In Vivo Imaging of Human Sarcomere Twitch Dynamics in Individual Motor Units.

Abstract:

:Motor units comprise a pre-synaptic motor neuron and multiple post-synaptic muscle fibers. Many movement disorders disrupt motor unit contractile dynamics and the structure of sarcomeres, skeletal muscle's contractile units. Despite the motor unit's centrality to neuromuscular physiology, no extant technology can image sarcomere twitch dynamics in live humans. We created a wearable microscope equipped with a microendoscope for minimally invasive observation of sarcomere lengths and contractile dynamics in any major skeletal muscle. By electrically stimulating twitches via the microendoscope and visualizing the sarcomere displacements, we monitored single motor unit contractions in soleus and vastus lateralis muscles of healthy individuals. Control experiments verified that these evoked twitches involved neuromuscular transmission and faithfully reported muscle force generation. In post-stroke patients with spasticity of the biceps brachii, we found involuntary microscopic contractions and sarcomere length abnormalities. The wearable microscope facilitates exploration of many basic and disease-related neuromuscular phenomena never visualized before in live humans.

journal_name

Neuron

journal_title

Neuron

authors

Sanchez GN,Sinha S,Liske H,Chen X,Nguyen V,Delp SL,Schnitzer MJ

doi

10.1016/j.neuron.2015.11.022

subject

Has Abstract

pub_date

2015-12-16 00:00:00

pages

1109-1120

issue

6

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(15)01028-4

journal_volume

88

pub_type

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