Quantification of Ride Comfort Using Musculoskeletal Mathematical Model Considering Vehicle Behavior

This research aims to quantify driver ride comfort due to changes in damper characteristics between comfort mode and sport mode,considering the vehicle’s inertial behavior.The comfort of riding in an automobile has been evaluated in recent years on the basis of a subjective sensory evaluation given by the driver.However,reflecting driving sensations in design work to improve ride comfort is abstract in nature and difficult to express theoretically.Therefore,we evaluated the human body’s effects while driving scientifically by quantifying the driver’s behavior while operating the steering wheel and the behavior of the automobile while in motion using physical quantities.To this end,we collected driver and vehicle data using amotion capture system and vehicle CAN and IMU sensors.We also constructed a three-dimensional musculoskeletal mathematical model to simulate driver movements and calculate the power and amount of energy per unit of time used for driving the joints and muscles of the human body.Here,we used comfort mode and sport mode to compare damper characteristics in terms of hardness.In comfort mode,damper characteristics are soft and steering stability is mild,but vibration from the road is not easily transmitted to the driver making for a lighter load on the driver.In sport mode,on the other hand,damper characteristics are hard and steering stability is comparatively better.Still,vibration from the road is easily transmitted to the driver,whichmakes it easy for a load to be placed on the driver.As a result of this comparison,it was found that a load was most likely to be applied to the driver’s neck.This result in relation to the neck joint can therefore be treated as an objective measure for quantifying ride comfort.

Adult-onset hypophosphatemic osteomalacia as a cause of widespread musculoskeletal pain:A retrospective case series of single center experience

BACKGROUND Osteomalacia(OM)is frequently confused with various musculoskeletal or other rheumatic diseases,especially in patients with adult-onset widespread musculoskeletal pain because of its low prevalence and non-specific manifestations.AIM To facilitate the early diagnosis and etiology-specific treatment of adult-onset hypophosphatemic OM.METHODS A retrospective review of medical records was performed to screen adult patients who visited a physiatry locomotive medicine clinic(spine and musculoskeletal pain clinic)primarily presenting with widespread musculoskeletal pain at a single tertiary hospital between January 2011 and December 2019.We enrolled patients with hypophosphatemia,high serum bone-specific alkaline phosphatase levels,and at least one imaging finding suggestive of OM.RESULTS Eight patients with adult-onset hypophosphatemic OM were included.The back was the most common site of pain.Proximal dominant symmetric muscle weakness was observed in more than half of the patients.Bone scintigraphy was the most useful imaging modality for diagnosing OM because radiotracer uptake in OM showed characteristic patterns.Six patients were diagnosed with adefovir(ADV)-induced Fanconi syndrome,and the other two patients were diagnosed with tumor-induced OM and light-chain nephropathy,respectively.After phosphorus and vitamin D supplementation and treatment for the underlying etiologies,improvements in pain,muscle strength,and gait were observed in all patients.CONCLUSION Mechanical pain characteristics,hypophosphatemia,and distinctive bone scintigraphy patterns are the initial diagnostic indicators of adult-onset hypophosphatemic OM.ADV-induced Fanconi syndrome is the most common etiology of hypophosphatemic OM in hepatitis B virus-endemic countries.

Epidemiological Patterns of Work-Related Musculoskeletal Disorders among Healthcare Workers in Five Reference Hospitals in the City of Douala, Cameroon

Introduction: Work-related musculoskeletal disorders (WRMSDs) are a public health problem and have forced many workers to quit their jobs prematurely. This study investigated the prevalence and risk factors of WRMSDs among Healthcare workers in five reference hospitals in the City of Douala-Cameroon. Methods: A cross-sectional study was conducted in 2022 among 561 healthcare workers working in five reference hospitals in the city of Douala, Cameroon. Participants were selected using a convenient sampling technique. Data were collected with structured questionnaires;data on the demographics and risk factors were collected using a well-designed questionnaire, while estimation of the prevalence of WRMSDs was done using the Modified Nordic questionnaire. Results: The overall prevalence rate of WRMSDs among healthcare workers in Douala hospitals was 83.4% (468/561). The prevalence per professional groups was as follows: 88.8% (71) for Medical Laboratory Scientists (MLS), 81.9% (289) for nurses, 21 (80.8%) for Physiotherapists (PTs) and 78.8% (41) for Medical Doctors (MDs). There was a significant difference (p = 0.001) in the prevalence of WRMSDs with respect to place of work where healthcare workers from HLD recorded the highest prevalence 89.9%, while Healthcare workers from NBDH were 2.91 times at risk (AOR = 2.91;95% CI: 1.32 - 6.41;p = 0.001) to develop WRMSDs than healthcare workers in the other hospitals. With respect to body region, the highest prevalence of WRMSDs was recorded on the lower back, 58.8% with the lowest at the elbows 11.2%. The age group 30 to 39 years was significantly associated with WRMSDs at level of the shoulder (p = 0.002), upper back (p = 0.019), elbows (p Conclusion: The overall prevalence rate of WRMSDs among healthcare workers in Douala hospitals was high. The prevalence of WRMSDs is highest among MLS and nurses and the most affected body parts are;lower back, neck and upper back. Working on the same posture, stressful job, and repetitive tasks were the major risk factors associated to WRMSDs among healthcare workers in Douala hospitals.

