PMID- 38470378
OWN - NLM
STAT- MEDLINE
DCOM- 20240409
LR  - 20240409
IS  - 1528-8951 (Electronic)
IS  - 0148-0731 (Linking)
VI  - 146
IP  - 8
DP  - 2024 Aug 1
TI  - General Muscle Torque Generator Model for a Two Degree-of-Freedom Shoulder Joint.
LID - 081008 [pii]
LID - 10.1115/1.4065044 [doi]
AB  - Muscle torque generators (MTGs) have been developed as an alternative to 
      muscle-force models, reducing the muscle-force model complexity to a single 
      torque at the joint. Current MTGs can only be applied to single Degree-of-freedom 
      (DoF) joints, leading to complications in modeling joints with multiple-DoFs such 
      as the shoulder. This study aimed to develop an MTG model that accounts for the 
      coupling between 2-DoF at the shoulder joint: shoulder plane of elevation 
      (horizontal abduction/adduction) and shoulder elevation (flexion/extension). 
      Three different 2-DoF MTG equations were developed to model the coupling between 
      these two movements. Net joint torques at the shoulder were determined for 20 
      participants (10 females and 10 males) in isometric, isokinetic, and passive 
      tests. Curve and surface polynomial fitting were used to find the best general 
      fit for the experimental data in terms of the different degrees of coupling. The 
      models were validated against experimental isokinetic torque data. It was 
      determined that implicit coupling that used interpolation between single-DoF MTGs 
      resulted in the lowest root-mean-square percent error of 8.5%. The work 
      demonstrated that general MTG models can predict torque results that are 
      dependent on multiple-DoFs of the shoulder.
CI  - Copyright (c) 2024 by ASME.
FAU - Bell, Sydney
AU  - Bell S
AUID- ORCID: 0000-0002-9536-9497
AD  - Systems Design Engineering Department, University of Waterloo, Waterloo, ON N2L 
      3G1, Canada.
AD  - University of Waterloo. ROR: https://ror.org/01aff2v68
FAU - Nasr, Ali
AU  - Nasr A
AUID- ORCID: 0000-0003-4001-0361
AD  - Systems Design Engineering Department, University of Waterloo, Waterloo, ON N2L 
      3G1, Canada.
FAU - McPhee, John
AU  - McPhee J
AD  - Systems Design Engineering Department, University of Waterloo, Waterloo, ON N2L 
      3G1, Canada.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Biomech Eng
JT  - Journal of biomechanical engineering
JID - 7909584
SB  - IM
MH  - Male
MH  - Female
MH  - Humans
MH  - *Shoulder Joint/physiology
MH  - Torque
MH  - Shoulder
MH  - Muscles
MH  - Movement/physiology
MH  - Biomechanical Phenomena
OTO - NOTNLM
OT  - muscle mechanics
OT  - muscle torque generator
OT  - shoulder joint
OT  - torque-angle relationship
OT  - torque-velocity relationship
EDAT- 2024/03/12 12:43
MHDA- 2024/04/09 06:45
CRDT- 2024/03/12 11:04
PHST- 2023/08/23 00:00 [received]
PHST- 2024/04/09 06:45 [medline]
PHST- 2024/03/12 12:43 [pubmed]
PHST- 2024/03/12 11:04 [entrez]
AID - 1198606 [pii]
AID - 10.1115/1.4065044 [doi]
PST - ppublish
SO  - J Biomech Eng. 2024 Aug 1;146(8):081008. doi: 10.1115/1.4065044.