14 results on '"tissue loading"'
Search Results
2. Monitoring Knee Contact Force with Force-Sensing Insoles.
- Author
-
Spencer, Alex, Samaan, Michael, and Noehren, Brian
- Subjects
- *
KNEE , *PEARSON correlation (Statistics) , *WALKING speed - Abstract
Numerous applications exist for monitoring knee contact force (KCF) throughout activities of daily living. However, the ability to estimate these forces is restricted to a laboratory setting. The purposes of this study are to develop KCF metric estimation models and explore the feasibility of monitoring KCF metrics via surrogate measures derived from force-sensing insole data. Nine healthy subjects (3F, age 27 ± 5 years, mass 74.8 ± 11.8 kg, height 1.7 ± 0.08 m) walked at multiple speeds (0.8–1.6 m/s) on an instrumented treadmill. Thirteen insole force features were calculated as potential predictors of peak KCF and KCF impulse per step, estimated with musculoskeletal modeling. The error was calculated with median symmetric accuracy. Pearson product-moment correlation coefficients defined the relationship between variables. Models develop per-limb demonstrated lower prediction error than those developed per-subject (KCF impulse: 2.2% vs 3.4%; peak KCF: 3.50% vs. 6.5%, respectively). Many insole features are moderately to strongly associated with peak KCF, but not KCF impulse across the group. We present methods to directly estimate and monitor changes in KCF using instrumented insoles. Our results carry promising implications for internal tissue loads monitoring outside of a laboratory with wearable sensors. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Monitoring Knee Contact Force with Force-Sensing Insoles
- Author
-
Alex Spencer, Michael Samaan, and Brian Noehren
- Subjects
wearable ,knee contact force ,musculoskeletal modeling ,statistical modeling ,tissue loading ,Chemical technology ,TP1-1185 - Abstract
Numerous applications exist for monitoring knee contact force (KCF) throughout activities of daily living. However, the ability to estimate these forces is restricted to a laboratory setting. The purposes of this study are to develop KCF metric estimation models and explore the feasibility of monitoring KCF metrics via surrogate measures derived from force-sensing insole data. Nine healthy subjects (3F, age 27 ± 5 years, mass 74.8 ± 11.8 kg, height 1.7 ± 0.08 m) walked at multiple speeds (0.8–1.6 m/s) on an instrumented treadmill. Thirteen insole force features were calculated as potential predictors of peak KCF and KCF impulse per step, estimated with musculoskeletal modeling. The error was calculated with median symmetric accuracy. Pearson product-moment correlation coefficients defined the relationship between variables. Models develop per-limb demonstrated lower prediction error than those developed per-subject (KCF impulse: 2.2% vs 3.4%; peak KCF: 3.50% vs. 6.5%, respectively). Many insole features are moderately to strongly associated with peak KCF, but not KCF impulse across the group. We present methods to directly estimate and monitor changes in KCF using instrumented insoles. Our results carry promising implications for internal tissue loads monitoring outside of a laboratory with wearable sensors.
- Published
- 2023
- Full Text
- View/download PDF
4. Ergonomic Benefits of an Angle Grinder With Rotatable Main Handle in a Cutting Task.
- Author
-
Reinvee, Märt, Aia, Sander, and Pääsuke, Mati
- Subjects
- *
VISUAL analog scale , *FOREARM - Abstract
Objective: The aim of this study was to evaluate the ergonomic benefits of an angle grinder with a rotatable main handle in a cutting task.Background: Angle grinder manufacturers rarely address ergonomic features in their advertisements, and if they do, the benefits are expressed in a qualitative manner. Meanwhile, quantitative information about the effects of the device on the worker is required to make informed decisions during tool selection and cumulative trauma prevention.Method: Eleven maintenance workers and metalworkers used an angle grinder to cut a horizontal steel rod using three wrist postures. Only one of the postures was exclusively available in the case of a rotatable main handle. The postural effect was evaluated objectively with electromyography and a force-sensing-resistor-based force glove. Subjective ratings about discomfort and control were obtained with a visual analog scale.Results: The subjective ratings favor the near-neutral wrist posture. The forearm muscles' electromyographic activities were similar across the postures. Forces on the hand-handle interface were concentrated on the intermediate phalanges. If the device is operated without gloves, the forces on the intermediate phalanges may exceed the discomfort pressure threshold regardless of wrist posture.Conclusion: In the cutting task, the subjective measures favor the posture with a near-neutral wrist, which is a feature of the rotatable main handle. The objective measures did not allow one to prefer one posture to another.Application: The findings give insight into the impact of wrist posture on muscle activity, forces on the hand-handle interface, and discomfort. This is useful information for the person responsible for tool selection. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
5. An Upper Extremity Risk Assessment Tool Based on Material Fatigue Failure Theory: The Distal Upper Extremity Tool (DUET).
