Decay of force transients following active stretch is slower in older than young men: Support for a structural mechanism contributing to residual force enhancement in old age

Power, Geoffrey A.; Rice, Charles L.

doi:10.1016/j.jbiomech.2014.08.026

Cited by 14 publications

(6 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the past several decades, numerous studies have investigated the question of ‘does voluntary activation become impaired with advancing age?’ . These studies largely report discrepant findings, but a critical examination indicates several notable observations.…”

Section: Physiological Systems That Contribute To the Decline In Eldementioning

confidence: 98%

Skeletal muscle performance and ageing

Tieland

Trouwborst

Clark

2017

J cachexia sarcopenia muscle

624

429

View full text Add to dashboard Cite

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.

show abstract

Section: Physiological Systems That Contribute To the Decline In Eldementioning

confidence: 98%

Skeletal muscle performance and ageing

Tieland

Trouwborst

Clark

2017

J cachexia sarcopenia muscle

624

429

View full text Add to dashboard Cite

show abstract

“…Although it was beyond the scope of this study, it seems that a greater contribution of passive force to total force production following active lengthening as compared with the ISO condition is responsible for RFE. 8 , 9 , 10 , 11 It has recently been suggested that the increase in passive force following active lengthening is due to Ca 2+ -dependent stiffening of the giant protein titin. 42 , 43 Consequently, in the RFE state, less active force is required to produce similar force levels to that of the ISO condition, ultimately contributing to the AR observed during torque-matching trials in our study.…”

Section: Discussionmentioning

confidence: 99%

“… 5 , 6 While the mechanisms of RFE are still under debate, 7 it is clear that there is a greater contribution of passive force to overall total force production following active lengthening, as compared with an ISO. 8 , 9 , 10 , 11 Moreover, when matching isometric force (or torque) levels, the greater contribution of passive force in the force-enhanced state results in an activation reduction (AR), which is observed as a reduction in electromyographic activity (EMG) 5 , 12 , 13 and adenosine triphosphate usage. 14 Additionally, during torque- and activation-clamped experiments, the RFE EMG–torque relationship is shifted to the right as compared with ISO, 15 indicating lower activation to achieve a given torque level.…”

Section: Introductionmentioning

confidence: 99%

Activation reduction following an eccentric contraction impairs torque steadiness in the isometric steady-state

Mazara

Hess

Chen

et al. 2018

Journal of Sport and Health Science

Self Cite

View full text Add to dashboard Cite

HighlightsTorque steadiness in the isometric steady-state following an eccentric contraction is impaired compared with a purely isometric contraction.This decrease in torque steadiness is driven by an activation reduction that occurs in the isometric steady-state following an eccentric contraction when torque is matched to that of a purely isometric contraction.When activation was matched between a purely isometric contraction and the isometric steady-state following an eccentric contraction, there was no difference in torque steadiness.Residual force enhancement may improve neuromuscular economy but negatively affects torque steadiness at low levels of contraction intensity. Altered motor unit activation strategies in the force enhanced state likely contribute to the unsteadiness following active lengthening.

show abstract

“…Specifically, the slower rate of decay may potentially suggest a greater non-active contribution to total RFE (Koppes et al, 2013). Thus, the 'non-active' component of RFE appears to play a larger role in older adults compared with young as indicated by the greater relative reliance on passive force enhancement, a longer time to reach an isometric steady-state, and a slower exponential decline following stretch (Power et al, 2014) (Fig. 1).…”

Section: Normal Adult Agingmentioning

confidence: 99%