High Prevalence of Musculoskeletal Disorders and Self-Medication among Street Vendors in Bangui, Central African Republic (CAR)

Introduction: Musculoskeletal disorders (MSDs) are a set of peri-articular conditions that result mainly in pain and functional discomfort. They represent a major occupational health problem in all areas of activity. The objective of this work was to determine the prevalence of MSDs among street vendors in the city of Bangui in the Central African Republic (CAR). Methods: A cross-sectional study was conducted from September 01 to October 31, 2021 in Bangui, the capital of CAR. The study population consisted of street vendors which were included at the entrance of 4 large markets of Bangui after giving informed consent. The sample size, calculated according to the Schwartz formula, was 384. Sociodemographic data (age, gender, level of education, marital status), professional data (the duration of sale in hours, the distance traveled per day);and health data (the health problems suffered by itinerant sellers and the means of dealing with them) were collected using a pre-established self-questionnaire. This collected data was processed using Microsoft Excel 2013 and Epi-Info version 7 software. Results: Among 384 street vendors included, women represented a quarter (24.9%). The average age was 27 years;the 25-34 age group was the most represented (50%). About two-thirds (64.8%) sold for at least 12 hours and traveled more than 10 km (69.3%) per day. The main health problems reported by street vendors were musculoskeletal disorders (95.8%). Their locations concerned the upper limbs shoulder 65.36% (251), elbow 24.22% (93). Non-ergonomic postures that stress the back and joints all day long, causing pain are risk factors for MSDs. These MSDs were treated by self-medication with non-steroidal anti-inflammatory drugs (22.0%), mainly sold on the street. Conclusion: MSDs dominated the health problems of street vendors. These problems raise the need for recognition and support for these workers to optimize their performance while preserving their health through awareness and good management of MSDs whose chronicity generates a disability.

Musculoskeletal Ultrasonography for the Assessment of Combined Drug Therapy for Rheumatoid Arthritis

Background: To evaluate the effect of treatment on musculoskeletal ultrasound (MSUS) and explore whether MSUS are associated with therapeutic response in rheumatoid arthritis (RA) patients treated with Tofacitinib in combination with methotrexate (MTX). Methods: We enrolled 102 RA patients treated with Tofacitinib in combination with MTX from a multicenter, exploratory, short-term, prospective and observational ultrasound cohort study of patients who received biologic or targeted synthetic disease-modifying antirheumatic drug (DMARD) therapy. We evaluated the patients’ clinical disease activity and musculoskeletal ultrasound (MSUS) scores. The serum concentrations of two venous blood inflammatory indicators were evaluated (c-reactive protein [CRP], erythrocyte sedimentation rate [ESR]) by multiplex bead assays at baseline, 3, and 6?months: the change over 6?months was defined as the P value. Before MSUS score treatment, an associate chief physician tested the wrist joints of each patient at the first treatment, and the attending physician with 3 years of MSUS experience and 7 years of work experience also performed semi-quantitative scores on the same RA patients and tested the consistency of the results. Results: Tofacitinib in combination with MTX significantly improved the clinical disease activity and MSUS score over 6?months. Serum ESR and CRP were significantly elevated at 6?months after the Tofacitinib in combination with MTX introduction (P P P Conclusions: MSUS scores may be useful for predicting RA patients’ therapeutic responses to abatacept.

