The free moment of ground reaction in distance running and its changes with pronation.
The objectives of this study were (a) to document the free moment of ground reaction in a homogeneous group of subjects running in conventional shoes at a typical distance running speed of 4.5 m/s, and (b) to investigate changes in the free moment caused by changes in pronation. Ten male runners who...
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| Format: | Thesis Electronic eBook |
| Language: | English |
| Published: |
1984
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| Online Access: | Static URL is not available. In OregonPDF, search for the Author using the All tab. Static URL is not available. In OregonPDF, search for the Author using the All tab |
MARC
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| 100 | 1 | |a Holden, John Patrick. | |
| 245 | 1 | 4 | |a The free moment of ground reaction in distance running and its changes with pronation. |
| 260 | |c 1984 | ||
| 300 | |a 107 pgs. | ||
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| 502 | |c Pennsylvania State University |d 1984 | ||
| 520 | |a The objectives of this study were (a) to document the free moment of ground reaction in a homogeneous group of subjects running in conventional shoes at a typical distance running speed of 4.5 m/s, and (b) to investigate changes in the free moment caused by changes in pronation. Ten male runners who were not using orthoses, did not have high or flat arches, and demonstrated a normal heelstriking style were selected as subjects. Each subject ran five trials for each foot in each of three shoe conditions which tended to place the feet into varus, neutral, or valgus postitions during standing. A Kistler force platform provided force outputs which were processed digitally to determine ground reaction forces and moments. For the neutral shoe trials, a net ankle moment was calculated from the ground reactions acting in the surface plane about a fixed point on the shoe. Using this moment, a relative value of the friction coefficient required to prevent foot rotation was determined. The results were related to previously presented data on foot slip. The mediolateral force component varied dramatically during the first 20% of foot contact due to the three footwear conditions. The trend from varus to neutral to valgus shoes (i.e., with increased pronation) was for a larger intial peak force applied medially to the foot, followed by a more delayed peak lateral force. The free moment acted on the foot in the direction of internal rotation during a majority of the foot contact duration. The largest magnitudes were observed during the first half of contact, although absolute values varied considerably between individual feet. The largest differences due to shoe type were also observed during early support, and the clear trend with increased pronation was for increased free moment in the direction of internal rotation. Both the peak values and the angular impulses in this direction were significantly increased from the varus to neutral to valgus shoes. These changes are the opposite direction to those which might have been expected based on statements in the literature. | ||
| 533 | |a Electronic reproduction. |b Eugene : |c Kinesiology Publications, University of Oregon. |n Mode of access: World Wide Web; requires Adobe Acrobat Reader. | ||
| 655 | 7 | |a Academic theses |2 lcgft | |
| 690 | 0 | 0 | |a DISTANCE RUNNING |
| 690 | 0 | 0 | |a MEASUREMENT |
| 690 | 0 | 0 | |a GROUND REACTION FORC |
| 690 | 0 | 0 | |a MAN |
| 690 | 0 | 0 | |a FORCE PLATE |
| 690 | 0 | 0 | |a TRACK AND FIELD |
| 690 | 0 | 0 | |a PRONATION |
| 690 | 0 | 0 | |a SHOES |
| 710 | 2 | |a Pennsylvania State University, |e degree granting institution. | |
| 730 | 0 | |a OregonPDF online | |
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| 952 | f | f | |a Middle Tennessee State University |b Main |c James E. Walker Library |d Electronic Resources |t 0 |h Library of Congress classification |
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