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Isokinetic training increases ulnar bending stiffness and bone mineral in young women.
Bone. 2007 Oct; 41(4):685-9.BONE

Abstract

Numerous studies have investigated the effects of physical activity on bone health; however, little is known about the effects of isokinetic strength training on bone. While bone mineral density (BMD) is widely used to assess bone health and fracture risk, there are several limitations of this measure that warrant new technology development to measure bone strength. The mechanical response tissue analyzer (MRTA) assesses bone strength by measuring maximal bending stiffness (EI). We hypothesized that isokinetic strength training of the elbow flexors and extensors would increase ulnar EI, BMD, and bone mineral content (BMC) in young women. Fifty-four women trained the nondominant arm 3 times per week for 20 weeks; 32 trained concentrically (CON) and 22 trained eccentrically (ECC). Subjects were assessed for the following variables pre- and post-training: CON and ECC peak torque of the elbow flexors and extensors with isokinetic dynamometry, ulnar mineral content and density using dual-energy X-ray absorptiometry, and ulnar EI using MRTA. Isokinetic training increased CON (17%) and ECC (17%) peak torque, even when controlling for changes in the untrained arm. Eccentric training increased CON and ECC peak torque while CON training improved CON peak torque only. Isokinetic training increased ulnar EI 28%, which was statistically greater than the untrained arm. Ulnar EI increased 25% with CON training and 32% with ECC training. Both training modes resulted in greater EI gains compared to the untrained limb. Isokinetic training increased ulnar BMC (2.7%) and BMD (2.3%), even when controlling for untrained ulna changes. Both training modalities resulted in BMC and BMD increases; however, only CON training yielded gains when controlling for changes in the untrained limb. In conclusion, isokinetic strength training increases ulnar EI, BMC, and BMD in young women; no statistical differences were noted between CON and ECC training modes.

Authors+Show Affiliations

Virginia Polytechnic Institute and State University, Blacksburg, VA, USA. millerle@vt.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

17693150

Citation

Miller, Larry E., et al. "Isokinetic Training Increases Ulnar Bending Stiffness and Bone Mineral in Young Women." Bone, vol. 41, no. 4, 2007, pp. 685-9.
Miller LE, Wootten DF, Nickols-Richardson SM, et al. Isokinetic training increases ulnar bending stiffness and bone mineral in young women. Bone. 2007;41(4):685-9.
Miller, L. E., Wootten, D. F., Nickols-Richardson, S. M., Ramp, W. K., Steele, C. R., Cotton, J. R., Carneal, J. P., & Herbert, W. G. (2007). Isokinetic training increases ulnar bending stiffness and bone mineral in young women. Bone, 41(4), 685-9.
Miller LE, et al. Isokinetic Training Increases Ulnar Bending Stiffness and Bone Mineral in Young Women. Bone. 2007;41(4):685-9. PubMed PMID: 17693150.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Isokinetic training increases ulnar bending stiffness and bone mineral in young women. AU - Miller,Larry E, AU - Wootten,David F, AU - Nickols-Richardson,Sharon M, AU - Ramp,Warren K, AU - Steele,Charles R, AU - Cotton,John R, AU - Carneal,James P, AU - Herbert,William G, Y1 - 2007/07/13/ PY - 2007/02/16/received PY - 2007/05/23/revised PY - 2007/07/06/accepted PY - 2007/8/19/pubmed PY - 2007/12/6/medline PY - 2007/8/19/entrez SP - 685 EP - 9 JF - Bone JO - Bone VL - 41 IS - 4 N2 - Numerous studies have investigated the effects of physical activity on bone health; however, little is known about the effects of isokinetic strength training on bone. While bone mineral density (BMD) is widely used to assess bone health and fracture risk, there are several limitations of this measure that warrant new technology development to measure bone strength. The mechanical response tissue analyzer (MRTA) assesses bone strength by measuring maximal bending stiffness (EI). We hypothesized that isokinetic strength training of the elbow flexors and extensors would increase ulnar EI, BMD, and bone mineral content (BMC) in young women. Fifty-four women trained the nondominant arm 3 times per week for 20 weeks; 32 trained concentrically (CON) and 22 trained eccentrically (ECC). Subjects were assessed for the following variables pre- and post-training: CON and ECC peak torque of the elbow flexors and extensors with isokinetic dynamometry, ulnar mineral content and density using dual-energy X-ray absorptiometry, and ulnar EI using MRTA. Isokinetic training increased CON (17%) and ECC (17%) peak torque, even when controlling for changes in the untrained arm. Eccentric training increased CON and ECC peak torque while CON training improved CON peak torque only. Isokinetic training increased ulnar EI 28%, which was statistically greater than the untrained arm. Ulnar EI increased 25% with CON training and 32% with ECC training. Both training modes resulted in greater EI gains compared to the untrained limb. Isokinetic training increased ulnar BMC (2.7%) and BMD (2.3%), even when controlling for untrained ulna changes. Both training modalities resulted in BMC and BMD increases; however, only CON training yielded gains when controlling for changes in the untrained limb. In conclusion, isokinetic strength training increases ulnar EI, BMC, and BMD in young women; no statistical differences were noted between CON and ECC training modes. SN - 8756-3282 UR - https://www.unboundmedicine.com/medline/citation/17693150/Isokinetic_training_increases_ulnar_bending_stiffness_and_bone_mineral_in_young_women_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S8756-3282(07)00560-1 DB - PRIME DP - Unbound Medicine ER -