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Comparison of Upright Gait with Supine Bungee-Cord GaitRunning on a treadmill with bungee-cord resistance is currently used on the Russian space station MIR as a countermeasure for the loss of bone and muscular strength which occurs during spaceflight. However, it is unknown whether ground reaction force (GRF) at the feet using bungee-cord resistance is similar to that which occurs during upright walking and running on Earth. We hypothesized-that the DRAMs generated during upright walking and running are greater than the DRAMs generated during supine bungee-cord gait. Eleven healthy subjects walked (4.8 +/- 0.13 km/h, mean +/- SE) and ran (9.1 +/- 0.51 km/h) during upright and supine bungee-cord exercise on an active treadmill. Subjects exercised for 3 min in each condition using a resistance of 1 body weight calibrated during an initial, stationary standing position. Data were sampled at a frequency of 500Hz and the mean of 3 trials was analyzed for each condition. A repeated measures analysis of variance tested significance between the conditions. Peak DRAMs during upright walking were significantly greater (1084.9 +/- 111.4 N) than during supine bungee-cord walking (770.3 +/- 59.8 N; p less than 0.05). Peak GRFs were also significantly greater for upright running (1548.3 +/- 135.4 N) than for supine bungee-cord running (1099.5 +/- 158.46 N). Analysis of GRF curves indicated that forces decreased throughout the stance phase for bungee-cord gait but not during upright gait. These results indicate that bungee-cord exercise may not create sufficient loads at the feet to counteract the loss of bone and muscular strength that occurs during long-duration exposure to microgravity.
Document ID
Acquisition Source
Ames Research Center
Document Type
Boda, Wanda L.
(NASA Ames Research Center Moffett Field, CA United States)
Hargens, Alan R.
(NASA Ames Research Center Moffett Field, CA United States)
Campbell, J. A.
Yang, C.
Holton, Emily M.
Date Acquired
August 20, 2013
Publication Date
January 1, 1998
Subject Category
Aerospace Medicine
Meeting Information
Meeting: Experimental Biology ''98
Location: San Francisco, CA
Country: United States
Start Date: April 18, 1998
End Date: April 22, 1998
Funding Number(s)
PROJECT: RTOP 199-80-02-05
Distribution Limits
Work of the US Gov. Public Use Permitted.

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