Hepatomusculoskeletal disorders:Coining a new term might improve the management of the musculoskeletal manifestations of chronic liver disease

Chronic liver disease can affect many body systems including the musculoskeletal system.The pathogenetic crosstalk between the liver and organs such as the brain and the kidneys has already been described with compound terms merging the organs affected by the pathology,such as the hepatorenal syndrome.Nevertheless,the musculoskeletal manifestations of chronic liver disease have not been coined with such a term to date.Because of this shortage,documenting the musculoskeletal implications of chronic liver disease in both research and clinical practice is challenging.To fill this gap,the authors propose the term hepatomusculoskeletal disorders,a compound term of Greek origin that encompasses all the body structures involved in the aforementioned pathologic crosstalk.

Stochastic resonance whole body vibration reduces musculoskeletal pain:A randomized controlled trial

AIM:To examined the effects of stochastic resonance whole-body vibration training on musculoskeletal pain in young healthy individuals.METHODS:Participants were 43 undergraduate students of a Swiss University.The study was designed as a randomized controlled trial(RCT)with randomized group allocation.The RCT consisted of two groups each given 12 training sessions during four weeks with either 5 Hz-Training frequency(training condition)or 1.5 Hz Training frequency(control condition).Outcome was current musculoskeletal pain assessed in the evening on each day during the four week training period.RESULTS:Multilevel regression analysis showed musculoskeletal pain was significantly decreased in the training condition whereas there was no change in the control condition(B=-0.023,SE=0.010,P=0.021).Decrease in current musculoskeletal pain over four weeks was linear.CONCLUSION:Stochastic resonance whole-body vibration reduced musculoskeletal pain in young healthy individuals.Stochastic resonance vibration and not any other exercise component within training caused pain reduction.

A comprehensive musculoskeletal and peripheral nervous system assessment of war-related bilateral upper extremity amputees

Background: Upper limb amputations are one of the unpleasant war injuries that armed forces are exposed to frequently. The present study aimed to assess the musculoskeletal and peripheral nervous systems in Iraq-Iran war veterans with bilateral upper extremity amputation.Methods: The study consisted of taking a history and clinical examinations including demographic data, presence and location of pain, level of amputation, passive and active ranges of movement of the joints across the upper and lower extremities and spine, manual palpation, neurological examination, blood circulation pulses and issues related to a prosthetic limb. In this study, 103 Iranian bilateral upper extremity amputees(206 amputations) from the IranIraq war were evaluated, and a detailed questionnaire was also administered.Results: The most common level of amputation was the finger or wrist level(108, 52.4%). Based on clinical examination, we found high frequencies of limited active and passive joint range of movement across the scapula, shoulder, elbow, wrist and metacarpophalangeal, interphalangeal and thumb joints. Based on muscle strength testing, we found varying degrees of weakness across the upper limbs. Musculoskeletal disorders included epicondylitis(65, 31.6%), rotator cuff injury(24, 11.7%), bicipital tendonitis(69, 33.5%), shoulder drop(42, 20.4%) and muscle atrophy(19, 9.2%). Peripheral nerve disorders included carpal tunnel syndrome in 13(6.3%) and unilateral brachial plexus injury in 1(1%). Fifty-three(51.5%) were diagnosed with facet joint syndrome at the level of the cervical spine(the most frequent site). Using a prosthesis was reported by 65(63.1%), both left and right sides. The back was the most common site of pain(71.8%).Conclusion: The high prevalence of neuro-musculoskeletal disorders among bilateral upper extremity amputees indicates that they need regular rehabilitation care.

Risk factors for musculoskeletal injuries in the military: a qualitative systematic review of the literature from the past two decades and a new prioritizing injury model

Background: Musculoskeletal injuries(MSkIs) are a leading cause of health care utilization, as well as limited duty and disability in the US military and other armed forces. MSkIs affect members of the military during initial training,operational training, and deployment and have a direct negative impact on overall troop readiness. Currently, a systematic overview of all risk factors for MSkIs in the military is not available.Methods: A systematic literature search was carried out using the PubMed, Ovid/Medline, and Web of Science databases from January 1, 2000 to September 10, 2019. Additionally, a reference list scan was performed(using the “snowball method”). Thereafter, an international, multidisciplinary expert panel scored the level of evidence per risk factor, and a classification of modifiable/non-modifiable was made.Results: In total, 176 original papers and 3 meta-analyses were included in the review. A list of 57 reported potential risk factors was formed. For 21 risk factors, the level of evidence was considered moderate or strong. Based on this literature review and an in-depth analysis, the expert panel developed a model to display the most relevant risk factors identified, introducing the idea of the “order of importance” and including concepts that are modifiable/nonmodifiable, as well as extrinsic/intrinsic risk factors.Conclusions: This is the qualitative systematic review of studies on risk factors for MSkIs in the military that has attempted to be all-inclusive. A total of 57 different potential risk factors were identified, and a new, prioritizing injury model was developed. This model may help us to understand risk factors that can be addressed, and in which order they should be prioritized when planning intervention strategies within military groups.

