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Effects of exercise involving predominantly either joint-reaction or ground-reaction forces on bone mineral density in older women.
J Bone Miner Res 1997; 12(8):1253-61JB

Abstract

This study compared the effects of two exercise training programs, 11 months in duration, on bone mineral density (BMD) in older, sedentary women. Thirty-nine women, aged 60-74 years, were assigned to the following groups: (a) a group that performed exercises that introduced stress to the skeleton through ground-reaction forces (GRF) (i.e., walking, jogging, stairs); (b) a group that performed exercises that introduced stress to the skeleton through joint-reaction forces (JRF) (i.e., weight lifting, rowing); or (c) a no-exercise control group. BMD of the whole body, lumbar spine, proximal femur, and distal forearm was assessed five times at approximately 3-month intervals. The GRF and JRF exercise programs resulted in significant and similar increases in BMD of the whole body (2.0 +/- 0.8% and 1.6 +/- 0.4%, respectively), lumbar spine (1.8 +/- 0.7% and 1.5 +/- 0.5%, respectively), and Ward's triangle region of the proximal femur (6.1 +/- 1.5% and 5.1 +/- 2.1%, respectively). There was a significant in BMD of the femoral neck only in response to the GRF exercise program (GRF, 3.5 +/- 0.8%; JRF, -0.2 +/- 0.7%). There were no significant changes in BMD in control subjects. Among all exercisers, there was a significant inverse (r = -0.52, p < 0.01) relationship between increases in whole body BMD and reductions in fat mass, suggesting a dose response effect of exercise on bone mass. Although femoral neck BMD was responsive only to the GRF exercise program, some adaptations (i.e., increase in lean body mass and strength) that were specific to the JRF exercise program may be important in preventing osteoporotic fractures by reducing the risk for falls. It remains to be determined whether all of these benefits can be gained through a training program that combines the different types of exercises employed in this study.

Authors+Show Affiliations

Washington University School of Medicine, Department of Internal Medicine, St. Louis, Missouri, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Controlled Clinical Trial
Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

9258756

Citation

Kohrt, W M., et al. "Effects of Exercise Involving Predominantly Either Joint-reaction or Ground-reaction Forces On Bone Mineral Density in Older Women." Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research, vol. 12, no. 8, 1997, pp. 1253-61.
Kohrt WM, Ehsani AA, Birge SJ. Effects of exercise involving predominantly either joint-reaction or ground-reaction forces on bone mineral density in older women. J Bone Miner Res. 1997;12(8):1253-61.
Kohrt, W. M., Ehsani, A. A., & Birge, S. J. (1997). Effects of exercise involving predominantly either joint-reaction or ground-reaction forces on bone mineral density in older women. Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research, 12(8), pp. 1253-61.
Kohrt WM, Ehsani AA, Birge SJ. Effects of Exercise Involving Predominantly Either Joint-reaction or Ground-reaction Forces On Bone Mineral Density in Older Women. J Bone Miner Res. 1997;12(8):1253-61. PubMed PMID: 9258756.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of exercise involving predominantly either joint-reaction or ground-reaction forces on bone mineral density in older women. AU - Kohrt,W M, AU - Ehsani,A A, AU - Birge,S J,Jr PY - 1997/8/1/pubmed PY - 2001/3/28/medline PY - 1997/8/1/entrez SP - 1253 EP - 61 JF - Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research JO - J. Bone Miner. Res. VL - 12 IS - 8 N2 - This study compared the effects of two exercise training programs, 11 months in duration, on bone mineral density (BMD) in older, sedentary women. Thirty-nine women, aged 60-74 years, were assigned to the following groups: (a) a group that performed exercises that introduced stress to the skeleton through ground-reaction forces (GRF) (i.e., walking, jogging, stairs); (b) a group that performed exercises that introduced stress to the skeleton through joint-reaction forces (JRF) (i.e., weight lifting, rowing); or (c) a no-exercise control group. BMD of the whole body, lumbar spine, proximal femur, and distal forearm was assessed five times at approximately 3-month intervals. The GRF and JRF exercise programs resulted in significant and similar increases in BMD of the whole body (2.0 +/- 0.8% and 1.6 +/- 0.4%, respectively), lumbar spine (1.8 +/- 0.7% and 1.5 +/- 0.5%, respectively), and Ward's triangle region of the proximal femur (6.1 +/- 1.5% and 5.1 +/- 2.1%, respectively). There was a significant in BMD of the femoral neck only in response to the GRF exercise program (GRF, 3.5 +/- 0.8%; JRF, -0.2 +/- 0.7%). There were no significant changes in BMD in control subjects. Among all exercisers, there was a significant inverse (r = -0.52, p < 0.01) relationship between increases in whole body BMD and reductions in fat mass, suggesting a dose response effect of exercise on bone mass. Although femoral neck BMD was responsive only to the GRF exercise program, some adaptations (i.e., increase in lean body mass and strength) that were specific to the JRF exercise program may be important in preventing osteoporotic fractures by reducing the risk for falls. It remains to be determined whether all of these benefits can be gained through a training program that combines the different types of exercises employed in this study. SN - 0884-0431 UR - https://www.unboundmedicine.com/medline/citation/9258756/Effects_of_exercise_involving_predominantly_either_joint_reaction_or_ground_reaction_forces_on_bone_mineral_density_in_older_women_ L2 - https://doi.org/10.1359/jbmr.1997.12.8.1253 DB - PRIME DP - Unbound Medicine ER -