To examine the potential for exercise to build bone mass during growth, objectives
of this dissertation included: 1) determine the effects of 7 months of jumping
followed by 7 months of detraining on hip and spine bone mass in the prepubertal
children; 2) determine variables that best predict bone mineral content (BMC;g) of
the hip and spine in order to develop prediction equations for healthy, Caucasian
children, specific to Hologic fan-beam DXA machines; and 3) to examine the
potential synergy between calcium intake and the bone response to jump training in
prepubertal children. Results/Conclusions Objective 1 (Chapters 2, 3 and 4): children
who performed 300 jumps/week at a load magnitude of 8 body weights had
significantly greater 7-month changes for BMC at the femoral neck and lumbar spine
than controls (4.5% and 3.1%, respectively), and significantly greater 7-month
changes for bone area (BA; cm��) at the femoral neck than controls (2.9%). After 7-
months of detraining (no box jumping exercises) the jumping group maintained 4%
greater BMC and 4% greater BA at the femoral neck than controls. By contrast, at
the spine, gains in BMC from the intervention were not retained after an equivalent
period of detraining. These data indicate that high-impact jumping enhances growth
at the hip. Results/Conclusions Objective 2 (Chapter 5): Age, height, and weight
were entered as predictor variables in order to create regression models for healthy,
young Caucasian boys and girls. Of these, height and weight independently predicted
femoral neck and total hip BMC in both boys (femoral neck: R��=.48, total hip: R��=.63) and girls (femoral neck: R��=.49, total hip R��=.65). Height best predicted spine
BMC in boys (R��=.58), but both height and weight independently predicted spine
BMC in girls (R��=.54). We report that height and weight not age, best predict bone
mineral content at the hip and spine. Results/Conclusions Objective 3 (Chapter 6):
Children responded similarly to the jumping program regardless of calcium intake.
73% of our population had dietary intakes of calcium that met the recommended
values for their age group. / Graduation date: 2002
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/32621 |
| Date | 29 April 2002 |
| Creators | Fuchs, Robyn K. |
| Contributors | Snow, Christine |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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