Gut microbiota and obesity:Impact of antibiotics and prebiotics and potential for musculoskeletal health

Obesity is a complex disease with multiple contributing factors.One of the most intensely studied factors during the past decade has been the gut microbiota,which is the community of all microbes in the intestinal tract.The gut microbiota,via energy extraction,inflammation,and other actions,is now recognized as an important player in the pathogenesis of obesity.Dysbiosis,or an imbalance in the microbial community,can initiate a cascade of metabolic disturbances in the host.Early life is a particularly important period for the development of the gut microbiota,and perturbations such as with antibiotic exposure can have long-lasting consequences for host health.In early life and throughout the life span,diet is one of the most important factors that shape the gut microbiota.Although diets high in fat and sugar have been shown to contribute to dysbiosis and disease,dietary fiber is recognized as an important fermentative fuel for the gut microbiota and results in the production of short-chain fatty acids that can act as signaling molecules in the host.One particular type of fiber,prebiotic fiber,contributes to changes in the gut microbiota,the most notable of which is an increase in the abundance of Bifidobacterium.This review highlights our current understanding of the role of gut microbiota in obesity development and the ways in which manipulating the microbiota through dietary means,specifically prebiotics,could contribute to improved health in the host,including musculo skeletal health.

Prevalence and factors of work-related musculoskeletal disorders among hand surgeons

BACKGROUND The nature of tasks required by hand surgeons require both forceful and repetitive maneuvers,thus subjecting these surgeons to the risk of musculoskeletal(MSK)injuries during their years in practice.AIM To assess the prevalence,characteristics and impact of MSK disorders among hand surgeons.METHODS A modified version of the physical discomfort survey was sent to surgeons who were members of the American Society for Surgery of the Hand via e-mail.The collected data were analyzed using descriptive statistics,one-way analysis of variance,and Fisher’s exact test.P values of<0.05 were considered statistically significant.RESULTS Of the 578 respondents,60.4%reported that they had sustained a work-related MSK injury,of which the most common diagnoses were lateral elbow epicondylitis(18.7%),low back pain(17.1%)and carpal tunnel syndrome(15.6%).Among those that reported an injury,73.1%required treatment and 29.2%needed time off work as a direct result of their injury.The number of work-related injuries incurred by a surgeon increased significantly with increasing age(P<0.003),increasing years in practice(P<0.001)and higher case load(P<0.05).CONCLUSION To our knowledge this study is the first of its kind to assess MSK injuries sustained by Hand surgeons with a high incidence.These results should increase awareness on this aspect and fuel future studies directed at preventing these types of work-related injuries,thus minimizing the financial and psychological burden on these surgeons and the healthcare system.

Ultrasound-assisted musculoskeletal procedures:A practical overview of current literature

Traditionally performed by a small group of highly trained specialists,bedside sonographic procedures involving the musculoskeletal system are often delayed despite the critical need for timely diagnosis and treatment.Due to this limitation,a need evolved for more portability and accessibility to allow performance of emergent musculoskeletal procedures by adequately trained non-radiology personnel.The emergence of ultrasound-assisted bedside techniques and increased availability of portable sonography provided such an opportunity in select clinical scenarios.This review summarizes the current literature describing common ultrasound-based musculoskeletal procedures.In-depth discussion of each ultrasound procedure including pertinent technical details,indications and contraindications is provided.Despite the limited amount of prospective,randomized data in this area,a substantial body of observational and retrospective evidence suggests potential benefits from the use of musculoskeletal bedside sonography.

Expert consensus of Chinese Association for the Study of Pain on the non-opioid analgesics for chronic musculoskeletal pain

Chronic musculoskeletal pain(CMP)is a common occurrence in clinical practice and there are a variety of options for the treatment of it.However,the pharmacological therapy is still considered to be a primary treatment.The recent years have witnessed the emergence of opioid crisis,yet there are no relevant guidelines on how to treat CMP with non-opioid analgesics properly.The Chinese Medical Association for the Study of Pain convened a panel meeting to develop clinical practice consensus for the treatment of CMP with non-opioid analgesics.The purpose of this consensus is to present the application of nonsteroidal antiinflammatory drugs,serotonin norepinephrine reuptake inhibitors,serotonin and norepinephrine reuptake inhibitors,muscle relaxants,ion channel drugs and topical drugs in CMP.

