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Jokiel M, Kazmierczak K, Czarnecki P, Bartkowiak-Graczyk A, Madziewicz A, Breborowicz E, Miedzyblocka M, Adamski M, Kaczmarek K, Kaczmarek L, Romanowski L. Biomechanical Examination of Wrist Flexors and Extensors with Biodex System Dynamometer-Isometric, Isokinetic and Isotonic Protocol Options. MEDICINA (KAUNAS, LITHUANIA) 2024; 60:1184. [PMID: 39064613 PMCID: PMC11278849 DOI: 10.3390/medicina60071184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2024] [Revised: 07/03/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024]
Abstract
Background and Objectives: Biodex System® is an advanced dynamometer used for testing various biomechanical parameters of muscles. Test outcomes allow for the identification of muscle pathology and consequently lead to a clinical diagnosis. Despite being widely used for the testing and rehabilitation of the human musculoskeletal system, no universal and acceptable protocol for wrist examination has been proposed for patients with wrist pathology. In this study, the authors aim to identify the most appropriate protocol for testing the biomechanical parameters of flexors and extensors of the wrist. Materials and Methods: A group of 20 patients with symptomatic tennis elbow and 26 healthy volunteers were examined using three different protocols: isokinetic, isometric and isotonic. Protocol order for each study participant was assigned at random with a minimum of a 24 h break between protocols. All protocol parameters were set according to data obtained from a literature review and an earlier pilot study. Following completion of each protocol, participants filled out a questionnaire-based protocol, assessing pain intensity during the exam, difficulty with exam performance and post-exam muscle fatigue. Results: The isotonic protocol showed the best patient tolerance and the highest questionnaire score. There was a significant difference (p < 0.05) between the three protocols in average pain intensity reported by study participants. All participants completed the isotonic protocol, but not all patients with symptomatic tennis elbow were able to complete the isometric and isokinetic protocols. The isotonic protocol was deemed "difficult but possible to complete" by study participants. Conclusions: The isotonic protocol is most suitable for testing the flexors and extensors of the wrist. It gives the most biomechanical data of all protocols, is well tolerated by patients and rarely causes pain during examination even in symptomatic participants.
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Affiliation(s)
- Marta Jokiel
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
- Physiotherapy Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Katarzyna Kazmierczak
- Department of Rehabilitation, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Piotr Czarnecki
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Aleksandra Bartkowiak-Graczyk
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
- Physiotherapy Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Anna Madziewicz
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
- Physiotherapy Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Ewa Breborowicz
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Malgorzata Miedzyblocka
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Michal Adamski
- Traumatology, Orthopedics and Hand Surgery Student Scientific Group, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Krystian Kaczmarek
- Traumatology, Orthopedics and Hand Surgery Student Scientific Group, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Leszek Kaczmarek
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
| | - Leszek Romanowski
- Traumatology, Orthopedics and Hand Surgery Department, Poznan University of Medical Sciences, 61-701 Poznan, Poland
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Yoon W, Shin G. Muscle fatigue tracking during dynamic elbow flexion-extension movements with a varying hand load. APPLIED ERGONOMICS 2024; 116:104217. [PMID: 38160628 DOI: 10.1016/j.apergo.2023.104217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 12/16/2023] [Accepted: 12/21/2023] [Indexed: 01/03/2024]
Abstract
Muscle fatigue monitoring, an important element in a fatigue risk management process, can help optimize work intensity and reduce risks for musculoskeletal injuries. An experiment was conducted to determine whether myoelectric manifestations of muscle fatigue can reflect the pace of fatigue development associated with varying load intensity. Twenty male participants performed elbow flexion-extension movements with alternating hand loads (2 kg vs. 1 kg) for 16 min. The pace of fatigue in the biceps brachii in response to load variation was quantified by electromyographic (EMG) fatigue measures collected during the dynamic elbow flexion-extension movements and periodic submaximal isometric elbow flexion trials. The isometric and dynamic EMG measures, except for the amplitude of dynamic EMG, indicated fatigue development during the 2-kg isotonic movements and partial recovery with the 1 kg load. Study results suggest the potential of EMG measures for fatigue monitoring during dynamic work tasks with varying load intensity.
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Affiliation(s)
- Woojin Yoon
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea
| | - Gwanseob Shin
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea.
