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- W1967727436 abstract "While jumping exercise benefits bone, a specific dose-response to jump training has not been reported. PURPOSE: As part of a multi-year dose-response jumping study in premenopausal women, we report ground reaction forces (GRFs) for subjects participating in an unsupervised home-based jumping program. METHODS: Of 102 women randomly assigned to one of nine jumping groups, varying by height (4, 8, or 12) and repetitions (10, 50, or 100 jumps per day), or control, 76 completed jumps based on their group assignment at home three days per week for eight months (aged 23.4±4.5y). Subjects were pre- and post-tested for bone and nutritional status. During the pre-test visit, correct jumping technique was demonstrated and critiqued for each subject, and was the only demonstration they received. At post-test, subjects performed ten jumps onto a Kistler force platform from their prescribed box height using the technique they used at home. Average peak GRF and impulse (area under curve) was determined for peaks within each subject's mean +/- 1 SD after filtering (4th order Butterworth filter, 150 Hz). RESULTS: While repeated measures ANOVA showed no significant difference in average peak GRFs across the three height groups (3.4, 3.6, 3.9 times body weight for 4, 8, and 12 step, respectively; p>0.29), a significant difference in average impulse across the three height groups did exist (0.46, 0.52. 0.61; p<0.001). Therefore, subjects did not lower their center of gravity before beginning their descent, but did augment their landing to dampen the force of the fall (e.g. landed toes first or used deep knee bend). Previous laboratory-based studies have shown GRFs of over 6 times body weight for a 12 drop. CONCLUSION: Subjects who perform a jumping program at home may unknowingly adopt a landing strategy to dampen the force of impact to prevent discomfort or perceived risk of injury. Our observations add to a growing body of research suggesting perceptual and physical accommodation techniques that humans adopt when navigating risky environmental features. This study further suggests a potential weakness of unsupervised studies where a subject's form and compliance to a protocol cannot be monitored closely. Future home-based studies should follow-up with subjects and/or monitor compliance to the protocol on a regular basis." @default.
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- W1967727436 date "2010-05-01" @default.
- W1967727436 modified "2023-09-25" @default.
- W1967727436 title "Landing Strategies May Attenuate Peak Ground Reaction Forces in a Home-Based Jumping Program in Premenopausal Women" @default.
- W1967727436 doi "https://doi.org/10.1249/01.mss.0000384715.05014.c1" @default.
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