John Rasmussen

John Rasmussen
Aalborg University · Department of Materials and Production

Professor, M.Sc., Ph.D.

About

332
Publications
82,410
Reads
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4,997
Citations
Introduction
A scientist with a keen interest in innovative combinations of technologies, for instance in engineering and life sciences..
Additional affiliations
January 2001 - present
Aalborg University
Education
August 1986 - August 1989
Aalborg University
Field of study
  • Computer-Aided Design
September 1981 - June 1986
Aalborg University
Field of study
  • Mechanical Engineering
August 1978 - June 1981
Aalborghus Gymnasium
Field of study
  • Math.Phys.

Publications

Publications (332)
Article
Full-text available
Musculoskeletal disorders (MSDs) induced by industrial manual handling tasks are a major issue for workers and companies. As flexible ergonomic solutions, occupational exoskeletons can decrease critically high body stress in situations of awkward postures and motions. Biomechanical models with detailed anthropometrics and motions help us to acquire...
Article
Full-text available
Sensors with a higher sampling rate produce higher-quality data. However, for more extended periods of data acquisition, as in the continuous monitoring of patients, the handling of the generated big data becomes increasingly complicated. This study aimed to determine the validity and reliability of low-sampling-frequency accelerometer (SENS) measu...
Article
Full-text available
The use of patient-specific biomechanical models offers many opportunities in the treatment of adolescent idiopathic scoliosis, such as the design of personalized braces. The first step in the development of these patient-specific models is to fit the geometry of the torso skeleton to the patient’s anatomy. However, existing methods rely on high-qu...
Article
Background Knee osteoarthritis is a progressive disease that may require management for years before knee arthroplasty can be considered. Previously reported musculoskeletal models suggest that rebalancing the strength of the triceps surae muscles can reduce the joint loads. Methods A single patient diagnosed with mild/moderate medial left knee os...
Article
Full-text available
Patellar and Achilles tendinopathy commonly affect runners. Developing algorithms to predict cumulative force in these structures may help prevent these injuries. Importantly, such algorithms should be fueled with data that are easily accessible while completing a running session outside a biomechanical laboratory. Therefore, the main objective of...
Article
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Fusion of spinal vertebrae can be accomplished by different surgical approaches. We investigated Traditional Open Spine Surgery (TOSS) versus Minimally Invasive Spine Surgery (MISS). While TOSS sacrifices spine muscles originating or inserting on the affected vertebrae, MISS seeks to minimize the approach-related morbidity and preserve the tendon a...
Article
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Musculoskeletal multibody modeling can offer valuable insight into aetiopathogenesis behind adolescent idiopathic scoliosis, which has remained unclear. However, the underlying model should represent anatomical joints with compatible kinematic constraints while allowing the model to attain scoliotic postures. This work presents an improved and kine...
Article
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Running economy (RE) at a given submaximal running velocity is defined as oxygen consumption per minute per kg body mass. We investigated RE in a group of 12 male elite runners of national class. In addition to RE at 14 and 18 km h−1 we measured the maximal oxygen consumption (VO2max) and anthropometric measures including the moment arm of the Achi...
Article
This paper presents a knee brace design that applies an extension moment to unload the muscles in stance phase during gait, and thereby the knee, as alternative to conventional valgus braces for knee osteoarthritis patients. The concept was tested on one healthy subject during normal gait with a prototype, which was designed to activate and deactiv...
Article
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In this work, we develop and calibrate a model to represent the trajectory of a badminton shuttlecock and use it to investigate the influence of serve height in view of a new serve rule instated by the Badminton World Federation. The new rule means that all players must launch the shuttlecock below a height of 1.15 m, as opposed to the old rule whe...
Article
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This study aimed to clarify the effects of bone remodeling on biomechanical behavior in a patient with a mandibular implant-supported overdenture by comparing computed tomography-based finite element analyses (CT-FEA) with two time points of CT data. The present FEA was based on CT data collected from a 62-year-old female subject, who wore a mandib...
