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Short-term Retention Of Gait Changes After Real-time Feedback To Reduce Tibial Shock: 1824 3:00 PM - 3:15 PM

Crowell, Harrison P.1; Milner, Clare E.1; Davis, Irene S. FACSM1; Hamill, Joseph FACSM2

Medicine & Science in Sports & Exercise: May 2005 - Volume 37 - Issue 5 - p S346
F-13: Free Communication/Slide – Running Mechanics and Injury: FRIDAY, JUNE 3, 2005 2:00 PM - 3:30 PM ROOM: Jackson A

1 University of Delaware, Newark, DE

2University of Massachusetts, Amherst, MA


Previous studies of runners have established that higher than normal tibial shock, vertical loading rate, and vertical impact peak are related to stress fractures. If runners who have high values for these variables can be trained to reduce them, it may reduce their risk of stress fractures.

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To determine if runners can use real-time visual feedback from an accelerometer to reduce their tibial shock and loading.

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This is an ongoing study in which data have been collected from five subjects. An accelerometer was attached to the distal tibia of each subject. Subjects ran on a force measuring treadmill at a self-selected pace (5.4 – 5.9 mph). Tibial shock and ground reaction force data were collected after a 5 minute warm-up (PRE), 10 minute session of visual tibial shock feedback (FB), and 10 minute session without feedback (NOFB). These periods were consecutive, and they were followed by a cool-down period.

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Three of the five subjects showed large reductions (between 25 and 48%) in their peak tibial shock (PTS), average loading rate (ALR), and impact peak (IP) at the end of this very brief training session, and short-term retention occurred after feedback was removed. The mean results for all five subjects are reported below.



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This preliminary study provides evidence that some runners can use real-time feedback to achieve short-term reductions in their tibial shock and ground reaction forces.

©2005The American College of Sports Medicine