Surveillance
Laboratory Investigations
Biomechanical Modeling
Clinical Studies
Gallagher, S., Marras, W.S., Litsky, A.S., Burr, D., Landoll, J, and Matkovic, V., (2007) “A Comparison of Fatigue Failure Responses of Old Versus Middle-Aged Lumbar Motion Segments in Simulated Flexed Lifting,” Spine, 32(8).
Hou, Y., Aurada, JM, Karwowski, W, Marras, W.S., and Davis, K. (2007) “Estimation of the Dynamic Spinal Forces Using A Recurrent Fuzzy Neural Network” IEEE Transactions on Systems, Man, and Cybrenetics – Part B: Cybrenetics, 37(1), 100-109.
Theado, E.W., Knapik, G.G., and Marras, W.S. (2007) “Modification of an EMG-assisted biomechanical model for pushing and pulling,” International Journal of Industrial Ergonomics,37(11-12), 825-831.
Karwowski, W., Gaweda, A., Marras, W.S., Davis, K., Zurada, J.M. and Rodrick, D. (2006) “A Fuzzy Relational Rule Network Modeling of Electromyographical Activity of Trunk Muscles in Manual Lifting Based on Trunk Angles, Moments, Pelvic Tilt and Rotation Angels.” International Journal of Industrial Ergonomics, 36, 847-859.
Gallagher, S., Marras, W.S., Litsky, A.S., Burr, D. (2006) "An Exploratory Study of Loading and Morphometric Factors Associated With Specific Failure Modes in Fatigue Testing of Lumbar Motion Segments." Clinical Biomechanics,21, 228-234.
Campbell-Kyureghyan, N., Marras, W.S., Burr, D., and Jorgensen, M.J. (2005) "The Prediction of Lumbar Spine Geometry: Method Development and Validation." Clinical Biomechanics, 20(455-464).
Gallagher, S., Marras, W.S., Litsky, A.S., and Burr, D. (2005) "Torso flexion loads and the fatigue failure of human lumbrosacral motion segments." Spine, 30(20) 2265-2273.
Jorgensen, M.J., Marras, W.S., Smith, F.W., and M.H. Pope (2004) “Sagittal Plane Moment Arms of the Female Lumbar Region Rectus Abdominis in an Upright Neutral Torso Posture," Clinical Biomechanics, 20(3) 242-246.
Jorgensen, M.J., Marras, W.S., Gupta, P., and Waters, T.R. (2003) “Sagittal Plane Moment-Arms of the Male and Female Lumbar Erector Spinae as a Function of Torso Flexion”. The Spine Journal, 3(5), 363-369.
Jorgensen, M.J., Marras, W.S., Gupta, P., and Waters, T.R. (2003) “Cross-sectional area of the lumbar back muscles as a function of torso flexion”. Clinical Biomechanics, 18(4), 280-286.
Lee, W., Karwowski, W., Marras, W.S., and Rodrick, D. (2003) “A Neuro-Fuzzy Modeling of Myoelectrical Activity of Trunk Muscles Due to Manual Lifting Tasks”, Ergonomics, 46(1-3), 285-309.
Marras, W.S., Jorgensen, M.J., Granata, K.P., and Wiand, B. (2001) "Female and Male Trunk Geometry: Size and Prediction of the Spine Loading Trunk Muscles Derived from MRI," Clinical Biomechanics, 16(1), 38-46.
Parnianpour, M., Ghosh, K., Barin, K., and Marras, W.S. (2001) “Quantification of Trunk Motion in Response to Complex Platform Perturbations while Holding Weights in an Upright Posture”, Biomedical Engineering, Applications, Basis and Communications, 13(1): 33-46.
Marras, W.S., Davis, K.G., and A.B. Maronitis (2001) "A Non-MVC EMG Normalization Technique for the Trunk Musculature: Part 2. Validation and Use to Predict Spinal Loads," Journal of Electromyography and Kinesiology, 11(1), 11-18.
Marras, W.S. and Davis, K.G. (2001) "A Non-MVC EMG Normalization Technique for the Trunk Musculature: Part 1. Method Development," Journal of Electromyography and Kinesiology, 11(1), 1-9.
