Decoding muscle force from individual motor unit activities using a twitch force model and hybrid neural networks

2022 ◽  
Vol 72 ◽  
pp. 103297
Author(s):  
Xinhui Li ◽  
Xu Zhang ◽  
Xiao Tang ◽  
Maoqi Chen ◽  
Xiang Chen ◽  
...  
APL Materials ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 100903 ◽  
Author(s):  
Mario Miscuglio ◽  
Gina C. Adam ◽  
Duygu Kuzum ◽  
Volker J. Sorger

Author(s):  
Shreeven Kommireddy ◽  
Piyush Raj Pandey ◽  
Raghu Kishore NeeliSetti

2021 ◽  
Vol 40 ◽  
pp. 101115
Author(s):  
Fahim Zaman ◽  
Rakesh Ponnapureddy ◽  
Yi Grace Wang ◽  
Amanda Chang ◽  
Linda M Cadaret ◽  
...  

1991 ◽  
Vol 66 (6) ◽  
pp. 1838-1846 ◽  
Author(s):  
R. K. Powers ◽  
M. D. Binder

1. The tension produced by the combined stimulation of two to four single motor units of the cat tibialis posterior muscle was compared with the algebraic sum of the tensions produced by each individual motor unit. Comparisons were made under isometric conditions and during imposed changes in muscle length. 2. Under isometric conditions, the tension resulting from combined stimulation of units displayed marked nonlinear summation, as previously reported in other cat hindlimb muscles. On average, the measured tension was approximately 20% greater than the algebraic sum of the individual unit tensions. However, small trapezoidal movements imposed on the muscle during stimulation significantly reduced the degree of nonlinear summation both during and after the movement. This effect was seen with imposed movements as small as 50 microns. 3. The degree of nonlinear summation was not dependent on motor unit size or on stimulus frequency. The effect was also unrelated to tendon compliance because the degree of nonlinear summation of motor unit forces was unaffected by the inclusion of different amounts of the external tendon between the muscle and the force transducer. 4. Our results support previous suggestions that the force measured when individual motor units are stimulated under isometric conditions is reduced by friction between the active muscle fibers and adjacent passive fibers. These frictional effects are likely to originate in the connective tissue matrix connecting adjacent muscle fibers. However, because these effects are virtually eliminated by small movements, linear summation of motor unit tensions should occur at low force levels under nonisometric conditions.(ABSTRACT TRUNCATED AT 250 WORDS)


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