Work-related musculoskeletal injuries among upper extremity surgeons:A web-based survey

BACKGROUND Work-related injuries have gained recent attention,especially in the orthopaedic literature.As upper extremity orthopaedic surgical tasks require repetitive and constant maneuvers,these surgeons can be at increased risk of acquiring workrelated musculoskeletal(MSK)disorders during their years in practice.AIM To assess the prevalence,characteristics and impact of MSK disorders among upper extremity orthopaedic surgeons.METHODS A modified version of the physical discomfort survey was sent to surgeons who were members of the American Shoulder and Elbow Surgeons and the Canadian shoulder and elbow society via e-mail.The collected data were analyzed using descriptive statistics,one-way analysis of variance,and Fisher's exact test.P values of<0.05 were considered statistically significant.RESULTS Of the 142 respondents,90.8% were males and the majority were younger than 55 years old(65.5%).A work-related MSK injury was reported by 89.4% of respondents,of which the most common diagnoses were low back pain(26.1%)and lateral elbow epicondylitis(18.3%).Among those that reported an injury,82.7%required treatment and 26% required time off work as a direct result of their injury.The need to undergo treatment due to the injury was associated with increased number of injuries(P<0.01).Moreover,surgeons were more likely to require time off work when they had been in practice for>21 years(P<0.05).CONCLUSION A high proportion of surgeons in our survey reported MSK injuries,with more than one quarter of surgeons reported requiring time off work due to an MSK injury.The high incidence of these disorders may place a financial and psychological burden on surgeons and affect their ability to provide patient care.Awareness of operative ergonomics,irrespective of surgical specialty may help to decrease or possibly prevent the occurrence of these disorders.

Update in combined musculoskeletal and vascular injuries of the extremities

Combined musculoskeletal and vascular injuries of the extremities are conditions in which a multidisciplinary approach is a sine qua non to ensure life initially and limb viability secondarily.Vascular injuries as part of musculoskeletal trauma are usually the result of the release of a high energy load in the wound site so that the prognosis is determined by the degree of soft-tissue damage,duration of limb ischemia,patient’s medical status and presence of associated injuries.The management of these injuries is challenging and requires a specific algorithm of action,because they are usually characterized by increased morbidity,amputation rate,infection,neurological and functional deficits,and they could be life threatening.Although vascular injuries are rare and occur either isolated or in the context of major combined musculoskeletal trauma,the high index of suspicion,imaging control,and timely referral of the patient to organized trauma centers ensure the best functional outcome of the extremity in such challenging cases.Even after a successful initial treatment of a combined trauma pattern,long-term follow-up is crucial to prevent and detect early possible complications.The purpose of this manuscript is to provide an update on diagnosis and treatment of combined musculoskeletal and vascular injuries of the extremities,from an orthopedic point of view.

The Application of NIOSH Lifting Equation to Prevent Musculoskeletal Disorder Risks

The objective of the study was to reduce musculoskeletal disorder risks by applying the NIOSH lifting equation variables include the horizontal location, the vertical location, the vertical travel distance, the asymmetric, the lifting frequency and the coupling classification. The 17 specific samples from 4W and ZECP division were selected by the weight of box 15.4 - 28.7 pounds. The standardized Nordic questionnaire for the analysis of musculoskeletal symptoms with pain scale from 0 (no pain) to 10 (worst pain) was used to self-report feeling. The ergonomics redesigns trained for the workers included: 1) brought the load closer to the worker by training;2) raised the height of objects placed to reduce the vertical distance between the origin and destination of the lift;and 3) moved the origin and destination of lift closer together to reduce the angel twist. The new procedures were trained to all participated workers. The result found that the lifting index was safer (<1.0). For successful outcome, be supposed to monitoring is careful the data about a problem of the worker health, give the carefulness in case of specially exceed environment more than the LI advises and should do training continuously.

