LEADER 04217ctm 2200589 i 4500001 ocn311096985 003 OCoLC 005 20221026165717.0 008 090227s2008 xx ak bm 000 0 eng d 035 (Sirsi) o311096985 035 (OCoLC)311096985 040 ERE |beng |erda |cERE |dNCECU |dOCLCQ |dOCLCO |dOCLCF |dOCLCQ |dOCLCO |dOCL |dOCLCQ |dOCLCO |dERE |dUtOrBLW 049 EREE 050 14 QP321 |b.B885 2008 100 1 Bushey, Erin B., |eauthor. |?UNAUTHORIZED 245 10 Muscles generate more energy in ascending gaits than they dissipate in descending gaits / |cby Erin B. Bushey. 264 0 |c2008. 300 45 leaves : |billustrations, forms ; |c29 cm 336 text |btxt |2rdacontent 337 unmediated |bn |2rdamedia 338 volume |bnc |2rdacarrier 502 |bM.S. |cEast Carolina University |d2008 500 Presented to the faculty of the Department of Exercise and Sport Science. 500 Advisor: Paul DeVita 520 3 Despite equal changes in energy, the amount of muscle work from joint powers is greater while walking up vs. down an incline or stairway. We previously hypothesized a generalized biomechanical principle that muscles generate more mechanical energy during gait tasks that raise the body center of mass compared to the energy they dissipate during gait tasks that lower the center of mass. The purpose of this study was to compare the work produced by the lower extremity muscles during ascending and descending running. Twenty-six people were tested during level, and ascent and descent running on a 10° ramp. Lower extremity joint powers and work were calculated through inverse dynamics. We assumed this work quantified muscle contributions to changes in energy. Total work per stride was calculated from the change in total energy per stride in each task. Joint work for both limbs during descent, level, and ascent were -142 (±36), 27 (±17), and 203 (±34) J. The magnitude of joint work was 1.43 fold greater during ascent than descent. All sample means were significantly different from each other, p<0.05. Total work per stride during descent and ascent had magnitudes of-198 (±77), and 237 (±86) J respectively and were not significantly different. Joint work accounted for 72% of the total energy change during descent running and 86% during ascent running. Lower extremity muscles produced more work as calculated through joint powers and are responsible for more of the total work during ascent vs. descent running. The hypothesis was supported and appears to describe a robust biomechanical phenomenon. 504 Includes bibliographical references (leaves 38-41). 650 0 Muscles |xMotility. |=^A106182 650 0 Energy metabolism. |=^A1662 650 0 Gait in humans. |=^A231004 650 0 Human locomotion. |=^A3913 650 2 Energy Metabolism |0(DNLM)D004734 |=^A918215 650 2 Gait |0(DNLM)D005684 |=^A920242 655 2 Academic Dissertation. |0(DNLM)D019478 |?UNAUTHORIZED 650 7 Energy metabolism. |2fast |0(OCoLC)fst00910189 650 7 Gait in humans. |2fast |0(OCoLC)fst00937068 650 7 Human locomotion. |2fast |0(OCoLC)fst00963159 650 7 Muscles |xMotility. |2fast |0(OCoLC)fst01029977 655 7 Academic theses. |2fast |0(OCoLC)fst01726453 655 7 Academic theses. |2lcgft 655 7 Thèses et écrits académiques. |2rvmgf |0(CaQQLa)RVMGF-000001173 700 1 DeVita, Paul, |d1955- |edegree supervisor. |?UNAUTHORIZED 710 2 East Carolina University. |bDepartment of Exercise and Sport Science. |?UNAUTHORIZED 856 41 |zAccess via ScholarShip |uhttp://hdl.handle.net/10342/10329 949 Click on web address |wasis |hjoyner101 949 Click on web address |wasis |hhsl111 994 C0 |bERE 596 1 4 998 1457161 998 1457161