Musculoskeletal modeling and simulation of three various Sit-to-Stand strategies: An evaluation of the biomechanical effects of the chair-rise strategy modification

2014 ◽  
Vol 22 (4) ◽  
pp. 627-644 ◽  
Author(s):  
Soheil Bajelan ◽  
Mahmood Reza Azghani
Keyword(s):  
Modeling And Simulation ◽  
Musculoskeletal Modeling ◽  
Sit To Stand ◽  
Chair Rise

The Relationship Between Different Body Mass Index Categories and Chair Rise Performance in Adult Women

2013 ◽  
Vol 29 (6) ◽  
pp. 705-711 ◽  
Author(s):  
Stefan Schmid ◽  
Stéphane Armand ◽  
Zoltan Pataky ◽  
Alain Golay ◽  
Lara Allet
Keyword(s):  
Adult Women ◽  
Life Activity ◽  
Obese People ◽  
Stand Test ◽  
Sit To Stand ◽  
Severely Obese ◽  
Obese Subjects ◽  
Chair Rise ◽  
The Relationship ◽  
Overweight Subjects

An important prerequisite to carry out daily activities is the sit-to-stand movement. However, in obese people, this movement is characterized by altered biomechanics, which might lead to daily life activity impairments. The aim of this study was to investigate whether there are differences in kinetic and kinematic variables between three different BMI categories when performing a specific sit-to-stand test. Thirty-six adult women (BMI = 17–45 kg/m2) performed the sit-to stand test five times consecutively and as quickly as possible. Analyses of variance were used to determine differences between three BMI groups (normal or overweight: BMI < 30 kg/m2; obese: 30 ≤ BMI < 35; severely obese: BMI ≥ 35). Peak and mean vertical sacrum velocity indicated a decrease in severely obese subjects. Obese and severely obese individuals did not show higher fatigue over the five consecutive movements. Peak force and rate of force development decreased in normal or overweight subjects. The ability to successfully complete the test decreased with a higher BMI, probably due to a reduced ability to rapidly generate a high force.

Modeling and simulation for support robot tracking a human sit to stand motion

2016 ◽  
Author(s):  
Omar Salah ◽  
Salvatore Sessa ◽  
Ahmed M. R. Fath El-Bab ◽  
Yo Kobayashi ◽  
Atsuo Takanishi ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Sit To Stand ◽  
Robot Tracking

scholarly journals OpenSim: a musculoskeletal modeling and simulation framework for in silico investigations and exchange

2011 ◽  
Vol 2 ◽  
pp. 212-232 ◽  
Author(s):  
Ajay Seth ◽  
Michael Sherman ◽  
Jeffrey A. Reinbolt ◽  
Scott L. Delp
Keyword(s):  
Modeling And Simulation ◽  
In Silico ◽  
Musculoskeletal Modeling ◽  
Simulation Framework

SENSITIVITY OF MODEL-PREDICTED MUSCLE FORCES OF PATIENTS WITH CEREBRAL PALSY TO VARIATIONS IN MUSCLE-TENDON PARAMETERS

2021 ◽  
Vol 21 (01) ◽  
pp. 2150008
Author(s):  
YUNUS ZIYA ARSLAN ◽  
DERYA KARABULUT
Keyword(s):  
Cerebral Palsy ◽  
Modeling And Simulation ◽  
Muscle Fiber ◽  
Fiber Length ◽  
Muscle Force ◽  
Musculoskeletal Modeling ◽  
Healthy Children ◽  
Muscle Forces ◽  
Healthy Individuals ◽  
Slack Length

Computational musculoskeletal modeling and simulation platforms are efficient tools to gain insight into the muscular coordination of patients with motor disabilities such as cerebral palsy (CP). Muscle force predictions from simulation programs are influenced by the architectural and contractile properties of muscle-tendon units. In this study, we aimed to evaluate the sensitivity of major lower limb muscle forces in patients with CP to changes in muscle-tendon parameters. Open-access datasets of children with CP ([Formula: see text]) and healthy children ([Formula: see text]) were considered. Monte Carlo analysis was executed to specify how sensitive the muscle forces to perturbations between [Formula: see text]% and [Formula: see text]% of the nominal value of the maximum isometric muscle force, optimal muscle fiber length, muscle pennation angle, tendon slack length, and maximum contraction velocity of muscle. The sensitivity analysis revealed that muscle forces of CP patients and healthy individuals were most sensitive to perturbations in the tendon slack length ([Formula: see text]), while forces of CP patients were more sensitive to tendon slack length when compared to the healthy group ([Formula: see text]). Muscle forces of patients and healthy individuals were insensitive to the other four parameters ([Formula: see text]), except for the gracilis and sartorius muscles in which the proportion of optimal muscle fiber length to tendon slack length is higher than 1; forces of these two muscles were also sensitive to the optimal muscle fiber length. The results of this study are expected to contribute to our understanding of which parameters should be personalized when conducting musculoskeletal modeling and simulation of patients with CP.

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