- Author
-
Gallagher, Sean, Schall, Mark C., Sesek, Richard F., Huangfu, Rong, and Schall, Mark C Jr
- Subjects
- *
MUSCULOSKELETAL system , *RISK assessment , *WORK-related injuries , *OCCUPATIONAL hazards , *LOGISTIC regression analysis , *ARM physiology , *FATIGUE (Physiology) , *KINEMATICS , *MUSCULOSKELETAL system diseases , *OCCUPATIONAL diseases , *PHYSIOLOGY - Abstract
Objective: Musculoskeletal tissues repeatedly loaded in vitro fail in accordance with material fatigue failure theory, and there is evidence to suggest that the same process occurs in vivo. The current paper presents a new upper extremity risk assessment tool, the Distal Upper Extremity Tool (DUET), predicated on material fatigue failure theory.Methods: DUET requires an estimate of force exertion level and the number of repetitions performed to derive estimates of damage and probabilities of experiencing a distal upper extremity outcome. Damage accrued over multiple tasks may be summed to estimate the cumulative damage (CD) accrued over a workday. Validation of this tool was performed using five distal upper extremity (DUE) outcomes (involving medical visits and pain) from an existing epidemiological database involving data from six automotive manufacturing plants. Logistic regression was used to assess the association of the log of the DUET CD measure to DUE outcomes.Results: Results demonstrated that the log of the DUET CD measure was highly associated with all five DUE outcomes in both crude analyses and those adjusted for site, age, gender, and body mass index ( p < .01). A model relating the continuous DUET log CD score to the probability of the DUE outcome Injury + Pain Last Year was developed, which demonstrated a significant dose-response relationship.Conclusions: Results suggest that fatigue failure-based risk assessment techniques are highly associated with DUE outcomes and provide support for the notion that an underlying fatigue failure process may be involved in the development of upper extremity musculoskeletal disorders. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
6. Total forearm support during a typing task may reduce the risk of Trapezius' Myalgia development
- Author
-
Rui José Santiago, João Santos Baptista, André Magalhães, José Torres Costa, and Repositório Científico do Instituto Politécnico do Porto
- Subjects
Job risk assessment ,sEMG ,Upper extremity ,Public Health, Environmental and Occupational Health ,Human Factors and Ergonomics ,Physical ergonomics ,Tissue loading - Abstract
Evaluate the influence of alternating the position of the upper limbs, between fully supported and unsupported forearms, in the Upper Trapezius (UT) activity during a typing task on a straight-edged desk. Ergonomic barriers, such as reduced desk area, is one of the reasons that force computer users to work without supporting their forearms. Unsupported forearms may lead to increased UT muscle fatigue, increasing the potential for lesions, with Trapezius Myalgia (TM) being a possible outcome. 15 healthy volunteers were assessed (6 females, average age of 3,7 ± 9,5 years old). The protocol included an alternated position of forearms every 5 min between fully supported and unsupported forearms, with a 20-min total duration of a typing task. Surface electromyography readings were collected from both UTs. Significant differences were found in the variation of the EMG signal between the two positions for the non-dominant arm after 10 min (p < .05) of typing. The non-dominant UT registered higher levels of activity than the dominant UT. Supported forearms reduced the electrical activity in both UTs, with a greater difference in the non-dominant. This study consolidates the current knowledge that unsupported upper limb during typing tasks significantly increases UT’s electrical activity. By fully supporting the forearm, that activity is reduced. Females and the non-dominant UT showed higher electrical activity, potentially increasing the risk of developing TM. Healthcare providers, safety and health professionals, and ergonomists should be mindful of the forearm position when advising computer users to prevent TM.
