The influence on sarcopenia of muscle quality and quantity derived from magnetic resonance imaging and neuromuscular properties

Power, Geoffrey A.; Allen, Matti D.; Booth, William J.; Thompson, Robert T.; Marsh, Greg D.; Rice, Charles L.

doi:10.1007/s11357-014-9642-3

Cited by 46 publications

(52 citation statements)

References 46 publications

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“…Additionally, normalized contractile properties were 60-98 % slower in the old than young, which was accompanied by 16-20 % lower peak angular velocities at isotonic resistances <40 % MVC. The age-related slowing in contractile function is in agreement with previous reports in this (Roos et al 1999;Petrella et al 2005;Dalton et al 2012;Thompson et al 2014) and other muscle groups (Valour et al 2003;McNeil and Rice 2007;Dalton et al 2010aDalton et al , b, 2014Power et al 2014). Consequently, the slower and weaker knee extensors resulted in a~56 % lower maximal power capacity in the older men than young, which was accompanied by a shift in maximum power achievement to slower absolute velocities and higher relative torques for the isokinetic and isotonic tasks, respectively.…”

Section: Baselinesupporting

confidence: 91%

Older men are more fatigable than young when matched for maximal power and knee extension angular velocity is unconstrained

Dalton

Power

Paturel

et al. 2015

AGE

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The underlying factors related to the divergent findings of age-related fatigue for dynamic tasks are not well understood. The purpose here was to investigate age-related fatigability and recovery between a repeated constrained (isokinetic) and an unconstrained velocity (isotonic) task, in which participants performed fatiguing contractions at the velocity (isokinetic) or resistance (isotonic) corresponding with maximal power. To compare between tasks, isotonic torque-power relationships were constructed prior to and following both fatiguing tasks and during short-term recovery. Contractile properties were recorded from 9 old (~75 years) and 11 young (~25 years) men during three testing sessions. In the first session, maximal power was assessed, and sessions 2 and 3 involved an isokinetic or an isotonic concentric fatigue task performed until maximal power was reduced by 40 %. Compared with young, the older men performed the same number of contractions to task failure for the isokinetic task (~45 contractions), but 20 % fewer for the isotonic task (p<0.05). Regardless of age and task, maximal voluntary isometric contraction strength, angular velocity, and power were reduced by~30,~13, and~25 %, respectively, immediately following task failure, and only isometric torque was not recovered fully by 10 min. In conclusion, older men are more fatigable than the young when performing a repetitive maximal dynamic task at a relative resistance (isotonic) but not an absolute velocity (isokinetic), corresponding to maximal power.

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Section: Baselinesupporting

confidence: 91%

Older men are more fatigable than young when matched for maximal power and knee extension angular velocity is unconstrained

Dalton

Power

Paturel

et al. 2015

AGE

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“…Our results showed higher MIVC values in the Old group compared with the Older group. Differently from our results, Power et al 24 did not found significantly difference in MIVC of dorsiflexor muscles between, men aged from 60 to 73 years (39.8±6.5 N.m), and older men aged between 76 and 85 years (40.9±6.4 N.m) 24 . The different gender and muscle group assessed may have contributed to these discrepant results.…”

Section: Discussioncontrasting

confidence: 99%

Qualidade muscular, mas não espessura, é reduzida em diferentes grupos etários em idosas ativas

López

Radaelli

Rech

et al. 2015

Rev. Bras. Cineantropom. Desempenho Hum.