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Wang M, Zhao C, Barr A, Fan H, Yu S, Kapellusch J, Harris Adamson C. Hand Posture and Force Estimation Using Surface Electromyography and an Artificial Neural Network. HUMAN FACTORS 2023; 65:382-402. [PMID: 34006135 DOI: 10.1177/00187208211016695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
OBJECTIVE The purpose of this study was to develop an approach to predict hand posture (pinch versus grip) and grasp force using forearm surface electromyography (sEMG) and artificial neural networks (ANNs) during tasks that varied repetition rate and duty cycle. BACKGROUND Prior studies have used electromyography with machine learning models to predict grip force but relatively few studies have assessed whether both hand posture and force can be predicted, particularly at varying levels of duty cycle and repetition rate. METHOD Fourteen individuals participated in this experiment. sEMG data for five forearm muscles and force output data were collected. Calibration data (25, 50, 75, 100% of maximum voluntary contraction (MVC)) were used to train ANN models to predict hand posture (pinch versus grip) and force magnitude while performing tasks that varied load, repetition rate, and duty cycle. RESULTS Across all participants, overall hand posture prediction accuracy was 79% (0.79 ± .08), whereas overall hand force prediction accuracy was 73% (0.73 ± .09). Accuracy ranged between 0.65 and 0.93 based on varying repetition rate and duty cycle. CONCLUSION Hand posture and force prediction were possible using sEMG and ANNs, though there were important differences in the accuracy of predictions based on task characteristics including duty cycle and repetition rate. APPLICATION The results of this study could be applied to the development of a dosimeter used for distal upper extremity biomechanical exposure measurement, risk assessment, job (re)design, and return to work programs.
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Affiliation(s)
- Mengcheng Wang
- Northwestern Polytechnical University, Xi'an, China
- University of California, Berkeley, USA
| | | | - Alan Barr
- University of California, San Francisco, USA
| | - Hao Fan
- Northwestern Polytechnical University, Xi'an, China
| | - Suihuai Yu
- Northwestern Polytechnical University, Xi'an, China
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Abdel-Malek DM, Foley RCA, Wakeely F, Graham JD, La Delfa NJ. Exploring Localized Muscle Fatigue Responses at Current Upper-Extremity Ergonomics Threshold Limit Values. HUMAN FACTORS 2022; 64:385-400. [PMID: 32757794 DOI: 10.1177/0018720820940536] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
OBJECTIVE The purpose of this study was to evaluate localized muscle fatigue responses at three upper-extremity ergonomics threshold limit value (TLV) duty cycles. BACKGROUND Recently, a TLV equation was published to help mitigate excessive development of localized muscle fatigue in repetitive upper limb tasks. This equation predicts acceptable levels of maximal voluntary contraction (% MVC) for a given duty cycle (DC). Experimental validation of this TLV curve has not yet been reported, which can help guide utilization by practitioners. METHOD Eighteen participants performed intermittent isometric elbow flexion efforts, in three separate counter-balanced sessions, at workloads defined by the American Conference of Governmental Industrial Hygenists' (ACGIH) TLV equation: low DC (20% DC, 29.6% MVC), medium DC (40% DC, 19.7% MVC), and high DC (60% DC, 13.9% MVC). Targeted localized muscle fatigue (LMF) of the biceps brachii was tracked across numerous response variables, including decline in strength (MVC), electromyography (EMG) amplitude and mean power frequency (MnPF), and several psychophysical ratings. RESULTS At task completion, biceps MnPF and MVC (strength) were significantly different between each TLV workload, with the high DC condition eliciting the largest declines in MnPF and MVC. CONCLUSION Findings demonstrate that working at different DCs along the ACGIH TLV curve may not be equivalent in preventing excessive LMF. Higher DC workloads elicited a greater LMF response across several response variables. APPLICATION High DC work of the upper extremity should be avoided to mitigate excess LMF development. Current TLVs for repetitive upper-extremity work may overestimate acceptable relative contraction thresholds, particularly at higher duty cycles.