- Published
- 2023
7. The Contribution of Biomechanical-Biological Interactions of the Spine to Low Back Pain.
- Author
-
Marras, William S., Walter, Benjamin A., Purmessur, Devina, Mageswaran, Prasath, and Wiet, Matthew G.
- Subjects
- *
BACKACHE diagnosis , *BACKACHE prevention , *RISK assessment , *INDUSTRIAL safety , *INDUSTRIAL hygiene , *SPINE physiology , *KINEMATICS , *LUMBAR pain , *PHYSIOLOGY - Abstract
Objective: The objective of this mini-review is to examine a subset of literature that demonstrates multiple interactions between mechanics and biology within the spine and propose how incorporation of these mechano-biologic interactions can be applied to improve the conceptual understanding of tissue tolerances.Background: Low back pain represents a major musculoskeletal problem in the workplace. Traditional biomechanical assessments have employed tissue tolerances as an approach for reducing workplace injuries; however, development of more universal biologically sensitive tolerances requires incorporation of mechano-biologic interactions.Methods: A focused literature review addressing the interactions between mechanical loading and biology in the spine.Results: Mechanical loads applied to the body are distributed across all spatial scales from the body to the tissues to the cells. These mechanical loads regulate cellular metabolism and over time can lead to tissue strengthening or weakening. Mechanical loading also interacts with the biologic environment (e.g., tissue inflammation, nerve sensitization) to influence the perception of pain, thereby changing the risk of experiencing pain. Biologic tissues also exhibit time-dependent changes in mechanical behaviors that occur throughout the day and with disease, suggesting tissue tolerances are time dependent.Conclusion: Incorporating mechano-biologic interactions into the traditional tissue tolerance paradigm through describing tissue tolerances as a function of multiple factors (e.g., preexisting risk factors, underlying pathology, and time) may lead to the development of tissue tolerances that are more representative of the in vivo situation.Application: Efforts must work toward incorporating biological concepts into tissue tolerances in order to improve risk assessment tools. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF
8. Clinical Rationale and Rehabilitation Guidelines for Post Biologic Therapy.
- Author
-
Honbo ES, Mattfeld R, Khadavi M, and Podesta L
- Subjects
- Humans, Tendons, Biological Therapy, Platelet-Rich Plasma, Cartilage, Articular, Sports Medicine
- Abstract
The use of orthobiologic modalities such as platelet-rich plasma in orthopedics and sports medicine to deliver high concentrations of naturally occurring biologically active growth factors and proteins to the site of injury is very promising and continues to evolve. Early protection and tissue-specific progressive loading are critical components to successful outcomes following orthobiologic intervention. Each tissue heals and responds differently. Ligament, tendon, muscle, and articular cartilage each have unique healing properties that require tissue-specific loading. The authors have found using a criteria-based loading and exercise progression guided by dynamic imaging when appropriate to further advance the goal-oriented rehabilitation program. Each patient and injured tissue are unique and require specific intervention and rehabilitation., Competing Interests: Disclosure L. Podesta, MD, Editor, Biologic Orthopedic Journal E. Honbo, PT, DPT, OCS, Cert. DN, The Authors have nothing to disclose. R. Mattfeld, PT, DPT, OCS, ATC, The Authors have nothing to disclose., (Copyright © 2022 Elsevier Inc. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
