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Bennett HJ, Estler K, Valenzuela K, Weinhandl JT. Predicting Knee Joint Contact Forces During Normal Walking Using Kinematic Inputs With a Long-Short Term Neural Network. J Biomech Eng 2024; 146:081004. [PMID: 38270972 DOI: 10.1115/1.4064550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Accepted: 01/19/2024] [Indexed: 01/26/2024]
Abstract
Knee joint contact forces are commonly estimated via surrogate measures (i.e., external knee adduction moments or musculoskeletal modeling). Despite its capabilities, modeling is not optimal for clinicians or persons with limited experience. The purpose of this study was to design a novel prediction method for knee joint contact forces that is simplistic in terms of required inputs. This study included marker trajectories and instrumented knee forces during normal walking from the "Grand Challenge" (n = 6) and "CAMS" (n = 2) datasets. Inverse kinematics were used to derive stance phase hip (sagittal, frontal, transverse), knee (sagittal, frontal), ankle (sagittal), and trunk (frontal) kinematics. A long-short term memory network (LSTM) was created using matlab to predict medial and lateral knee force waveforms using combinations of the kinematics. The Grand Challenge and CAMS datasets trained and tested the network, respectively. Musculoskeletal modeling forces were derived using static optimization and joint reaction tools in OpenSim. Waveform accuracy was determined as the proportion of variance and root-mean-square error between network predictions and in vivo data. The LSTM network was highly accurate for medial forces (R2 = 0.77, RMSE = 0.27 BW) and required only frontal hip and knee and sagittal hip and ankle kinematics. Modeled medial force predictions were excellent (R2 = 0.77, RMSE = 0.33 BW). Lateral force predictions were poor for both methods (LSTM R2 = 0.18, RMSE = 0.08 BW; modeling R2 = 0.21, RMSE = 0.54 BW). The designed LSTM network outperformed most reports of musculoskeletal modeling, including those reached in this study, revealing knee joint forces can accurately be predicted by using only kinematic input variables.
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Affiliation(s)
- Hunter J Bennett
- Neuromechanics Laboratory, Old Dominion University, 1007 Student Recreation Center, Norfolk, VA 23529
| | - Kaileigh Estler
- Department of Kinesiology, Recreation, and Sport Studies, The University of Tennessee, Knoxville, TN 37996
- University of Tennessee at Knoxville
| | - Kevin Valenzuela
- Department of Kinesiology, California State University, Long Beach, CA 90840
| | - Joshua T Weinhandl
- Department of Kinesiology, Recreation, and Sport Studies, The University of Tennessee, Knoxville, TN 37996
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Bagwell JJ, Avila E, Reynolds N, Smith JA, Valenzuela K, Katsavelis D. Running biomechanics differ during and after pregnancy compared to females who have never been pregnant. Gait Posture 2024; 109:277-283. [PMID: 38377744 DOI: 10.1016/j.gaitpost.2024.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 01/16/2024] [Accepted: 02/03/2024] [Indexed: 02/22/2024]
Abstract
BACKGROUND Perinatal running participation has increased recently; however, pregnancy related symptoms can limit activity. Perinatal running biomechanics could inform interventions to help perinatal individuals maintain an active lifestyle. RESEARCH QUESTION Are perinatal running biomaechanics and muscle activation different compared to nulligravida females? METHODS Sixteen pregnant participants completed self-selected velocity running during second trimester (2 T), third trimester (3 T), and postpartum (PP) and 16 matched controls completed these procedures once in this case control study. Kinematic, kinetic, and electromyography (EMG) data were collected using a motion capture system, force plates, and EMG electrodes. Peak trunk, pelvis, hip, knee, and ankle kinematics and hip, knee, and ankle moments during stance phase, and average and peak erector spinae (ES), gluteus maximus (GMax), and gluteus medius (GMed) EMG amplitude and duration of activation during stance and swing phases were calculated. Independent t-tests were used to compare 2 T, 3 T, and PP to control participants (α < 0.05). RESULTS Running velocity was slower during 3 T compared to control participants. At all pregnancy timepoints compared to the control group, peak trunk contralateral rotation was smaller. During 2 T and 3 T peak hip flexor moments were smaller. At 3 T pelvis contralateral rotation was smaller, ES average amplitude was greater during swing, GMax percent duration during stance and GMed percent duration during swing were smaller. At PP trunk flexion was smaller and knee abduction was greater (all p < 0.05). CONCLUSIONS Decreased running velocity may help offset increased demand during pregnancy. During 3 T, greater ES activation, smaller trunk and pelvis motion, and altered gluteal activation could indicate trunk rigidity combined with modified hip stabilizer muscle utilization. During PP, the rigid trunk combined with greater knee abduction may indicate hip and trunk strength deficits. Altered trunk and hip motion and activation could be relevant to pathologies such as perinatal low back, pelvic girdle, or knee pain.
