Neural and Muscular Contributions to the Age-Related Reductions in Rapid Strength

Gerstner, Gena R.; Thompson, Brennan J.; Rosenberg, Joseph G.; Sobolewski, Eric J.; Scharville, Michael J.; Ryan, Eric D.

doi:10.1249/mss.0000000000001231

Cited by 57 publications

(96 citation statements)

References 40 publications

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“…Additionally, the ability to recruit and activate motor units is also a known impairment in children and adolescents with spastic CP . Exploring if higher echo‐intensity values are related to reduced isometric force‐generation and rate of force‐generation, as seen in sarcopenia populations, would also provide another clinical meaning to higher echo‐intensity values in individuals with spastic CP.…”

Section: Discussionmentioning

confidence: 99%

Medial gastrocnemius volume and echo‐intensity after botulinum neurotoxin A interventions in children with spastic cerebral palsy

Schless

Cenni

Bar‐On

et al. 2018

Develop Med Child Neuro

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first publication: reference 24 has been added and the ethical commission number has been corrected.] AIM This cross-sectional investigation evaluated whether recurrent botulinum neurotoxin A (BoNT-A) interventions to the medial gastrocnemius have an influence on muscle morphology, beyond Gross Motor Function Classification System (GMFCS) level.METHOD A cohort of typically developing children (n=67; 43 males, 24 females; median age 9y 11mo [range 7y 10mo-11y 6mo]), a cohort of children with spastic cerebral palsy (CP) naive to BoNT-A interventions (No-BoNT-A; n=19; 10 males, nine females; median age 9y 3mo [range 8y 5mo-10y 10mo]) and a cohort of children with spastic CP with a minimum of three recurrent BoNT-A interventions to the medial gastrocnemius (BoNT-A; n=19; 13 males, six females; median age 9y 8mo [range 7y 3mo-10y 7mo]) were recruited. Three-dimensional freehand ultrasound was used to estimate medial gastrocnemius volume normalized to body mass and echo-intensity.

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Section: Discussionmentioning

confidence: 99%

Medial gastrocnemius volume and echo‐intensity after botulinum neurotoxin A interventions in children with spastic cerebral palsy

Schless

Cenni

Bar‐On

et al. 2018

Develop Med Child Neuro

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“…ageing) (Gerstner et al . ) than maximal muscle force. Although previous studies have suggested that muscle activation is one of the key determinants of rapid force production, investigations into specific motor unit properties and their relationship to rapid strength are sparse.…”

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confidence: 90%

“…100–200 ms) (Gerstner et al . ). The later phase is thought to be more related to maximal strength, and thus muscle‐specific factors (i.e.…”

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confidence: 97%

Motor unit properties of rapid force development during explosive contractions

Mota

Gerstner

Giuliani

2019

The Journal of Physiology

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“…Typically, rapid torque measures are examined at different time intervals of a muscle contraction such as the early (i.e., 0-50 ms) and late phase (i.e., 100-200 ms) [6,12]. Early rapid torque variables are associated with initial motor unit recruitment and firing rates [5,13], as well as intrinsic muscle properties (i.e., fiber type composition, calcium kinetics) [14,15], while maximal strength and muscle size become more influential for late rapid torque measures [14,16].…”

Section: Introductionmentioning

confidence: 99%

Early and late rapid torque characteristics and select physiological correlates in middle-aged and older males

Olmos

Stratton

et al. 2020

PLoS ONE

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The purpose of this study was to compare early and late rapid torque parameters of the plantar flexors (PFs) in middle-aged (MM) and older (OM) males, and determine the effect of normalization to peak torque (PT) and muscle cross-sectional area (CSA). Methods Twenty-nine healthy, MM (n = 14; 45 ± 2 yrs) and OM (n = 15; 65 ± 3 yrs) performed rapid, maximal isometric contractions of the PFs. PT, as well as rate of torque development and impulse during the early (0-50 ms; RTD 0-50 , IMP 0-50) and late (100-200 ms; RTD 100-200 , IMP 100-200) contraction phases were calculated. Torque at 50 (TQ 50), 100 (TQ 100), and 200 (TQ 200) ms was also obtained. CSA and echo-intensity (EI) of the gastrocnemii were acquired via ultrasonography. Torque variables were normalized to PT and CSA. Rate of EMG rise (RER) for the medial gastrocnemius was calculated at 30, 50 and 75 ms.

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Neural and Muscular Contributions to the Age-Related Reductions in Rapid Strength

Cited by 57 publications

References 40 publications

Medial gastrocnemius volume and echo‐intensity after botulinum neurotoxin A interventions in children with spastic cerebral palsy

Medial gastrocnemius volume and echo‐intensity after botulinum neurotoxin A interventions in children with spastic cerebral palsy

Motor unit properties of rapid force development during explosive contractions

Early and late rapid torque characteristics and select physiological correlates in middle-aged and older males

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