9. Coronal plane socket stability during gait in persons with transfemoral amputation: Pilot study.
- Author
-
Fatone, Stefania, Dillon, Michael, Stine, Rebecca, and Tillges, Robert
- Subjects
- *
RESIDUAL limbs , *AMPUTEES , *ANALYSIS of covariance , *ANALYSIS of variance , *ARTIFICIAL limbs , *BIOMECHANICS , *CONFIDENCE intervals , *DIAGNOSIS , *DYNAMICS , *GAIT in humans , *HUMAN comfort , *KINEMATICS , *LEG amputation , *PROBABILITY theory , *PROSTHETICS , *RESEARCH funding , *SCALE analysis (Psychology) , *STATISTICS , *PILOT projects , *DATA analysis , *BODY mass index , *REPEATED measures design , *MOTION capture (Human mechanics) , *REHABILITATION - Abstract
Little research describes which transfemoral socket design features are important for coronal plane stability, socket comfort, and gait. Our study objectives were to (1) relate socket comfort during gait to a rank order of changes in ischial containment (IC) and tissue loading and (2) compare socket comfort during gait when tissue loading and IC were systematically manipulated. Six randomly assigned socket conditions (IC and tissue compression) were assessed: (1) IC and high, (2) IC and medium, (3) IC and low, (4) no IC and high, (5) no IC and medium, and (6) no IC and low. For the six subjects in this study, there was a strong negative relationship between comfort and changes in IC and tissue loading (rho = 0.89). With the ischium contained, tissue loading did not influence socket comfort (p = 0.47). With no IC, the socket was equally comfortable with high tissue loading (p = 0.36) but the medium (p = 0.04) and low (p = 0.02) tissue loading conditions decreased comfort significantly. Coronal plane hip moments, lateral trunk lean, step width, and walking speed were invariant to changes in IC and/or tissue loading. Our results suggest that in an IC socket, medial tissue loading mattered little in terms of comfort. Sockets without IC required high tissue loading to be as comfortable as those with IC, while suboptimal tissue loading compromised comfort. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
10. Physical activity and transcutaneous oxygen pressure in men with spinal cord injury.
- Author
-
Crespo-Ruiz, Beatriz, Del-Ama, Antonio J., Jiménez-Díaz, Fernando J., Morgan, Jennifer, De La Peña-González, Ana, and Gil-Agudo, Ángel M.
- Subjects
- *
CONFIDENCE intervals , *OXIMETRY , *PERFUSION , *PRESSURE , *PROBABILITY theory , *RESEARCH , *SITTING position , *SPINAL cord injuries , *STATISTICAL hypothesis testing , *T-test (Statistics) , *WHEELCHAIRS , *PULSE oximeters , *PILOT projects , *BODY mass index , *SEDENTARY lifestyles , *PHYSICAL activity , *DATA analysis software , *WEIGHT-bearing (Orthopedics) , *DESCRIPTIVE statistics , *ISCHIUM ,BEDSORE risk factors - Abstract
This pilot study proposed a method for assessing the status of vascular flow measured by transcutaneous oxygen pressure (TcPO2) in the area of the ischium in people with spinal cord injury (SCI). In a sample of 38 men (two groups: 12 physically active and 26 sedentary) with thoracic SCI, the distribution of the physiological response of the tissues under load during sitting was assessed through analysis of ischium TcPO2 values obtained by an oximeter. TcPO2 baseline, recovery time of TcPO2 after sitting (Trec), the percentage of TcPO2 (%TcPO2) of maximum pressure TcPO2, and mechanic maximal pressure (Pmax) were evaluated. Trec in the physically active group was significantly lower (p < 0.05) than in the sedentary group. Likewise, significant differences in %TcPO2 between groups (p < 0.05) were also found. We concluded that the physiological response of the tissues under an individual with SCI's own weight resulting from prolonged sitting is better in those who are physically active. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
11. Assessing evidence supporting redistribution of pressure for pressure ulcer prevention: A review.
- Author
-
Sprigle, Stephen and Sonenblum, Sharon
- Subjects
- *
BEDSORES prevention , *ANIMAL experimentation , *PRESSURE ulcers , *DISABILITY chairs , *HEMODYNAMICS , *ERGONOMICS , *PATIENT positioning , *PERFUSION , *POSTURE , *PRESSURE , *REHABILITATION research , *RISK assessment , *SPINAL cord injuries , *WHEELCHAIRS , *EVIDENCE-based medicine , *PROFESSIONAL practice - Abstract
The formation and underlying causes of pressure ulcers (PUs) are quite complex, with multiple influencing factors. However, by definition pressure ulcers cannot form without loading, or pressure, on tissue. Clinical interventions typically target the magnitude and/or duration of loading. Pressure magnitude is managed by the selection of support surfaces and postural supports as well as body posture on supporting surfaces. Duration is addressed via turning and weight shifting frequency as well as with the use of dynamic surfaces that actively redistribute pressure on the body surfaces. This article shows that preventative interventions must be targeted to both magnitude and duration and addresses the rationale behind several common clinical interventions-some with more scientific evidence than others. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
