How we get a grip: Microstructural neural correlates of manual grip strength in children

Area of Science:

• Neuroscience
• Developmental Biology
• Biomedical Imaging

Background:

• Maximal grip strength correlates with health outcomes, reflecting brain-body communication efficiency.
• Primate models link grip strength to the cortical lateral grasping network, but human pediatric data is scarce.
• The role of proprioceptive and cerebellar networks in grip strength remains unclear in children.

Purpose of the Study:

• To investigate the association between white matter microstructure in specific brain networks and grip strength in children.
• To explore the translatability of non-human primate grip strength models to human pediatric populations.
• To examine the neurobiological underpinnings of grip strength in relation to sensory and motor pathways.

Main Methods:

• Utilized high-resolution, multi-shell diffusion and quantitative T1 imaging in 70 children.
• Assessed white matter microstructure in the lateral grasping, proprioception input, and cortico-cerebellar modification networks.
• Correlated imaging metrics (fractional anisotropy, R1) with maximal grip strength measurements.

Main Results:

• Stronger grip strength positively correlated with higher fractional anisotropy and R1 in the lateral grasping and proprioception input networks.
• These findings suggest increased microstructural coherence and myelination in cortical sensory and motor pathways.
• No significant relationships were observed within the cerebellar modification network.

Conclusions:

• Increased myelination of cortical sensory and motor pathways is neurobiologically linked to stronger grip strength in children.
• This mechanism may represent a broader signature of pediatric neuro-motor development.
• Grip strength serves as a potential indicator of foundational brain-body communication efficiency in pediatric populations.