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Claeson AA, Schwab FJ, Gandhi AA, Skaggs DL. Power-assisted Pedicle Screw Technique Protects Against Risk of Surgeon Overuse Injury: A Comparative Electromyography Study of the Neck and Upper Extremity Muscle Groups in a Simulated Surgical Environment. Spine (Phila Pa 1976) 2022; 47:E86-E93. [PMID: 33973563 DOI: 10.1097/brs.0000000000004097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Cadaveric. OBJECTIVE The aim of this study was to quantify the amplitude and duration of surgeons' muscle exertion from pedicle cannulation to screw placement using both manual and power-assisted tools in a simulated surgical environment using surface electromyography (EMG). SUMMARY OF BACKGROUND DATA A survey of Scoliosis Research Society members reported rates of neck pain, rotator cuff disease, lateral epicondylitis, and cervical radiculopathy at 3 ×, 5 ×, 10 ×, and 100 × greater than the general population. The use of power-assisted tools in spine surgery to facilitate pedicle cannulation through screw placement during open posterior fixation surgery may reduce torque on the upper limb and risk of overuse injury. METHODS Pedicle preparation and screw placement was performed from T4-L5 in four cadavers by two board-certified spine surgeons using both manual and power-assisted techniques. EMG recorded muscle activity from the flexor carpi radialis, extensor carpi radialis, biceps, triceps, deltoid, upper trapezius, and neck extensors. Muscle activity was reported as a percentage of the maximum voluntary exertion of each muscle group (%MVE) and muscle exertion was linked to low- (0-20% MVE), moderate- (20%-45% MVE), high- (45%-70% MVE) and highest- (70%-100% MVE) risk of overuse injury based on literature. RESULTS Use of power-assisted tools for pedicle cannulation through screw placement maintains average muscle exertion at low risk for overuse injury for every muscle group. Conversely with manual technique, the extensor carpi radialis, biceps, upper trapezius and neck extensors operate at levels of exertion that risk overuse injury for 50% to 92% of procedure time. Powerassisted tools reduce average muscle exertion of the biceps, triceps, and deltoid by upwards of 80%. CONCLUSION Power-assisted technique protects against risk of overuse injury. Elevated muscle exertion of the extensor carpi radialis, biceps, upper trapezius, and neck extensors during manual technique directly correlate with surgeons' self-reported diagnoses of lateral epicondylitis, rotator cuff disease, and cervical myelopathy.Level of Evidence: N/A.
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Johnen L, Mertens A, Nitsch V, Brandl C. Why cumulative loading calculated using non-weighted integration may not be suitable for assessing physical stress of the lower back: an empirical investigation of strain during lifting and lowering tasks. ERGONOMICS 2022; 65:134-146. [PMID: 34427545 DOI: 10.1080/00140139.2021.1962547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
When work-related physical stress is assessed using non-weighted integration, it is assumed that different loading conditions have a sufficiently comparable effect on the human body as long as the area under the loading curve is the same. Growing evidence cast doubt on whether this simple calculation can adequately estimate physical work-related strain. This study investigates in vivo, focussing on the lower back, whether the non-weighted method adequately reflects work-related physical strain of the lower back. Strain data resulting from lifting/lowering tasks performed in a laboratory study with an identical area under the loading curve but different load intensities were compared. Results showed that the non-weighted method does not sufficiently reflect the resulting muscular, cardiovascular and perceived strain but underestimates the influence of higher load intensity even in the range of medium physical exposure. Further research is needed regarding the determination of weighting factors and limit values. Practitioner Summary Given the dynamic nature of most physical work activities, the assessment of time-varying loading of the lower back is of particular interest in practice. Results show that the widely used non-weighted calculation method does not accurately reflect the resulting physical strain but underestimates the influence of higher load intensity.Abbreviations: MSD: musculoskeletal disorders; WMSD: work-related musculoskeletal disorders; KIM-LHC: Key Indicator Method Lifting, Holding, Carrying; RES: right erector spinae longissimus; LES: left erector spinae longissimus; HR: heart rate; RPE: rating of perceived exertion; EMG: surface electromyography; ECG: electrocardiography; SENIAM: Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles; MVC: maximum voluntary contraction; ANOVA: analysis of variance; Std. error: standard error HIGHLIGHTSResults of this empirical investigation suggest that the widely used non-weighted calculation method is not fully suitable for calculating cumulative loading of the lower back.Even in the range of medium physical exposure the non-weighted calculation method does not accurately reflect the resulting strain on the human body but tends to underestimate the influence of higher load intensity due to higher external weight.Despite the same cumulative loading value obtained when using the non-weighted method, the resulting physical strain values are generally about 20-25% higher.The results may be used to further develop ergonomic assessment methods in order to avoid a misclassification of loading conditions and to prevent the risk of overexertion.