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Affiliation(s)
- Jennifer J Bagwell
- Department of Physical Therapy, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA.
| | - Elizabeth Avila
- Department of Kinesiology, California State University Long Beach, 1250 Bellflower Blvd, Long Beach, CA 90840, USA
| | - Nicholas Reynolds
- Department of Biomechanics, University of Nebraska, Omaha, NE 68182, 6160 University Drive, Omaha, NE 68182, USA
| | - Jo Armour Smith
- Department of Physical Therapy, Chapman University, 9401 Jeronimo Road, Irvine, CA 92618, USA
| | - Kevin Valenzuela
- Department of Kinesiology, California State University Long Beach, 1250 Bellflower Blvd, Long Beach, CA 90840, USA
| | - Dimitrios Katsavelis
- Department of Exercise Science, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA
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Elvidge T, Brown S, Valenzuela K, Sorochan J, Weinhandl JT, Zhang S. Knee and ankle biomechanics in 90° side cutting on synthetic turf with shock pad. Footwear Science 2022. [DOI: 10.1080/19424280.2022.2077842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Thomas Elvidge
- Biomechanics/Sports Medicine Lab, Department of Kinesiology, Recreation and Sport Studies, The University of Tennessee, Knoxville, TN, USA
| | - Sean Brown
- Biomechanics/Sports Medicine Lab, Department of Kinesiology, Recreation and Sport Studies, The University of Tennessee, Knoxville, TN, USA
| | - Kevin Valenzuela
- Department of Kinesiology, California State University Long Beach, Long Beach, CA, USA
| | - John Sorochan
- Department of Plant Sciences, The University of Tennessee, Knoxville, TN, USA
| | - Joshua T. Weinhandl
- Biomechanics/Sports Medicine Lab, Department of Kinesiology, Recreation and Sport Studies, The University of Tennessee, Knoxville, TN, USA
| | - Songning Zhang
- Biomechanics/Sports Medicine Lab, Department of Kinesiology, Recreation and Sport Studies, The University of Tennessee, Knoxville, TN, USA
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Durke D, Walters K, Valenzuela K, Crussemeyer J. Biomechanics And Energetics Of Curved Treadmills. Med Sci Sports Exerc 2020. [DOI: 10.1249/01.mss.0000685144.55851.5a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Valenzuela K, Zhang S. Logistic Regression Analyses Regarding Patient Dissatisfaction with Total Knee Replacement Outcomes. Med Sci Sports Exerc 2019. [DOI: 10.1249/01.mss.0000560518.07254.ef] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang S, Elvidge T, Valenzuela K. Effects of Shock Pad and Synthetic Turf on Ankle Biomechanics in a 90° Cutting Movement. Med Sci Sports Exerc 2019. [DOI: 10.1249/01.mss.0000562815.22006.d6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Oliver C, Valenzuela K, Silva H, Haro R, Cortés M, Sandoval R, Pontigo J, Álvarez C, Figueroa J, Avendaño-Herrera R, Troncoso J, Yáñez A. Effectiveness of egg yolk immunoglobulin against the intracellular salmonid pathogen Piscirickettsia salmonis. J Appl Microbiol 2015; 119:365-76. [DOI: 10.1111/jam.12857] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 05/14/2015] [Accepted: 05/18/2015] [Indexed: 11/28/2022]
Affiliation(s)
- C. Oliver
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - K. Valenzuela
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - H. Silva
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - R.E. Haro
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - M. Cortés
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - R. Sandoval
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - J.P. Pontigo
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - C. Álvarez
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
| | - J.E. Figueroa
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
- Interdisciplinary Center for Aquaculture Research (INCAR); Concepción Chile
| | - R. Avendaño-Herrera
- Interdisciplinary Center for Aquaculture Research (INCAR); Concepción Chile
- Laboratorio de Patología de Organismos Acuáticos y Biotecnología Acuícola; Departamento de Ciencias Biológicas; Facultad de Ciencias Biológicas; Universidad Andrés Bello; Viña del Mar Chile
- Centro de Investigación Marina Quintay (CIMARQ); Quintay Chile
| | | | - A.J. Yáñez
- Instituto de Bioquímica y Microbiología; Facultad de Ciencias; Universidad Austral de Chile; Valdivia Chile
- Interdisciplinary Center for Aquaculture Research (INCAR); Concepción Chile
