Universität zu Köln

Holzer, D., Epro, G., McCrum, C., Doerner, J., Luetkens, J. A., Scheef, L., Kukuk, G. M., Boecker, H., Mierau, A., Brueggemann, G. -P., Maganaris, C. N. and Karamanidis, K. (2018). The role of muscle strength on tendon adaptability in old age. Eur. J. Appl. Physiol., 118 (11). S. 2269 - 2280. NEW YORK: SPRINGER. ISSN 1439-6327

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Abstract

Purpose The purpose of the study was to determine: (1) the relationship between ankle plantarflexor muscle strength and Achilles tendon (AT) biomechanical properties in older female adults, and (2) whether muscle strength asymmetries between the individually dominant and non-dominant legs in the above subject group were accompanied by inter-limb AT size differences. Methods The maximal generated AT force, AT stiffness, AT Young's modulus, and AT cross-sectional area (CSA) along its length were determined for both legs in 30 women (65 +/- 7 years) using dynamometry, ultrasonography, and magnetic resonance imaging. Results No between-leg differences in triceps surae muscle strength were identified between dominant (2798 +/- 566 N) and non-dominant limb (2667 +/- 512 N). The AT CSA increased gradually in the proximo-distal direction, with no differences between the legs. There was a significant correlation (P < 0.05) of maximal AT force with AT stiffness (r = 0.500) and Young's modulus (r = 0.414), but only a tendency with the mean AT CSA. However, region-specific analysis revealed a significant relationship between maximal AT force and the proximal part of the AT, indicating that this region is more likely to display morphological adaptations following an increase in muscle strength in older adults. Conclusions These findings demonstrate that maximal force-generation capabilities play a more important role in the variation of AT stiffness and material properties than in tendon CSA, suggesting that exercise-induced increases in muscle strength in older adults may lead to changes in tendon stiffness foremost due to alterations in material rather than in its size.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Holzer, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Epro, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED McCrum, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Doerner, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luetkens, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scheef, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kukuk, G. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boecker, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mierau, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brueggemann, G. -P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maganaris, C. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karamanidis, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-166829
DOI:	10.1007/s00421-018-3947-3
Journal or Publication Title:	Eur. J. Appl. Physiol.
Volume:	118
Number:	11
Page Range:	S. 2269 - 2280
Date:	2018
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1439-6327
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HUMAN ACHILLES-TENDON; TRICEPS SURAE MUSCLE; STRUCTURES IN-VIVO; MECHANICAL-PROPERTIES; PATELLAR TENDON; CYCLIC STRAIN; MORPHOLOGICAL PROPERTIES; VISCOELASTIC PROPERTIES; EXTRACELLULAR-MATRIX; SKELETAL-MUSCLE Multiple languages Physiology; Sport Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16682