Reductions in motor unit firing are associated with clinically meaningful leg extensor weakness in older adults

NP Wages, MH Mousa, LA Clark, D Tavoian… - Calcified Tissue …, 2024 - Springer
Weakness, one of the key characteristics of sarcopenia, is a significant risk factor for
functional limitations and disability in older adults. It has long been suspected that …

Motor unit firing patterns in older adults with low skeletal muscle mass

T Hirono, R Takeda, T Nishikawa, M Okudaira… - Archives of Gerontology …, 2024 - Elsevier
Muscular dysfunctions involving a decline in muscle strength are often induced by loss of
muscle mass in older adults. Understanding neural activation in older adults in addition to …

Muscle strength, not age, explains unique variance in echo intensity

AU Bali, KK Harmon, AM Burton, DC Phan… - Experimental …, 2020 - Elsevier
Echo intensity (EI) is being increasingly utilized by investigators as an index of skeletal
muscle quality. Previous studies have reported independent associations between EI versus …

Intrinsic motoneuron excitability is reduced in soleus and tibialis anterior of older adults

LBR Orssatto, DN Borg, AJ Blazevich, RL Sakugawa… - Geroscience, 2021 - Springer
Age-related deterioration within both motoneuron and monoaminergic systems should
theoretically reduce neuromodulation by weakening motoneuronal persistent inward current …

The relationship between single muscle fibre and voluntary rate of force development in young and old males

BE Dalton, N Mazara, MIB Debenham… - European Journal of …, 2023 - Springer
Purpose It is suggested that the early phase (< 50 ms) of force development during a muscle
contraction is associated with intrinsic contractile properties, while the late phase (> 50 ms) …

Effects of voluntary contraction on the soleus H-reflex of different amplitudes in healthy young adults and in the elderly

L Batista-Ferreira, NF Rabelo, GM Cruz… - Frontiers in human …, 2022 - frontiersin.org
A number of H-reflex studies used a moderate steady voluntary contraction in an attempt to
keep the motoneuron pool excitability relatively constant. However, it is not clear whether the …

[PDF][PDF] The Decomposition Method of Surface Electromyographic Signals: A Novel Approach for Motor Unit Activity and Recruitment Description

P ŠÁDEK, J OTÁHAL - Physiological research, 2024 - biomed.cas.cz
This review aims to describe a novel method in the field of electromyography (EMG),
established and improved upon in the last three decades that is able to observe specific …

The acute effects of action observation on muscle strength/weakness and corticospinal excitability in older adults

KK Harmon, RM Girts, JI Pagan, G Rodriguez… - Experimental Brain …, 2022 - Springer
Muscle weakness is a critical problem facing many older adults. Interventions targeting
nervous system plasticity may show promise in enhancing strength. The purpose of this …

An exploration of the motor unit behaviour during the concentric and eccentric phases of a squat task performed at different speeds

E Orantes-Gonzalez, J Heredia-Jimenez… - Sports …, 2023 - Taylor & Francis
Despite squatting being important in strength training and rehabilitation, few studies have
investigated motor unit (MU) behaviour. This study explored the MU behaviour of vastus …

[HTML][HTML] Neural Drive and Motor Unit Characteristics of the Serratus Anterior in Individuals With Scapular Dyskinesis

M Kuniki, Y Iwamoto, R Konishi… - … of Musculoskeletal & …, 2024 - ncbi.nlm.nih.gov
Objective: Scapular dyskinesis is one of the causes of shoulder disorders and involves
muscle weakness in the serratus anterior. This study investigated whether motor unit (MU) …