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Affiliation(s)
- Laura Johnen
- Chair and Institute of Industrial Engineering and Ergonomics, RWTH Aachen University, Aachen, Germany
| | - Alexander Mertens
- Chair and Institute of Industrial Engineering and Ergonomics, RWTH Aachen University, Aachen, Germany
| | - Verena Nitsch
- Chair and Institute of Industrial Engineering and Ergonomics, RWTH Aachen University, Aachen, Germany
| | - Christopher Brandl
- Chair and Institute of Industrial Engineering and Ergonomics, RWTH Aachen University, Aachen, Germany
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Merlo A, Bò MC, Campanini I. Electrode Size and Placement for Surface EMG Bipolar Detection from the Brachioradialis Muscle: A Scoping Review. SENSORS 2021; 21:s21217322. [PMID: 34770627 PMCID: PMC8587451 DOI: 10.3390/s21217322] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/28/2021] [Accepted: 11/01/2021] [Indexed: 11/19/2022]
Abstract
The brachioradialis muscle (BRD) is one of the main elbow flexors and is often assessed by surface electromyography (sEMG) in physiology, clinical, sports, ergonomics, and bioengineering applications. The reliability of the sEMG measurement strongly relies on the characteristics of the detection system used, because of possible crosstalk from the surrounding forearm muscles. We conducted a scoping review of the main databases to explore available guidelines of electrode placement on BRD and to map the electrode configurations used and authors’ awareness on the issues of crosstalk. One hundred and thirty-four studies were included in the review. The crosstalk was mentioned in 29 studies, although two studies only were specifically designed to assess it. One hundred and six studies (79%) did not even address the issue by generically placing the sensors above BRD, usually choosing large disposable ECG electrodes. The analysis of the literature highlights a general lack of awareness on the issues of crosstalk and the need for adequate training in the sEMG field. Three guidelines were found, whose recommendations have been compared and summarized to promote reliability in further studies. In particular, it is crucial to use miniaturized electrodes placed on a specific area over the muscle, especially when BRD activity is recorded for clinical applications.
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Affiliation(s)
- Andrea Merlo
- LAM-Motion Analysis Laboratory, S. Sebastiano Hospital, Neuromotor and Rehabilitation Department, Azienda USL-IRCCS di Reggio Emilia, Via Circondaria 29, 42015 Correggio, Italy;
- Merlo Bioengineering, 43100 Parma, Italy;
| | | | - Isabella Campanini
- LAM-Motion Analysis Laboratory, S. Sebastiano Hospital, Neuromotor and Rehabilitation Department, Azienda USL-IRCCS di Reggio Emilia, Via Circondaria 29, 42015 Correggio, Italy;
- Correspondence:
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Richter M, Mazeres F, Brinkmann K. Clarity of task difficulty moderates the impact of the explicit achievement motive on physical effort in hand grip tasks. PLoS One 2021; 16:e0252713. [PMID: 34086786 PMCID: PMC8177448 DOI: 10.1371/journal.pone.0252713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 05/20/2021] [Indexed: 11/18/2022] Open
Abstract
Stable personality dispositions, like motives, are often assumed to exert a direct, stable impact on behavior. This also applies to the explicit achievement motive, which is supposed to influence the behavior that individuals select and how strongly they engage in it. Drawing on motivational intensity theory, we demonstrated in two studies that explicit achievement motive strength only predicted exerted force in a hand grip task if task difficulty was unclear. If task difficulty was clear, explicit achievement motive strength did not influence exerted force. Our findings suggest that the availability of information about the difficulty of motive satisfaction moderates the impact of the explicit achievement motive on behavior.
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Affiliation(s)
- Michael Richter
- Effort Lab, School of Psychology, Liverpool John Moores University, Liverpool, United Kingdom
| | - Florence Mazeres
- Geneva Motivation Lab, University of Geneva, Geneva, Switzerland
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Hsiao CK, Tu YK, Tsai YJ, Yang CY, Lu CW. Forearm muscular strength and performance fatigability in orthopaedic surgeons when performing bone screw fixations. APPLIED ERGONOMICS 2020; 87:103135. [PMID: 32501253 DOI: 10.1016/j.apergo.2020.103135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 04/15/2020] [Accepted: 04/21/2020] [Indexed: 06/11/2023]
Abstract
This study investigated the muscle strength and performance fatigability of the forearms in eight male orthopaedic surgeons when performing bone screw fixations. Each surgeon performed an eight-bone screws operations in a porcine femur model to simulate fractural fixation using plating technique. The pre- and post-fatigue maximum isometric forces and corresponding electromyography responses were measured to assess the forearm muscle strength loss and fatigue due to screwing. Results showed that after eight bone screws were inserted, the maximal grip force, maximal driving torque and maximal push force losses were approximately 29%, 20% and 23%, respectively. While the grip force and/or driving torque acting, both the brachioradialis and extensor carpi ulnaris had a higher percentage change of EMG than the biceps brachii. The driving forces decreased with the number of screw insertions; however, the insertion time increased parabolically with the number of screws and significantly decreased the insertion rate of the screws, indicating that forearm muscle fatigue may occur in surgeons who treat fracture fixation using more than eight bone screws.
