Mark C. Schall
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View article: Differential Sources of Distress in Clinical and Research Trainees: A Focus on Work and Role Relationships
Differential Sources of Distress in Clinical and Research Trainees: A Focus on Work and Role Relationships Open
Our study indicates that trainees experience high levels of distress, although the sources differ. To effectively address these challenges, organizations should implement interventions targeted to address specific stressors of each group.
View article: Analysis of seat belt buckle release forces in post-rollover scenarios: Implications for passenger safety
Analysis of seat belt buckle release forces in post-rollover scenarios: Implications for passenger safety Open
Seat belts have been in use for nearly 140 years and have a proven track record to be the single most effective tool in reducing fatal and nonfatal injuries in motor vehicle crashes (MVCs). However, belted passengers still contribute to mo…
View article: Scan/rescan reliability of magnetic resonance imaging (MRI)
Scan/rescan reliability of magnetic resonance imaging (MRI) Open
Background Magnetic resonance imaging (MRI) is increasingly used to estimate the geometric dimensions of lower lumbar vertebrae. While MRI-based measurements have demonstrated good reliability with interclass correlation coefficients (ICCs…
View article: A Hierarchical-Based Learning Approach for Multi-Action Intent Recognition
A Hierarchical-Based Learning Approach for Multi-Action Intent Recognition Open
Recent applications of wearable inertial measurement units (IMUs) for predicting human movement have often entailed estimating action-level (e.g., walking, running, jumping) and joint-level (e.g., ankle plantarflexion angle) motion. Althou…
View article: Evaluating the Performance of Joint Angle Estimation Algorithms on an Exoskeleton Mock-Up via a Modular Testing Approach
Evaluating the Performance of Joint Angle Estimation Algorithms on an Exoskeleton Mock-Up via a Modular Testing Approach Open
A common challenge for exoskeleton control is discerning operator intent to provide seamless actuation of the device with the operator. One way to accomplish this is with joint angle estimation algorithms and multiple sensors on the human–…
View article: Gauging the Technology Acceptance of Manufacturing Employees: A New Measure for Pre-Implementation
Gauging the Technology Acceptance of Manufacturing Employees: A New Measure for Pre-Implementation Open
Recent technological advances are bringing about the digitalization of manufacturing, enabled by introducing and integrating new and improved technologies into existing processes and activities. Integrating advanced technologies into the w…
View article: The Effect of Sensor Feature Inputs on Joint Angle Prediction across Simple Movements
The Effect of Sensor Feature Inputs on Joint Angle Prediction across Simple Movements Open
The use of wearable sensors, such as inertial measurement units (IMUs), and machine learning for human intent recognition in health-related areas has grown considerably. However, there is limited research exploring how IMU quantity and pla…
View article: Estimating Compressive and Shear Forces at L5-S1: Exploring the Effects of Load Weight, Asymmetry, and Height Using Optical and Inertial Motion Capture Systems
Estimating Compressive and Shear Forces at L5-S1: Exploring the Effects of Load Weight, Asymmetry, and Height Using Optical and Inertial Motion Capture Systems Open
This study assesses the agreement of compressive and shear force estimates at the L5-S1 joint using inertial motion capture (IMC) within a musculoskeletal simulation model during manual lifting tasks, compared against a top-down optical mo…
View article: Drift-Free Joint Angle Calculation Using Inertial Measurement Units without Magnetometers: An Exploration of Sensor Fusion Methods for the Elbow and Wrist
Drift-Free Joint Angle Calculation Using Inertial Measurement Units without Magnetometers: An Exploration of Sensor Fusion Methods for the Elbow and Wrist Open
Joint angles of the lower extremities have been calculated using gyroscope and accelerometer measurements from inertial measurement units (IMUs) without sensor drift by leveraging kinematic constraints. However, it is unknown whether these…
View article: Gyroscope Vector Magnitude: A proposed measure for accurately measuring angular velocities
Gyroscope Vector Magnitude: A proposed measure for accurately measuring angular velocities Open
High movement velocities are among the primary risk factors for work-related musculoskeletal disorders (MSDs). Ergonomists have commonly used two methods to calculate angular movement velocities of the upper arms using inertial measurement…
View article: Reliability Analysis of Observation-Based Exposure Assessment Tools for the Upper Extremities: A Systematic Review
Reliability Analysis of Observation-Based Exposure Assessment Tools for the Upper Extremities: A Systematic Review Open
(1) Background: The objectives of this systematic review were to (i) summarize the results of studies evaluating the reliability of observational ergonomics exposure assessment tools addressing exposure to physical risk factors associated …
