Triceps-surae musculotendinous stiffness: Relative differences between obese and non-obese postmenopausal women

Faria, Aurélio; Gabriel, Ronaldo; Abrantes, João; Brás, Rui; Moreira, Helena

doi:10.1016/j.clinbiomech.2009.07.015

Cited by 38 publications

(50 citation statements)

References 32 publications

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“…Adaptations in musculo-tendinous stiffness could also have a favorable effect on the rate of force development and thus on the muscle power produced during "explosive" movements, and during eccentric contractions. Interestingly, it has recently been reported that weight-related additional loading resulted in a greater stiffness of the triceps surae musculo-tendinous unit in obese children [22•] and postmenopausal women [23]. This higher musculo-tendinous stiffness in obese people, which could be the consequence of fat infiltration into skeletal muscle and increased inter-muscular adipose tissue [23], could partly explain their higher absolute and relative (i.e., per unit muscle size) muscle power.…”

Section: Impact Of Obesity On Muscle Strengthmentioning

confidence: 99%

“…Interestingly, it has recently been reported that weight-related additional loading resulted in a greater stiffness of the triceps surae musculo-tendinous unit in obese children [22•] and postmenopausal women [23]. This higher musculo-tendinous stiffness in obese people, which could be the consequence of fat infiltration into skeletal muscle and increased inter-muscular adipose tissue [23], could partly explain their higher absolute and relative (i.e., per unit muscle size) muscle power. Finally, differences in muscle performance between obese and nonobese individuals could also be mediated by muscle length specificities, and thus by the joint angle at which strength measurements were made.…”

Section: Impact Of Obesity On Muscle Strengthmentioning

confidence: 99%

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The Impact of Obesity on In Vivo Human Skeletal Muscle Function

et al. 2013

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Despite the considerable efforts that have been made to characterize in vivo human skeletal muscle function in the last 20 years, there is still controversy about whether obesity affects muscle performance in people of different ages. We therefore reviewed the available literature to determine the impact of obesity on skeletal muscle strength and fatigue. Obese individuals have (i) higher absolute muscle strength, (ii) lower strength per unit body mass, (iii) a similar strength to total fat-free mass ratio and (iv) a similar/higher strength to muscle size ratio compared to their nonobese peers. These results suggest that obesity does not negatively affect the intrinsic muscle contractile properties. Moreover, the available evidence does not show differences in muscle fatigue between obese and nonobese individuals. Therefore, factors such as the handicapping effect of excess fat mass and/or impaired motor coordination may account for the poor physical performance of obese people of all ages.

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Section: Impact Of Obesity On Muscle Strengthmentioning

confidence: 99%

Section: Impact Of Obesity On Muscle Strengthmentioning

confidence: 99%

The Impact of Obesity on In Vivo Human Skeletal Muscle Function

et al. 2013

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“…In this position the metatarsal-phalangeal joint of the right barefoot was aligned with the edge of one wooden block and the calcaneus was supported by another wooden block. Data were only collected from the right ankle, as muscle stiffness does not vary between the dominant and nondominant limbs (Faria et al, 2009a. The right foot was also the preferred foot for all of the participants.…”

Section: Maximal Voluntary Isometric Contraction Measurementmentioning

confidence: 99%

“…The oscillations produced at the ankle-foot (plantarflexion/dorsiflexion) were registered and used to assess the musculo-articular stiffness. Participants were prevented from seeing the application of the impulse and were instructed not to react to any stimulus (Faria et al, 2009a, Faria et al, 2010, Hunter and Spriggs, 2000. The impulses were applied randomly to prevent participants from anticipating the impulses.…”