Article
We explore the use Fourier series to describe the kinematics of human running. From a database of 285 trials of treadmill running, we drive a musculoskeletal model with 104 anatomical joint angles to obtain kinematics. Using FFT analysis, we determine a fundamental frequency for all independent joint angles and compute average step kinematics. Fina...
Article
Passive arm-assistive devices play an important role in the rehabilitation of patients with neuromuscular disorders or injuries by overcoming their motor deficit. Routine human activities such as feeding are not possible without the aid provided by one of these devices or by a caregiver. In this study, a body-powered assistive device was designed f...
Article
Full-text available
Musculoskeletal Modeling with Jaw Motion Data from a TMD Patient Authors Ryuji Shigemitsu, Keiichi Sasaki, John Rasmussen Pages.108 - 114 DOI10.3233/ATDE200015CategoryResearch Article Abstract Temporomandibular disorder (TMD) is a prevalent dental disease in common with dental caries and periodontitis. The major symptoms of TMD are masticatory mu...
Article
Full-text available
A novel metric for the validation of musculoskeletal models is proposed, the reachable 3-D workspace (RWS). This new metric was used to compare a generic model scaled in a standard manner to a more subject-specific model. An experimental protocol for assessing the RWS was performed by ten participants for four distinct hand-payload cases. In additi...
Article
The aim of this study was to generate a subject-specific musculoskeletal muscle model, based on isometric and isovelocity measurements of the whole lower extremity. A two-step optimisation procedure is presented for optimising the muscle-tendon parameters for isometric and isovelocity joint torque profiles. A significant decrease in the differences...
Article
An experimental protocol with five tasks is proposed for a low-cost empirical assessment of the reachable 3-D workspace (RWS), including both close-to-torso and far-from-torso regions. Ten participants repeated the protocol for four distinct hand payloads. The RWS expressed as a point cloud and its non-convex alpha-shape were obtained for each case...
Article
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A novel 3-degrees-of-freedom (DOF) spherical mechanism, singularity-free in the anatomical shoulder joint workspace, is described. The use of curved scissors linkages interconnected by revolute joints, whose axes share the same remote centre-of-motion, achieves the most compact design of its kind. The kinematics of this scissors shoulder mechanism...
Chapter
This paper investigates the opportunity of predictive musculoskeletal models that do not require experimental input of kinematics and ground reaction forces. First, the requirements of such models are reviewed and, subsequently, an example model of running is derived by means of principal component analysis. The generation of different running styl...
Article
Full-text available
Mechanical devices are common treating methods for knee osteoarthritis. It has the purpose of reducing the internal joint forces and unloading the damaged structure. The reduction is often achieved by alterations in the frontal plan, shifting the contact force from one compartment to the other, leaving the total compressive force unchanged. The aim...
Article
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Introduction: People who are born with arthrogryposis multiplex congenita are typically not able to perform activities of daily living (ADL) due to decreased muscle mass, joint contractures and unnatural upper extremity positioning. They are, therefore, potential users of an assistive device capable of aiding in ADL and increasing their independen...
Article
We develop and use a numerical model to investigate the window of opportunity of free kicks in association football. The planar multibody forward dynamics model comprises a two segment leg model with joint actuations, a football, a wall and the turf. Contact mechanics is defined to model the impact of the foot and the ball’s interaction with the di...
Patent
Full-text available
The novel compact spherical joint uses spatial scissor mechanism based linkages, allowing for the design of very compact linkages and joints. The mechanism is characterized by: • Scalability and Compactness of the joint minimizing the need for space around a center of motion, and the • High degree-of-freedom to design the joint to fit a specific pu...
Article
Knowledge of the muscle, ligament and joint forces is important when planning orthopedic surgeries. Since these quantities cannot be measured in vivo under normal circumstances, the best alternative is to estimate them using musculoskeletal models. These models typically assume idealized joints, which are sufficient for general investigations but i...
