balance the vertical angular momentum of the legs to be able to swing the legs during the airborne phase. This result applies for both sprinters and distance runners.
520 $a Finally, the classic style of arm-swing for track coaches is swinging the arms front and back without any side motion. There are reasons to believe that this theory is correct. It seems to be good for drive but we have seen that arms have no effects on drive. As long as the arms are coming high enough, they can cross over in front of the body. We also have shown that the arms crossing over is decreasing the side to side motion of the body center of mass.
590 $a School code: 0391.
650 4 $a Biophysics, Biomechanics. $3 1035342
650 4 $a Health Sciences, Recreation. $3 1018003
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690 $a 0575
710 2 $a Northern Arizona University. $b Physics and Astronomy. $3 2049743
773 0 $t Masters Abstracts International $g 51-06(E).
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791 $a M.S.
792 $a 2013
793 $a English
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