Tags

Type your tag names separated by a space and hit enter

Concentric and eccentric isokinetic resistance training similarly increases muscular strength, fat-free soft tissue mass, and specific bone mineral measurements in young women.
Osteoporos Int. 2007 Jun; 18(6):789-96.OI

Abstract

Women participated in 5 months of unilateral concentric (n = 37) or eccentric (n = 33) isokinetic resistance training of the legs and arms. Limb muscular strength increased as did total body, leg, and arm fat-free soft tissue mass, total body BMC, hip BMD, and forearm BMC and BMD. Isokinetic training benefits bone mineral acquisition.

INTRODUCTION AND HYPOTHESIS

Isokinetic resistance training (IRT) is osteogenic; however, it is not known if concentric or eccentric modalities of IRT produce differential effects on bone. We tested our hypothesis that high-load eccentric versus concentric mode of IRT would produce greater increases in muscular strength, fat-free soft tissue mass (FFSTM), bone mineral density (BMD) and content (BMC) in trained legs and arms.

METHODS

Participants were randomized to 5 months of concentric (n = 37) or eccentric (n = 33) training. The non-dominant leg and arm were used during training; dominant limbs served as controls. Muscular strength was measured with an isokinetic dynamometer; body composition was measured by dual-energy X-ray absorptiometry.

RESULTS

Muscular strength of the concentrically and eccentrically trained leg (18.6%; 28.9%) and arm (12.5%; 24.6%) significantly increased with training. Gains in total body (TB) BMC (p < 0.05) and, in the trained limbs, total proximal femur BMD (p < 0.05) and total forearm BMD (p < 0.05) and BMC (p < 0.05) occurred in both groups. FFSTM increased for the TB and trained leg and arm (all p < 0.001) in both modes.

CONCLUSION

Regardless of the mode, high-intensity, slow-velocity IRT increases muscular strength and FFSTM of trained limbs and imparts benefits to TB BMC and site-specific BMD and BMC in young women.

Authors+Show Affiliations

Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA 16802, USA. smn13@psu.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

17264975

Citation

Nickols-Richardson, S M., et al. "Concentric and Eccentric Isokinetic Resistance Training Similarly Increases Muscular Strength, Fat-free Soft Tissue Mass, and Specific Bone Mineral Measurements in Young Women." Osteoporosis International : a Journal Established as Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA, vol. 18, no. 6, 2007, pp. 789-96.
Nickols-Richardson SM, Miller LE, Wootten DF, et al. Concentric and eccentric isokinetic resistance training similarly increases muscular strength, fat-free soft tissue mass, and specific bone mineral measurements in young women. Osteoporos Int. 2007;18(6):789-96.
Nickols-Richardson, S. M., Miller, L. E., Wootten, D. F., Ramp, W. K., & Herbert, W. G. (2007). Concentric and eccentric isokinetic resistance training similarly increases muscular strength, fat-free soft tissue mass, and specific bone mineral measurements in young women. Osteoporosis International : a Journal Established as Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA, 18(6), 789-96.
Nickols-Richardson SM, et al. Concentric and Eccentric Isokinetic Resistance Training Similarly Increases Muscular Strength, Fat-free Soft Tissue Mass, and Specific Bone Mineral Measurements in Young Women. Osteoporos Int. 2007;18(6):789-96. PubMed PMID: 17264975.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Concentric and eccentric isokinetic resistance training similarly increases muscular strength, fat-free soft tissue mass, and specific bone mineral measurements in young women. AU - Nickols-Richardson,S M, AU - Miller,L E, AU - Wootten,D F, AU - Ramp,W K, AU - Herbert,W G, Y1 - 2007/01/31/ PY - 2006/09/02/received PY - 2006/11/22/accepted PY - 2007/2/1/pubmed PY - 2007/7/27/medline PY - 2007/2/1/entrez SP - 789 EP - 96 JF - Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA JO - Osteoporos Int VL - 18 IS - 6 N2 - UNLABELLED: Women participated in 5 months of unilateral concentric (n = 37) or eccentric (n = 33) isokinetic resistance training of the legs and arms. Limb muscular strength increased as did total body, leg, and arm fat-free soft tissue mass, total body BMC, hip BMD, and forearm BMC and BMD. Isokinetic training benefits bone mineral acquisition. INTRODUCTION AND HYPOTHESIS: Isokinetic resistance training (IRT) is osteogenic; however, it is not known if concentric or eccentric modalities of IRT produce differential effects on bone. We tested our hypothesis that high-load eccentric versus concentric mode of IRT would produce greater increases in muscular strength, fat-free soft tissue mass (FFSTM), bone mineral density (BMD) and content (BMC) in trained legs and arms. METHODS: Participants were randomized to 5 months of concentric (n = 37) or eccentric (n = 33) training. The non-dominant leg and arm were used during training; dominant limbs served as controls. Muscular strength was measured with an isokinetic dynamometer; body composition was measured by dual-energy X-ray absorptiometry. RESULTS: Muscular strength of the concentrically and eccentrically trained leg (18.6%; 28.9%) and arm (12.5%; 24.6%) significantly increased with training. Gains in total body (TB) BMC (p < 0.05) and, in the trained limbs, total proximal femur BMD (p < 0.05) and total forearm BMD (p < 0.05) and BMC (p < 0.05) occurred in both groups. FFSTM increased for the TB and trained leg and arm (all p < 0.001) in both modes. CONCLUSION: Regardless of the mode, high-intensity, slow-velocity IRT increases muscular strength and FFSTM of trained limbs and imparts benefits to TB BMC and site-specific BMD and BMC in young women. SN - 0937-941X UR - https://www.unboundmedicine.com/medline/citation/17264975/Concentric_and_eccentric_isokinetic_resistance_training_similarly_increases_muscular_strength_fat_free_soft_tissue_mass_and_specific_bone_mineral_measurements_in_young_women_ L2 - https://doi.org/10.1007/s00198-006-0305-9 DB - PRIME DP - Unbound Medicine ER -