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Yáñez AJ, Valenzuela K, Matzner C, Olavarría V, Figueroa J, Avendaño-Herrera R, Carcamo JG. Broth microdilution protocol for minimum inhibitory concentration (MIC) determinations of the intracellular salmonid pathogen Piscirickettsia salmonis to florfenicol and oxytetracycline. J Fish Dis 2014; 37:505-9. [PMID: 23803014 DOI: 10.1111/jfd.12144] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 05/07/2013] [Accepted: 05/17/2013] [Indexed: 05/12/2023]
Affiliation(s)
- A J Yáñez
- Facultad de Ciencias, Instituto de Bioquímica y Microbiología, Universidad Austral de Chile, Valdivia, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), Concepción, Chile
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Yañez AJ, Silva H, Valenzuela K, Pontigo JP, Godoy M, Troncoso J, Romero A, Figueroa J, Carcamo JG, Avendaño-Herrera R. Two novel blood-free solid media for the culture of the salmonid pathogen Piscirickettsia salmonis. J Fish Dis 2013; 36:587-591. [PMID: 23173561 DOI: 10.1111/jfd.12034] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2011] [Revised: 11/29/2011] [Accepted: 01/09/2012] [Indexed: 06/01/2023]
Affiliation(s)
- A J Yañez
- Instituto de Bioquímicay Microbiología, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile.
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Yañez AJ, Valenzuela K, Silva H, Retamales J, Romero A, Enriquez R, Figueroa J, Claude A, Gonzalez J, Avendaño-Herrera R, Carcamo JG. Broth medium for the successful culture of the fish pathogen Piscirickettsia salmonis . Dis Aquat Organ 2012; 97:197-205. [PMID: 22422090 DOI: 10.3354/dao02403] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Piscirickettsiosis or salmonid rickettsial septicaemia (SRS) caused by Piscirickettsia salmonis constitutes one of the main problems in farmed salmonid and marine fishes. Since the first reports of the disease, it has been successfully isolated and maintained in eukaryotic cell--culture systems, but these systems are time-consuming, the media are costly, and eliminating heavily contaminated host cell debris is difficult. In this report, we describe a marine-based broth supplemented with L-cysteine, named AUSTRAL-SRS broth, that facilitates superior growth of P. salmonis strains. Strains reached an optical density of approximately 1.8 when absorbance was measured at 600 nm after 6 d incubation at 18°C. Several passages (n = 6) did not alter the culture kinetics. We report for the first time the purification of DNA, lipopolysaccharide (LPS) and whole membrane protein obtained from P. salmonis grown in this liquid medium, and thus provide a suitable platform to simplify the preparation of P. salmonis cells for genetic and serological studies. Moreover, the results of the cytopathic effect test showed that P. salmonis grown in AUSTRAL-SRS broth maintained their virulence properties, inducing apoptosis after 3 d. This makes the medium a good candidate for the successful growth of P. salmonis and an excellent basis for the development of low cost vaccines.
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Affiliation(s)
- A J Yañez
- Laboratorio de Enzimología, Instituto de Bioquímica, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile.
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Valenzuela K, Raghavan S, Deymier PA, Hoying J. Formation of copper nanowires by electroless deposition using microtubules as templates. J Nanosci Nanotechnol 2008; 8:3416-3421. [PMID: 19051888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Microtubules (MTs) are self-assembling, protein-based, tubular structures several micrometers long with outer and inner diameters of 25 nm and 15 nm, respectively. This aspect ratio makes MTs ideal templates for producing nanowires for applications such as electrical nano-interconnects. MTs are poorly conductive and their use as interconnects necessitates their metallization. We report a process for metallization of MTs with copper using a biologically benign electroless deposition chemistry consisting of copper sulfate solution containing acetic acid as a complexant and ascorbic acid as reducing agent. The pH of the plating bath is controlled such that copper metallization occurs without disassembling the MTs. Electron microscopic characterization of the morphology and dimensions of the copper nanowires shows that metallization for approximately 1 minute produces a uniform nanowire with an average diameter of approximately 15 nm, suggesting that metallization is initiated selectively from the MT inner core.
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Affiliation(s)
- K Valenzuela
- Department of Materials Science and Engineering, The University of Arizona, Tucson, AZ 85721, USA
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