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Rakshit R, Xiang Y, Yang J. Functional muscle group- and sex-specific parameters for a three-compartment controller muscle fatigue model applied to isometric contractions. J Biomech 2021; 127:110695. [PMID: 34454329 DOI: 10.1016/j.jbiomech.2021.110695] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 08/10/2021] [Accepted: 08/12/2021] [Indexed: 02/06/2023]
Abstract
The three-compartment controller with enhanced recovery (3CC-r) model of muscle fatigue has previously been validated separately for both sustained (SIC) and intermittent isometric contractions (IIC) using different objective functions, but its performance has not yet been tested against both contraction types simultaneously using a common objective function. Additionally, prior validation has been performed using common parameters at the joint level, whereas applications to many real-world tasks will require the model to be applied to agonistic and synergistic muscle groups. Lastly, parameters for the model have previously been derived for a mixed-sex cohort not considering the differece in fatigabilities between the sexes. In this work we validate the 3CC-r model using a comprehensive isometric contraction database drawn from 172 publications segregated by functional muscle group (FMG) and sex. We find that prediction errors are reduced by 19% on average when segregating the dataset by FMG alone, and by 34% when segregating by both sex and FMG. However, minimum prediction errors are found to be higher when validated against both SIC and IIC data together using torque decline as the outcome variable than when validated sequentially against hypothesized SIC intensity-endurance time curves with endurance time as the outcome variable and against raw IIC data with torque decline as the outcome variable.
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Affiliation(s)
- Ritwik Rakshit
- Human-Centric Design Research Lab, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, USA
| | - Yujiang Xiang
- School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078, USA
| | - James Yang
- Human-Centric Design Research Lab, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
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Shelley S, James RS, Eustace S, Eyre E, Tallis J. The effects of high adiposity on concentric and eccentric muscle performance of upper and lower limb musculature in young and older adults. Appl Physiol Nutr Metab 2021; 46:1047-1057. [PMID: 33656946 DOI: 10.1139/apnm-2020-0945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The present study uniquely examined the influence of old age and adiposity on maximal concentric and eccentric torque and fatigue of the elbow and knee (KF, KE) flexors and extensors. Forty males were recruited and categorised into young (n = 21, 23.7 ± 3.4) and old (n = 19, 68.3 ± 6.1) and then further into normal (young = 16.9 ± 2.5%, old = 20.6 ± 3.1%) and high adiposity (young = 28.9 ± 5.0%, old = 31.3 ± 4.2%) groups. Handgrip strength, sit-to-stand performance, and isokinetic assessments of peak torque at 60°, 120° and 180°·s-1 were measured. Older men produced significantly less concentric and eccentric peak torque (P < 0.016) but this was not influenced by adiposity (P > 0.055). For KE and KF, high adiposity groups demonstrated reduced peak torque normalised to body mass (P < 0.021), and muscle and contractile mode specific reduction in torque normalised to segmental lean mass. Eccentric fatigue resistance was unaffected by both age and adiposity (P > 0.30) and perceived muscle soreness, measured up to 72 hours after, was only enhanced in the upper body of the young group following eccentric fatigue (P = 0.009). Despite the impact of adiposity on skeletal muscle function being comparable between ages, these results suggest high adiposity will have greater impact on functional performance of older adults. Novelty: Irrespective of age, high adiposity may negatively impact force to body mass ratio and muscle quality in a muscle and contractile mode specific manner. Whilst the magnitude of adiposity effects is similar across ages, the impact for older adults will be more substantial given the age-related decline in muscle function.
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Affiliation(s)
- Sharn Shelley
- Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK.,Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK
| | - Rob S James
- Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK.,Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK
| | - Steven Eustace
- Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK.,Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK
| | - Emma Eyre
- Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK.,Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK
| | - Jason Tallis
- Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK.,Centre for Sport, Exercise and Life Sciences, Faculty of Health & Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK
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Rakshit R, Yang J. Modelling muscle recovery from a fatigued state in isometric contractions for the ankle joint. J Biomech 2020; 100:109601. [PMID: 31952819 DOI: 10.1016/j.jbiomech.2020.109601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 12/03/2019] [Accepted: 12/31/2019] [Indexed: 11/26/2022]
Abstract
Current models of localized muscular fatigue are capable of predicting performance in isometric tasks with reasonable accuracy. However, they do not account for the effect of continuously-varying task intensities on muscular recovery from a fatigued state. In this work, we propose and evaluate three continuous functions for modelling recovery to replace a dichotomous step-function in the three-compartment controller (3CC-r) model of muscle fatigue (Looft et al., 2018) and validate their predictions with previously collected data in the literature for intermittent and sustained isometric tasks of the ankle joint performed at different intensities. When compared to experimental data the accuracy of one of the three proposed models of recovery is found to be nearly the same as that yielded by the original step-function, but this seemingly-identical accuracy may be a limitation of the dataset used. A superelliptical curve relating recovery factor to task intensity is proposed to be the closest replacement for the step function as it depicts both the elevated value of recovery factor for near-rest activities as well as a nearly-constant value for low-to-high-intensity tasks.
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Affiliation(s)
- Ritwik Rakshit
- Human-Centric Design Research Laboratory, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, USA
| | - James Yang
- Human-Centric Design Research Laboratory, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
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