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Affiliation(s)
- Chih-Kun Hsiao
- Department of Public Health, Kaohsiung Medical University, Kaohsiung, 807, Taiwan; Department of Orthopaedics, E-Da Hospital, Kaohsiung, 824, Taiwan
| | - Yuan-Kun Tu
- Department of Orthopaedics, E-Da Hospital, Kaohsiung, 824, Taiwan
| | - Yi-Jung Tsai
- Department of Orthopaedics, E-Da Hospital, Kaohsiung, 824, Taiwan
| | - Chun-Yuh Yang
- Department of Public Health, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
| | - Chih-Wei Lu
- Department of Industrial and Systems Engineering, Chung Yuan Christian University, Chung Li, 320, Taiwan.
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Looft JM, Frey-Law LA. Adapting a fatigue model for shoulder flexion fatigue: Enhancing recovery rate during intermittent rest intervals. J Biomech 2020; 106:109762. [PMID: 32517992 PMCID: PMC8848298 DOI: 10.1016/j.jbiomech.2020.109762] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 03/18/2020] [Accepted: 03/18/2020] [Indexed: 12/01/2022]
Abstract
Although the rotator cuff muscles are susceptible to fatigue, shoulder fatigue studies reporting torque decline during intermittent tasks are relatively uncommon in the literature. A previous modification to the three-compartment controller (3CC) fatigue model incorporated a rest recovery multiplier (3CC-r model) to represent augmented blood flow to muscle during rest intervals (Looft et al., 2018). A rest recovery value of r = 15 was optimal for ankle, knee, and elbow joint regions, whereas r = 30 was better for hand/grip muscles. However, shoulder torque decline data was unavailable in the literature for comparison. Thus, the purpose of this study was to collect fatigue data for two different intermittent, isometric shoulder flexion fatiguing tasks and assess the 3CC-r model with r = 15 or 30 compared to the original 3CC model. Twenty healthy participants (9 M) completed two fatigue tasks: 50% maximum voluntary contraction (MVC) with 50% duty cycle (DC) and 70% MVC with 70% DC. MVCs were assessed at discrete time points (1, 3, 5, 10, and 15 min) until endurance time (MET). Mean observed percent torque decline (%TD) for the two tasks were compared to three model estimates: 3CC-r (using r = 15 and r = 30) and 3CC. Using these data, we confirmed that the addition of a rest multiplier (r = 15 somewhat better than r = 30) substantially improved predictions of shoulder fatigue using a previously validated analytical fatigue model (3CC). The relatively large reduction in model errors over the original model suggests the importance of representing augmented recovery during rest periods.
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Affiliation(s)
- John M Looft
- Minneapolis VA Health Care System, Minneapolis, MN 55417, United States; Department of Physical Therapy and Rehabilitation Science, University of Iowa, Iowa City, IA 52442, United States.
| | - Laura A Frey-Law
- Department of Physical Therapy and Rehabilitation Science, University of Iowa, Iowa City, IA 52442, United States
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Whittaker RL, Sonne MW, Potvin JR. Ratings of perceived fatigue predict fatigue induced declines in muscle strength during tasks with different distributions of effort and recovery. J Electromyogr Kinesiol 2019; 47:88-95. [PMID: 31136944 DOI: 10.1016/j.jelekin.2019.05.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 04/18/2019] [Accepted: 05/17/2019] [Indexed: 11/29/2022] Open
Abstract
The purpose of this study was to quantify the relationship between ratings of perceived fatigue (RPF), using a modified Borg CR-10 scale, and muscle fatigue accumulation, as defined by maximal voluntary contraction strength (MVC) declines, during two complex MVC-relative tasks (conditions) that cause muscle fatigue and allow recovery. Nine female participants completed the fatiguing tasks, composed of a series of submaximal, isometric efforts (task plateaus) requiring isometric flexion at the distal interphalangeal joint of the thumb. Significant partial correlations between RPF and MVC, while controlling for task plateau intensity (%MVC), were found in 6/9 participants. A significant linear regression model, explaining 86.2% of the variance in mean MVC decline, was obtained with 3 predictor variables: mean RPF (p < 0.001), Task Plateau (p < 0.001), and the interaction between mean RPF and Task Plateau (RPF × Task Plateau; p = 0.014). The observed linear relationship between RPF and MVC declines, both at the participant and group level support, the use of RPF to estimate the instantaneous fatigue status of the muscle in tasks that allow both muscle fatigue and recovery.