Article
Full-text available
This study developed a methodology to examine the effects of grip size and grip firmness on the kinematic contribution of angular velocity (KCAV) to the generation of racket head speed during a topspin tennis forehand. The KCAV is subdivided into kinematic contribution of joint angular velocity and kinematic contribution of the body segments in the...
Chapter
Full-text available
Skeletal muscle tissue engineering holds promise for the treatment of a variety of degenerative and traumatic muscle conditions. The ultimate goal of skeletal muscle tissue engineering is very challenging, since it needs to closely reproduce a highly complex structure consisting of muscle cells, connective tissue, blood vessels, and nerves. One of...
Article
This article gives an overview of the state of the art in scaling methods of generic Hill-type muscle model parameters in view of different applications and implementation of experimental data. This article establishes the requirements used to alter a generic model toward subject-specific musculoskeletal models. This article aims to improve model t...
Article
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This paper presents a finite element model of the an kle, taking into account the effects of muscle forces, determined by a musculoskeletal analysis, to investigate the contact stress distribution in the tibio/talar joint in patients with triple arthrodesis and in normal subjects. Forces of major ankle muscles were simulated and corresponded well...
Article
This paper deals with the analysis of human arm movement in a crank-rotation task that is an example of environmentally constrained movements. Opening a door, rotating a steering wheel, and pushing a carriage are other typical examples of movements where the physical constraints, imposed on the hand position/orientation, influence the joint angles...
Article
Musculoskeletal simulations of lumbar spine loading rely on a geometrical representation of the anatomy. However, this data has an inherent inaccuracy. This study evaluates the influence of defined geometrical parameters on lumbar spine loading utilising five parametrised musculoskeletal lumbar spine models for four different postures. The influenc...
Article
The ability to predict the musculoskeletal response to external loads has multiple applications for the design of machines with a human interface and for the prediction of outcomes of musculoskeletal interventions. In this study, we applied an inverse-inverse dynamics technique to investigate its ability to predict arm posture in response to isomet...
Article
This paper presents the prediction of kinematic and kinetic patterns for human squat jumping using an optimization-based dynamic human movement prediction technique. This method enables prediction of realistic kinematics and kinetics in human squat vertical jumping including muscle and joint forces. The case of vertical jumping is selected because...
Conference Paper
Full-text available
INTRODUCTION Musculoskeletal models have been applied within multiple scientific areas such as ergonomics, sports science and orthopedics. With an increased maturation of the simulation technology, its application within clinical decision making and design of clinical products are emerging. This transition calls for patient-specific models that hav...
Article
Full-text available
An approach to the design of wearable exoskeletons on the basis of simulation of the exoskeleton and a human body model is proposed in this paper. The new approach, addressing the problem of physical human-exoskeleton interactions, models and simulates the mechanics of both the exoskeleton and the human body, which allows designers to effectively a...
Conference Paper
Although several mechanical cues are involved in the regulation of myogenic differentiation, the relevance of mechanical stimulation for muscle tissue engineering remains poorly understood. Here, we describe a novel methodology that allows imparting well-controlled mechanical stimulation patterns to cells cultured on flexible substrates, with the a...
Conference Paper
Full-text available
The muscle forces during the gait cycle can be as large as 1000N. Thus, the effect of muscle forces on the contact stress distribution might be significant. The dominant extrinsic plantar flexor is the gastrocnemius-soleus (G-S) muscle complex, and it likely has a considerable effect on the stress distribution of ankle joint in normal and abnormal...
Article
Full-text available
Subject-specific scaling of cadaver-based musculoskeletal models is important for accurate musculoskeletal analysis within multiple areas such as ergonomics, orthopaedics and occupational health. We present two procedures to scale ‘generic’ musculoskeletal models to match segment lengths and joint parameters to a specific subject and compare the re...
Article
Rule–based strength scaling is an easy, cheap and relatively accurate technique to personalise musculoskeletal models. This paper presents a new strength scaling approach for musculoskeletal models and validates it by maximal voluntary contractions. A heterogeneous group of 63 healthy subjects performed maximal isometric knee extensions. A multiple...
