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- W2046983516 abstract "PURPOSE To determine the effect of walking grade on internal mechanical work (WIM), observed mechanical work (WOM), and total body work (WTB). METHODS Twelve male subjects (22.7 ± 1.1 yr) walked with a 27.2 kg backpack (BP) on a treadmill at 1.34 ms−1 at 3 grades (−8%, 0, 8%). BP center of mass (COM) location and moment of inertia were constant for all conditions. WIM was calculated by summing the potential energy (PE) and kinetic energy (KE) for each segment, and then across body segments. WOM, assuming no exchange of PE or KE within or between body segments, treated each segment as an individual entity. Within but not between segment work, WTB, summed the absolute changes of the total energy of each segment over the stride cycle. RESULTS See Table.Table: No Caption AvailableCONCLUSIONS The COM of each body segment must be raised and lowered to a greater extent in graded walking than level walking. Our calculations take into account the velocity and vertical position of each segment's COM; the differences found are likely due to changes in KE and PE associated with the raising and lowering of each segment. Cavagna et al (1977) showed energy transfers account for 70% of the total energy changes during level walking. Our findings show a slightly greater proportion; the lowest percent occurred during decline walking and the greatest during incline walking. WTB values were consistently 2/3 of WOM for all walking grades, the same proportion Pierrynowski (1981) found across various BP mass conditions." @default.
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- W2046983516 date "2003-05-01" @default.
- W2046983516 modified "2023-09-26" @default.
- W2046983516 title "THE EFFECT OF WALKING GRADE ON MECHANICAL WORK AND ENERGY TRANSFER DURING LOAD CARRIAGE" @default.
- W2046983516 doi "https://doi.org/10.1097/00005768-200305001-00106" @default.
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