Frequency of Musculoskeletal Pain and Associated Factors among Undergraduate Students

Objective: To study and compare the prevalence of musculoskeletal pain in Medical and non-medical students and find out the specific factors associated with the occurrence of this pain. Methodology: This is a cross-sectional study from March-May 2017 where a total of 400 medical and 350 non-medical students were registered using a structured questionnaire made by modification of Nordic questionnaire. Characteristics of musculoskeletal pain were determined Pain was also graded by using a grading scale. Results: Mean age for medical and non-medical students was 21.36 and 20.97 respectively. The prevalence of musculoskeletal pain was higher among females. More data were collected from 2nd and 5th year of medical and 1st and 2nd year of non-medical students. High incidence was found in medical students with occurrence mostly in Neck. This frequency of musculoskeletal pain was quiet high during the last 7 days. The long study hours and use of computer/laptop were found to be greater among medical undergraduates but no significant association was found in medical unlike non-medical students. Majority of undergraduate students reported a normal BMI. Our study has found no co-relation of BMI with prevalence of pain. It was also observed that medical students with musculoskeletal pain spent more time on travelling when compared to non-medical. Association was found with the use of back packs. The study observed the level of many daily activities like exercise and outdoor sports etc. but no significant relation was found. Conclusion: Prevalence of musculoskeletal pain among undergraduate students is truly high, more so in medical students. Medical students have shown no association of studying for long hours and use of computer/laptop with musculoskeletal pain when compared to non-medical students. More studies should be done to know contributing factors of musculoskeletal pain among undergraduate students.

Clinical Effective Evaluation of Tongren Dahuoluo Pill (同仁大活络丸) on Knee Osteoarthritis by Musculoskeletal Ultrasound

Objective:To evaluate the clinical effect of Tongren Dahuoluo Pill(同仁大活络丸)on knee osteoarthritis by musculoskeletal ultrasonography.Methods:From March 2019 to December 2019,45 patients with knee osteoarthritis were collected from the outpatient department of the First Medical Center of PLA General Hospital.Tongren Dahuoluo Pill(同仁大活络丸)was given oral treatment for 12 weeks.VAS score,Lequesne score and WOMAC score were recorded before and after treatment,and the changes of knee joint effusion and synovial hyperplasia were observed by musculoskeletal ultrasonography.Results:Among the 45 patients,18 were male and 27 were female,with the average age of(62.07±9.08)years old,and average disease course of(6.83±7.01)years.The VAS score,Lequesne score and WOMAC score were significantly reduced compared with before treatment,and the difference was statistically significant(P<0.01).We observed that joint effusion range and joint synovial hyperplasia thickness of knee osteoarthritis significantly reduced with Tongren Dahuoluo Pill(同仁大活络丸)treatment by musculoskeletal ultrasonography,and the difference were statistically significant(P<0.01).Conclusion:Tongren Dahuoluo Pill(同仁大活络丸)can not only relieve the clinical symptoms of knee osteoarthritis,but also effectively inhibit synovitis hyperplasia of knee joint.

Quantifying Roll Feel of a Car by Using a Musculoskeletal Mathematical Model

Primary purpose of this research is to create a three-dimensional musculoskeletal mathematical model of a driver of a car using a motion capture system.The model is then used in an analysis of drive torque around joints and attached muscles as a vehicle travels in different travel modes and damping force settings to examine‘burdens’for the driver.Previous studies proposed a method of quantifying the degree of musculoskeletal load in simple human motion from the changes in drive torque around joints and attached muscles.However,examination of the level of burdens for the driver while driving using this method does not seem to exist.Especially within the scope of evaluating different travel modes and dampers,there is no other study.Results of this study are hence a valuable new perspective on quantitative analysis of the burdens for the driver’s joints and muscles depending on the different settings of travel modes and dampers.

Using a Musculoskeletal Mathematical Model to Analyze Fatigue of the Muscles in the Lower Limbs during Different Motions

Under the aim of finding effective rehabilitation solutions,the difference between the extents of fatigue of each muscle used in different motions are compared.Previous research suggested methods for estimating muscle torque and muscle tension on the basis of a musculoskeletal model.As a result,it has become possible to quantitatively identify the extent of fatigue in each muscle during motion.Therefore,to evaluate muscle fatigue more quantitatively,driving power and angular momentum are focused on.Based on the driving torque of joints and the muscle torque calculated by using a three-dimensional musculoskeletal model,a method for calculating the driving power of joints and the angular momentum of a muscle is proposed.This method is applied to analysis of different motions.Moreover,fatigue of muscles is quantitatively analyzed on the basis of driving power and angular momentum.