Section: Free Oscillation Data Measurementmentioning

confidence: 99%

“…Although the goal of the present study was not to determine the relationship between the mechanical properties of the triceps surae and the risk of injury, an understanding of these properties may also provide some insight for injury prevention in football because excessive or insufficient stiffness levels have been related to the risk of bone and soft tissue injuries, respectively (Faria et al, 2009a, Butler et al, 2003. Moreover, as damping can be related to energy absorption, an increase in damping characteristics (i.e., damping coefficient and damping ratio) may indicate an increased ability to absorb energy and minimize the risk of injuries (Hunter et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of the triceps surae: Differences between football and non-football players

Faria

Gabriel

Abrantes

et al. 2013

Journal of Sports Sciences

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We investigated the mechanical properties of the triceps surae between professional, junior, and nonfootball players. Fifty-nine men participated in this study. The mechanical properties of the right legs' triceps surae were measured in vivo using a free oscillation technique; no significant differences existed between the groups. The mean results for musculo-articular stiffness, damping coefficient, and damping ratio were as follows: professional football players (21523 N.m Thus, football training, football games, and the position played had no effect on triceps surae mechanical properties. These results may be attributed to opposing adaptations between different types of training that are usually implemented in football. Alternatively, the minimum strain amplitude and/or frequency threshold of the triceps surae required to trigger adaptations of mechanical properties might not be achieved by football players with football training and matches.3

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Repeatability of Dixon magnetic resonance imaging and magnetic resonance spectroscopy for quantitative muscle fat assessments in the thigh

Grimm

Meyer

Nickel

et al. 2018

J cachexia sarcopenia muscle

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BackgroundChanges in muscle fat composition as for example observed in sarcopenia or muscular dystrophy affect physical performance and muscular function, like strength and power. The purpose of the present study is to measure the repeatability of Dixon magnetic resonance imaging (MRI) for assessing muscle volume and fat in the thigh. Furthermore, repeatability of magnetic resonance spectroscopy (MRS) for assessing muscle fat is determined.MethodsA prototype 6‐point Dixon MRI method was used to measure muscle volume and muscle proton density fat fraction (PDFF) in the left thigh. PDFF was measured in musculus semitendinosus of the left thigh with a T2‐corrected multi‐echo MRS method. For the determination of short‐term repeatability (consecutive examinations), the root mean square coefficients of variation of Dixon MRI and MRS data of 23 young and healthy (29 ± 5 years) and 24 elderly men with sarcopenia (78 ± 5 years) were calculated. For the estimation of the long‐term repeatability (13 weeks between examinations), the root mean square coefficients of variation of MRI data of seven young and healthy (31 ± 7 years) and 23 elderly sarcopenic men (76 ± 5 years) were calculated. Long‐term repeatability of MRS was not determined.ResultsShort‐term errors of Dixon MRI volume measurement were between 1.2% and 1.5%, between 2.1% and 1.6% for Dixon MRI PDFF measurement, and between 9.0% and 15.3% for MRS. Because of the high short‐term repeatability errors of MRS, long‐term errors were not determined. Long‐term errors of MRI volume measurement were between 1.9% and 4.0% and of Dixon MRI PDFF measurement between 2.1% and 4.2%.ConclusionsThe high degree of repeatability of volume and PDFF Dixon MRI supports its use to predict future mobility impairment and measures the success of therapeutic interventions, for example, in sarcopenia in aging populations and muscular dystrophy. Because of possible inhomogeneity of fat infiltration in muscle tissue, the application of MRS for PDFF measurements in muscle is more problematic because this may result in high repeatability errors. In addition, the tissue composition within the MRS voxel may not be representative for the whole muscle.

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Triceps-surae musculotendinous stiffness: Relative differences between obese and non-obese postmenopausal women

Cited by 38 publications

References 32 publications

The Impact of Obesity on In Vivo Human Skeletal Muscle Function

The Impact of Obesity on In Vivo Human Skeletal Muscle Function

Mechanical properties of the triceps surae: Differences between football and non-football players

Repeatability of Dixon magnetic resonance imaging and magnetic resonance spectroscopy for quantitative muscle fat assessments in the thigh

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