Article
Musculoskeletal (MS) models should be able to integrate the patient-specific MS architecture and undergo thorough validation prior to their introduction into the clinical practice. We present a streamlined methodology to develop subject-specific models able to simultaneously predict body-level dynamics, muscle forces, ligament forces, knee joint co...
Conference Paper
Full-text available
High loads can appear in the individual joints of the human foot while the driver uses the pedals, in particular, during breaking. Measuring these internal forces is very difficult or almost impossible; therefore, advanced models are necessary to perform musculoskeletal simulations. The objective of this investigation was to see what loads are acti...
Conference Paper
Full-text available
The human foot is structurally complicated and its basic load-carrying mechanisms remain a subject of debate in the biomechanics community. Several multisegment foot models have been proposed. Some of the most detailed models contain eight segments [1], but most are limited to two segments and it is unlikely that such a simplified model can accurat...
Conference Paper
Full-text available
Skeletal muscle tissue consists of a highly organized structure containing cells, connective tissue, blood vessels and innervation. Due to this complexity, engineering viable skeletal muscle still remains a major challenge. One of the first pre-requisites is to obtain cells arranged in parallel in order to efficiently produce force by contraction....
Conference Paper
Full-text available
This paper investigates the opportunity to simulate soft surfaces in rigid body inverse dynamics musculoskeletal models. More precisely, the paper addresses the change of H-point location in response to the forces produced by the body against the environment, such as pedal forces or steering forces. This situation cannot be handled by basic inverse...
Article
This paper introduces the inverse-inverse dynamics method for prediction of human movement and applies it to prediction of cycling motions. Inverse-inverse dynamics optimizes a performance criterion by variation of a parameterized movement. First, a musculoskeletal model of cycling is built in the AnyBody Modeling System (AMS). The movement is then...
Article
Full-text available
Sitting-acquired deep tissue injuries (SADTI) are the most serious type of pressure ulcers. In order to investigate the aetiology of SADTI a new approach is under development: a musculo-skeletal model which can predict forces between the chair and the human body at different seated postures. This study focuses on comparing results from a model deve...
Article
In the last two decades a steady evolution has taken place in the realm of musculoskeletal simulation, which is now taking an increasingly central role in guiding ergonomics evaluations, influencing medical device design, and informing clinical decisions. Musculoskeletal simulation holds tremendous promise to help bring safer, more innovative produ...
Article
Full-text available
Main causes for discomfort experienced by vehicle drivers during driving were investigated using a rigid-body model originally developed in the AnyBody Modeling System [. The interactions between the human body and the car-seat in various combinations of seat-pan/backrest inclinations and the effect of pedal spring stiffness were analyzed using an...
Article
This paper addresses the evaluation of clavicle fixation devices, by means of computational models. The aim was to develop a method for comparison of stress distribution in various fixation devices, to determine whether the use of multibody musculoskeletal input in such model is applicable and to report the approach. The focus was on realistic load...
Conference Paper
Full-text available
Loading conditions in the complex anatomy and physiology of the foot are often assumed due to the lack of measurements and detailed simulations. The objective of this investigation is to develop a detailed foot model to get further knowledge for loads in the foot to design better implants for soft and hard tissue defects and customized insoles to t...
Article
In clinical practice, a manual-based assessment is standard procedure to adjust the air pressure in the ROHO(®) cushion in seated position. Recently, a computerized pressure system method was developed to support the clinical adjustment of air in the ROHO(®) cushion to reduce the pressure in the seated position. To our knowledge, no studies have in...
Conference Paper
In the last two decades a steady evolution has taken place in the realm of musculoskeletal simulation, which is now taking an increasingly central role in guiding ergonomics evaluations, influencing medical device design, and informing clinical decisions. Musculoskeletal simulation holds tremendous promise to help bring safer, more innovative produ...