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-The aim of this study was to compare the muscle thickness (MT), muscle quality (MQ), and functionality of two different age groups of active elderly women. Twenty seven older women (between 60 and 80 years old), physically active was dividing in two age groups: old 60-66 years (Old) and old 73-80 years (Older) volunteered for the present study. Knee extension isometric peak torque (PT) was obtained during a muscle isometric voluntary contraction (MIVC), and the value was normalized by MT. The Quadriceps Echo Intensity (QEI) was defined as the mean Echo Intensity (EI) value founded in all quadriceps muscle portions in ultrasound imaging. Was found MIVC increased (p=0.024) in the O1 (120.26±24.77 N/m) group when compared with the O2 (99.25±20.95 N/m) group, but when the MIVC was normalized the difference did not exist between groups (p≥0.05). The QEI was found increased in the Older group (97.10±17.35 a.u.) when compared with the Old group (80.18±14.95 a.u.) (p<0.05). Contrary to that, the QMT did not differ significantly between the groups (p≥0.05). The Old group presented a significant higher number of repetitions in the 30SS (14.13±2.29 repetitions) when compared to Older group (11.25±1.95 repetitions) (p<0.05). We observed that even without significantly greater muscle size, the Old group presented the results of 30SS significantly greater when compared with the older group. Besides that, the QEI was found increased in the older group and suggests that EI may be the best predictor of functional capacity than muscle quantity in active older woman. Key words: Aged; Aging; Musculoskeletal system; Ultrasonography. PT (120,3±24,8 N.m) comparado ao grupo Older (99,2±20,9 N.m) (p<0,05), entretanto os valores relativizados por espessura muscular não apresentaram diferenças entre grupos (p≥0,05). A EIQ foi maior no grupo Old (97,1±17,3 u.a.) quando comparado ao grupo Older (80,2±14,9 u.a.) (p<0,05). Não houve diferença significante na EMQ entre os grupos (p≥0,05). O grupo Old realizou um número maior de repetições no teste (14,1±2,3 repetições) comparado ao grupo Older (11,2±1,9 repetições) (p<0,05 Resumo -Comparar a espessura muscular (EM), qualidade muscular (QM), e a funcionalidade entre dois grupos de mulheres idosas. Vinte e sete mulheres idosas (entre 60 e 80 anos) fisicamente ativas foram divididas em dois grupos: Grupo Old (n=15, 60-66 anos) e grupo Older (n=12, 73-80 anos). O pico de torque (PT) isométrico dos extensores de joelho foi obtido por contração isométrica voluntária máxima (CIVM), e seu valor foi normalizado pela EM. A espessura muscular do quadríceps femoral (EMQ) foi definida como o somatório da espessura muscular de todas as porções do quadríceps, e a qualidade muscular foi estimada pela média da Eco Intensidade do quadríceps femoral (EIQ). O grupo Old apresentou maiores valores absolutos de

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“…These studies largely report discrepant findings, but a critical examination indicates several notable observations. First, many older people, particularly those who are healthy and physically active, do not exhibit impairments in voluntary activation . Second, weaker older people, as well as the oldest old, do exhibit impairments in voluntary activation .…”

Section: Physiological Systems That Contribute To the Decline In Eldementioning

confidence: 99%

Skeletal muscle performance and ageing

Tieland

Trouwborst

Clark

2017

J cachexia sarcopenia muscle

547

429

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The world population is ageing rapidly. As society ages, the incidence of physical limitations is dramatically increasing, which reduces the quality of life and increases healthcare expenditures. In western society, ~30% of the population over 55 years is confronted with moderate or severe physical limitations. These physical limitations increase the risk of falls, institutionalization, co‐morbidity, and premature death. An important cause of physical limitations is the age‐related loss of skeletal muscle mass, also referred to as sarcopenia. Emerging evidence, however, clearly shows that the decline in skeletal muscle mass is not the sole contributor to the decline in physical performance. For instance, the loss of muscle strength is also a strong contributor to reduced physical performance in the elderly. In addition, there is ample data to suggest that motor coordination, excitation–contraction coupling, skeletal integrity, and other factors related to the nervous, muscular, and skeletal systems are critically important for physical performance in the elderly. To better understand the loss of skeletal muscle performance with ageing, we aim to provide a broad overview on the underlying mechanisms associated with elderly skeletal muscle performance. We start with a system level discussion and continue with a discussion on the influence of lifestyle, biological, and psychosocial factors on elderly skeletal muscle performance. Developing a broad understanding of the many factors affecting elderly skeletal muscle performance has major implications for scientists, clinicians, and health professionals who are developing therapeutic interventions aiming to enhance muscle function and/or prevent mobility and physical limitations and, as such, support healthy ageing.

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The influence on sarcopenia of muscle quality and quantity derived from magnetic resonance imaging and neuromuscular properties

Cited by 46 publications

References 46 publications

Older men are more fatigable than young when matched for maximal power and knee extension angular velocity is unconstrained

Older men are more fatigable than young when matched for maximal power and knee extension angular velocity is unconstrained

Qualidade muscular, mas não espessura, é reduzida em diferentes grupos etários em idosas ativas

Skeletal muscle performance and ageing

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