View article: Validation of Fatigue Failure Risk Assessment Tools Against Physician-Diagnosed Outcomes
Validation of Fatigue Failure Risk Assessment Tools Against Physician-Diagnosed Outcomes Open
Evidence suggests that musculoskeletal disorders (MSDs) may be the result of a fatigue failure process in musculoskeletal tissues. Recently risk assessment tools using fatigue failure principles have been developed to evaluate risk of low …
View article: An ergonomic assessment tool for evaluating the effect of back exoskeletons on injury risk
An ergonomic assessment tool for evaluating the effect of back exoskeletons on injury risk Open
Low back disorders (LBDs) are a leading injury in the workplace. Back exoskeletons (exos) are wearable assist devices that complement traditional ergonomic controls and reduce LBD risks by alleviating musculoskeletal overexertion. However,…
View article: EMG and Joint Angle-Based Machine Learning to Predict Future Joint Angles at the Knee
EMG and Joint Angle-Based Machine Learning to Predict Future Joint Angles at the Knee Open
Electromyography (EMG) is commonly used to measure electrical activity of the skeletal muscles. As exoskeleton technology advances, these signals may be used to predict human intent for control purposes. This study used an artificial neura…
View article: Evidence-Based Strategies for Improving Occupational Safety and Health Among Teleworkers During and After the Coronavirus Pandemic
Evidence-Based Strategies for Improving Occupational Safety and Health Among Teleworkers During and After the Coronavirus Pandemic Open
Objective To review practical, evidence-based strategies that may be implemented to promote teleworker safety, health, and well-being during and after the coronavirus pandemic of 2019 (COVID-19). Background The prevalence of telework has i…
View article: Biomechanical factors during common agricultural activities: Results of on-farm exposure assessments using direct measurement methods
Biomechanical factors during common agricultural activities: Results of on-farm exposure assessments using direct measurement methods Open
Agricultural work is associated with increased risk of adverse musculoskeletal health outcomes. The purpose of this study was to quantify exposure to biomechanical factors among a sample (n = 55) of farmers in the Midwest region of the U.S…
View article: Job rotation and work-related musculoskeletal disorders: a fatigue-failure perspective
Job rotation and work-related musculoskeletal disorders: a fatigue-failure perspective Open
Job rotation is an organisational strategy that can be used, in part, to reduce occupational exposure to physical risk factors associated with work-related musculoskeletal disorders (MSDs). Recent studies, however, suggest that job rotatio…
View article: Measuring the Effect of Tool Design on Exposure to Physical Risk Factors among Novice Hand Planters
Measuring the Effect of Tool Design on Exposure to Physical Risk Factors among Novice Hand Planters Open
The majority of reforestation in the southeastern United States is achieved using hand planting methods. Previous research suggests a high prevalence of musculoskeletal pain and other symptoms among hand planters as a result of exposure to…
View article: Whole-Body Vibration and Trunk Posture During Operation of Agricultural Machinery
Whole-Body Vibration and Trunk Posture During Operation of Agricultural Machinery Open
Exposure to whole-body vibration (WBV) is common among agricultural workers and is associated with musculoskeletal health outcomes such as low back pain. Little is known, however, about the characteristics of exposure experienced during ac…
View article: Digital Human Modeling in the Occupational Safety and Health Process: An Application in Manufacturing
Digital Human Modeling in the Occupational Safety and Health Process: An Application in Manufacturing Open
Digital human modeling (DHM) and simulation software has been identified as an effective tool for evaluating work tasks and design alternatives without requiring the expense of physical mock-ups and production trials. Despite recent commer…
View article: Barriers to the Adoption of Wearable Sensors in the Workplace: A Survey of Occupational Safety and Health Professionals
Barriers to the Adoption of Wearable Sensors in the Workplace: A Survey of Occupational Safety and Health Professionals Open
Objective: To gather information on the (a) types of wearable sensors, particularly personal activity monitors, currently used by occupational safety and health (OSH) professionals; (b) potential benefits of using such technologies in the …
View article: Effects of Movement Speed and Magnetic Disturbance on the Accuracy of Inertial Measurement Units
Effects of Movement Speed and Magnetic Disturbance on the Accuracy of Inertial Measurement Units Open
This study evaluated the effects of motion speed and magnetic disturbance on the spatial orientation accuracy of an inertial measurement unit (IMU) on the hand. Thirteen participants performed six trials of a repetitive material transfer t…