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Affiliation(s)
| | - Michael W Sonne
- Department of Kinesiology, McMaster University, Hamilton, Canada
| | - Jim R Potvin
- Department of Kinesiology, McMaster University, Hamilton, Canada.
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Myers E, Triscari R. Comparison of the strength endurance parameters for the Baltimore Therapeutic Equipment (BTE) Simulator II and the Jamar Handgrip Dynamometer. Work 2017; 57:95-103. [DOI: 10.3233/wor-172542] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Edwin Myers
- Occupational Therapy Program, Department of Rehabilitation Sciences, Marieb College of Health and Human Services, Florida Gulf Coast University, Fort Myers, FL, USA
| | - Robert Triscari
- College of Education, Florida Gulf Coast University, Fort Myers, FL, USA
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13
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Ramakrishnan VR, Milam BM. Ergonomic analysis of the surgical position in functional endoscopic sinus surgery. Int Forum Allergy Rhinol 2017; 7:570-575. [DOI: 10.1002/alr.21911] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 11/21/2016] [Accepted: 12/13/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Vijay R. Ramakrishnan
- Department of Otolaryngology; University of Colorado; Aurora CO
- Department of Neurosurgery; University of Colorado; Aurora CO
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14
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Sonne MW, Potvin JR. Fatigue accumulation and twitch potentiation during complex MVC-relative profiles. J Electromyogr Kinesiol 2015; 25:658-66. [DOI: 10.1016/j.jelekin.2015.04.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 03/16/2015] [Accepted: 04/13/2015] [Indexed: 11/27/2022] Open
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15
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Sonne MW, Potvin JR. A modified version of the three-compartment model to predict fatigue during submaximal tasks with complex force-time histories. ERGONOMICS 2015; 59:85-98. [PMID: 26018327 DOI: 10.1080/00140139.2015.1051597] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 05/04/2015] [Indexed: 06/04/2023]
Abstract
UNLABELLED The three-compartment model (3CM) was validated previously for prediction of endurance times by modifying its fatigue and recovery rates. However, endurance times do not typically represent work demands, and it is unknown if the current version of the 3CM is applicable for ergonomics analysis of all occupational tasks. The purpose of this study was to add biological fidelity to the 3CM, and validate the model against a series of submaximal force plateaus. The fatigue and recovery rates were modified to represent graded physiological motor unit characteristics (termed 3CM(GMU)). In nine experiments of submaximal efforts, the 3CM(GMU) produced a root-mean squared difference (RMSD) of 4.1 ± 0.5% MVC over experiments with an average strength loss (i.e., fatigue) of 31.0 ± 1.1% MVC. The 3CM(GMU) model performed poorly for endurance tasks. The 3CM(GMU) model is an improvement for evaluating submaximal force patterns consisting of intermittent muscle contractions of the hand and forearm. PRACTITIONER SUMMARY We modified an existing fatigue model using known physiological properties in order to predict fatigue during nine different submaximal force profiles; consistent with efforts seen in industrial work. We expect this model to be included in digital human modelling software, for the assessment of repetitive work and muscle fatigue in repetitive tasks. SOCIAL MEDIA Summary: The proposed model has applications for estimating task fatigue in proactive ergonomic analyses of complex force patterns using digital human models.
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Affiliation(s)
- Michael W Sonne
- a Department of Kinesiology , McMaster University, Ivor Wynne Centre , Room 219A, 1280 Main Street West, Hamilton , Ontario , Canada L8S 4K1
| | - Jim R Potvin
- a Department of Kinesiology , McMaster University, Ivor Wynne Centre , Room 219A, 1280 Main Street West, Hamilton , Ontario , Canada L8S 4K1
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