Anisotropic and Biomechanical Properties of Tendons Modified by Exercise and Denervation: Aggregation and Macromolecular Order in Collagen Bundles

Vilarta, Roberto; Vidal, Benedicto de Campos

doi:10.1016/s0934-8832(89)80019-8

Cited by 118 publications

(83 citation statements)

References 6 publications

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“…If, as previous studies have supposed, the aggregation and orientation of macromolecular components in the extracellular matrix are influenced by the magnitude, direction, duration, and frequency of the mechanical stimulus to the connective tissues (Vilarta and Vidal, 1989), then the periodontal fibrous architecture probably reflects a biological adaptation to the mechanical environment. It has been argued that the thick parallel fiber bundles in the tooth-and bone-related areas might be intimately related to tissues that are subjected to large tensile loadings while performing their physiological functions (Gathercole and Keller, 1982;Komatsu and Viidik, 1996;Komatsu and Chiba, 2001).…”

Section: Discussionmentioning

confidence: 86%

Polarized light microscopic analyses of collagen fibers in the rat incisor periodontal ligament in relation to areas, regions, and ages

Komatsu¹,

Mosekilde²,

Viidik³

et al. 2002

Anat. Rec.

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We prepared decalcified sagittal sections (20 m thick) from the incisal, middle, and basal regions of the mandibular incisor of male Wistar rats aged 2, 6, 12, and 24 months, and examined the sections using polarized light microscopy. Most of the birefringent fibers appeared to run obliquely across the periodontal ligament. Birefringent fibers running parallel to the long axis of the incisor were also found in the intermediate area of the ligament. Similar fiber architecture was observed in all four age groups. Quantitative analysis showed that the retardation values of collagen were higher in the bone-and tooth-related areas and lower in the intermediate area of the ligament. The values for the bone-and tooth-related areas increased from the basal toward the incisal regions in all four age groups. Age-related changes in the retardation values were found only in the incisal region of the incisor. In the incisal region, the values for the bone-and tooth-related areas increased markedly from 2-24 months of age, whereas those for the intermediate area increased slightly but significantly with age. Our findings indicate that the degrees of molecular organization and alignment of collagen fibers in the bone-and tooth-related areas of the ligament are higher than those in the intermediate area and increase near the incisal region and with age. It is also suggested that the collagen fibers in the intermediate area remain immature along the long axis of the incisor throughout the life span of the animal. Anat Rec 268: 381-387, 2002.

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Section: Discussionmentioning

confidence: 86%

Polarized light microscopic analyses of collagen fibers in the rat incisor periodontal ligament in relation to areas, regions, and ages

Komatsu¹,

Mosekilde²,

Viidik³

et al. 2002

Anat. Rec.

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“…Considering these ®ndings, it seems that the dierence in MTC compliance between LDR and CON might be attributable to the dierence in muscle ®bre composition, which has been considered to be inuenced largely by genetic factors (Komi et al 1977). In addition to the above quoted training studies, however, some researchers have shown that physical loading on the tendon increases the number, diameter and degree of alignment of the constituent collagen ®bres (Michna 1984;Nakagawa et al 1988;Vilarta and Vidal 1989). Moreover, Nakagawa et al (1989) have observed that the cross-sectional area of the Achilles tendon in LDR was signi®cantly greater compared to that in untrained individuals.…”

Section: Discussionmentioning

confidence: 99%

“…Previous ®ndings obtained from animal experiments have shown that the properties of tendons may be changed by physical training (Vilarta and Vidal 1989;Woo et al 1981), immobilization (Vailas et al 1988) or aging (Shadwich 1990). It is well known that a muscle changes its morphological and functional pro®les in accordance with the extent of use and disuse during daily life.…”

Section: Introductionmentioning

confidence: 99%

Elastic properties of muscle-tendon complex in long-distance runners

Kubo¹,

Kanehisa²,

Kawakami³

et al. 2000

European Journal of Applied Physiology

108

106

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The purpose of this study was to investigate the elastic properties of muscle-tendon complex (MTC) in knee extensor muscles and the capacity for elastic energy utilization in long-distance runners (LDR) by comparing with data obtained from untrained individuals (CON). The elongation (L) of the tendon and aponeurosis of vastus lateralis muscle during isometric knee extension was determined by real-time brightness mode ultrasonography, while the subjects developed a gradually increasing torque from 0 (relaxed) to maximal effort (MVC) within 7 s. In addition, performances in two kinds of maximal vertical jumps, i.e. squatting (SJ) and counter-movement jumps (CMJ), were measured. The relationship between L muscle and force (F) was curvilinear and consisted of an initial region (toe region), characterized by a large increase in L with increasing F, immediately followed by a linear region. The slope of the regression equation for the L-F relationship in the range 50%-100% of MVC was defined as an index of MTC compliance, where the rate of the changes in L to that in muscle F at every 10% of MVC became almost constant. The maximal L (Lmax) and MTC compliance were significantly lower in LDR than in CON: 29.9 (SD 3.9) mm in LDR compared to 33.3 (SD 5.5) mm in CON for Lmax and 1.55 (SD 0.25) x 10(-2) mm.N-1 in LDR compared to 1.88 (SD 0.82) x 10(-2) mm.N-1 in CON for MTC compliance. Also, LDR showed significantly less elastic energy absorption (Ee) than CON, defined as the area below the L-F relationship curve from 0 to 100% of MVC. Not only jump heights but also the differences between the heights in SJ and CMJ, expressed as the percentage of the height in SJ, were significantly lower in LDR than in CON. The augmentation with counter-movement was significantly correlated to either MTC compliance (r = 0.554, P < 0.05) or Ee (r = 0.563, P < 0.05). Thus, the present results would indicate that MTC of vastus lateralis muscle is less compliant and its potential for energy storage during MTS lengthening is lower in LDR than untrained individuals. These elastic profiles of vastus lateralis muscle in LDR may be associated with their lower performances during CMJ.

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“…While age-related sarcopenia has been repeatedly documented, the effect of aging on tendon biomechanical properties is inconclusive 74,[79][80][81][82][83] . Methodological differences make study comparisons difficult, although the majority of investigators have suggested that collagen loss occurs in older individuals [84][85][86] . A substantial component of age-related strength loss may be the result of inactivity and can be modified by an appropriate exercise program [87][88][89][90][91][92] .…”

Section: Clinical Applicationsmentioning

confidence: 99%

The Role of Mechanical Loading in Tendon Development, Maintenance, Injury, and Repair

Galloway

Lalley

Shearn

2013

Journal of Bone and Joint Surgery

217

192

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Anisotropic and Biomechanical Properties of Tendons Modified by Exercise and Denervation: Aggregation and Macromolecular Order in Collagen Bundles

Cited by 118 publications

References 6 publications

Polarized light microscopic analyses of collagen fibers in the rat incisor periodontal ligament in relation to areas, regions, and ages

Polarized light microscopic analyses of collagen fibers in the rat incisor periodontal ligament in relation to areas, regions, and ages

Elastic properties of muscle-tendon complex in long-distance runners

The Role of Mechanical Loading in Tendon Development, Maintenance, Injury, and Repair

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