12. Comparison of Tissue Loading Before and After the Creation of a Continuous Density Gradient in Porcine Islet Purification
- Author
-
Miyagi-Shiohira, Chika, Nakashima, Yoshiki, Ebi, Nana, Hamada, Eri, Tamaki, Yoshihito, Kuwae, Kazuho, Kobayashi, Naoya, Saitoh, Issei, Watanabe, Masami, Kinjo, Takao, Noguchi, Hirofumi, Miyagi-Shiohira, Chika, Nakashima, Yoshiki, Ebi, Nana, Hamada, Eri, Tamaki, Yoshihito, Kuwae, Kazuho, Kobayashi, Naoya, Saitoh, Issei, Watanabe, Masami, Kinjo, Takao, and Noguchi, Hirofumi
- Abstract
The purification step is one of the most important and difficult procedures in islet isolation for pancreatic islet transplantation. We previously reported that a purification method using large plastic bottles effectively achieved a high yield of islets from the porcine pancreas. In this study, we evaluated the impact of the timing of tissue loading on porcine islet purification using large plastic bottles. One method involved loading digested tissue after creating a continuous density gradient (tissue after gradient [TAG]). The other method involved loading digested tissue before creating a continuous density gradient (tissue before gradient [TBG]). There were no significant differences between TAG and TBG in terms of the islet yield, rates of viability and purity, score, and in the stimulation index after purification. Furthermore, there were no marked differences in the attainability or suitability of post-transplantation normoglycemia. Our study shows the equivalency of these two methods of islet purification.
- Published
- 2018
13. Comparison of Tissue Loading Before and After the Creation of a Continuous Density Gradient in Porcine Islet Purification
- Author
-
Chika Miyagi-Shiohira, Naoya Kobayashi, Nana Ebi, Eri Hamada, Hirofumi Noguchi, Masami Watanabe, Yoshihito Tamaki, Takao Kinjo, Yoshiki Nakashima, Issei Saitoh, and Kazuho Kuwae
- Subjects
0301 basic medicine ,endocrine system ,geography ,Continuous density ,geography.geographical_feature_category ,Chromatography ,JSOPMB special issue ,endocrine system diseases ,Chemistry ,Porcine islets ,islet transplantation ,bottle purification ,islet purification ,Islet ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,tissue loading ,islet isolation ,General Earth and Planetary Sciences ,Pancreatic islet transplantation ,Porcine pancreas ,Purification methods ,030217 neurology & neurosurgery ,General Environmental Science - Abstract
The purification step is one of the most important and difficult procedures in islet isolation for pancreatic islet transplantation. We previously reported that a purification method using large plastic bottles effectively achieved a high yield of islets from the porcine pancreas. In this study, we evaluated the impact of the timing of tissue loading on porcine islet purification using large plastic bottles. One method involved loading digested tissue after creating a continuous density gradient (tissue after gradient [TAG]). The other method involved loading digested tissue before creating a continuous density gradient (tissue before gradient [TBG]). There were no significant differences between TAG and TBG in terms of the islet yield, rates of viability and purity, score, and in the stimulation index after purification. Furthermore, there were no marked differences in the attainability or suitability of post-transplantation normoglycemia. Our study shows the equivalency of these two methods of islet purification.
- Published
- 2018
14. Comparison of Tissue Loading Before and After the Creation of a Continuous Density Gradient in Porcine Islet Purification.
- Author
-
Miyagi-Shiohira C, Nakashima Y, Ebi N, Hamada E, Tamaki Y, Kuwae K, Kobayashi N, Saitoh I, Watanabe M, Kinjo T, and Noguchi H
- Abstract
The purification step is one of the most important and difficult procedures in islet isolation for pancreatic islet transplantation. We previously reported that a purification method using large plastic bottles effectively achieved a high yield of islets from the porcine pancreas. In this study, we evaluated the impact of the timing of tissue loading on porcine islet purification using large plastic bottles. One method involved loading digested tissue after creating a continuous density gradient (tissue after gradient [TAG]). The other method involved loading digested tissue before creating a continuous density gradient (tissue before gradient [TBG]). There were no significant differences between TAG and TBG in terms of the islet yield, rates of viability and purity, score, and in the stimulation index after purification. Furthermore, there were no marked differences in the attainability or suitability of post-transplantation normoglycemia. Our study shows the equivalency of these two methods of islet purification., Competing Interests: Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2018.)
- Published
- 2018
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.