Jorgensen, M.J., Marras, W.S., Granata, K.P., and Wiand, B. (2001) "MRI-Derived Moment-Arms of the Female and Male Spine Loading Muscles," Clinical Biomechanics, 16(3), 182-193.
Marras, W.S., Jorgensen, M.J., Granta, K.P., and Wiand, B. (2000) "Female and Male Trunk Geometry, Size and Prediction of the Spine Loading Muscles Derived from MRI," Clinical Biomechanics, 16(1), 38-46.
Nelson, J.E., Treaster, D.E., and Marras, W.S. (2000) "Finger Motion, Wrist Motion, and Tendon Travel as A Function of Keyboard Angles," Clinical Biomechanics, 15(7), 489-498.
Marras, W.S., Allread, W.G., Burr, D.L., and Fathallah, F.A. (2000) "Validation of a Low Back Disorder Risk Model: A Prospective Study of Ergonomic Interventions Associated with Manual Materials Handling Jobs," Ergonomics, 43(11), 1866-1886.
Fahallah, F.A., Marras, W.S., and Parianpour, M. (1999) "Regression Models for Predicting Peak and Continuous Three-Dimensional Spinal Loads During Symmetric and Asymmetric Lifting Tasks," Human Factors, 41(3), 373-388
Marras, W.S., Granata, K.P. and Davis, K.G. (1999) "Variability in Spine Loading Model Performance," Clinical Biomechanics, 14(8), 505-514.
Marras, W.S., Davis, K.G., and Granata, K.P. (1998) "Trunk Muscle
Activities During Asymmetric Twisting Motions," Journal of Electromyography
and Kinesiology, 8(4), 247-256.
Sparto, P.J., Parnianpour, M., Marras, W.S., Granata, K.P., Reinsel, T.E.,
Simon, S.R. (1998) "The Effect Of EMG-Force Relationships And Method
Of Gain Estimation On The Predictions Of An EMG-Driven Model Of Spinal
Loading," Spine, 23(4), 423-429.
Fathallah, F.A., Marras, W.S., and Parnianpour, M. (1998) "An Assessment of Complex Spinal Loads During Dynamic Lifting Tasks," Spine, 23(6), 706-716.
Marras, W.S., and Granata, K.P. (1997) "An EMG-Assisted Model of Trunk Lateral Bending," Journal of Biomechanics, 30(7), 697-703.
Marras, W. S. Granata, K. P. (1997) "Spine loading during trunk lateral bending motions" Journal of Biomechanics, 30(7), 697-703.
Marras, W.S., and Granata, K.P. (1997) "The Development Of An EMG-Assisted Model To Assess Spine Loading During Whole-body Free-Dynamic Lifting," Journal of Electromyography and Kinesiology, 7(4), 259-268.
Fathallah, F.A., Marras, W.S., Parnianpour, M., and Granata, K.P. (1997) "A Method For Measuring External Spinal Loads During Unconstrained Free-Dynamic Lifting," Journal of Biomechanics, 30(9), 975-978.
Sparto, P.J., Parnianpour, M., Marras, W.S., Granata, K.P., Reinsel, T.E., and Simon, S.R. (1997) "Neuromuscular Trunk Performance And Spinal Loading During A Fatiguing Isometric Trunk Extension With Varying Torque Requirements," Journal of Spinal Disorders, 10(2), 145-156.
Kim, J.Y., Parnianpour, M., and Marras, W.S. (1996) "Quantitative Assessment Of The Control Capability Of The Trunk Muscles During Oscillatory Bending Motion Under A New Experimental Protocol," Clinical Biomechanics, 11(7), 385-391.
Granata, K.P., and Marras, W.S. (1995) "An EMG-Assisted Model of Trunk Loading During Free-Dynamic Lifting," Journal of Biomechanics, 28(11), 1309-1317.
Marras, W.S., and Granata, K.P. (1995) "A Biomechanical Assessment and Model of Axial Twisting in the Thoraco-Lumbar Spine," Spine, 20(13), 1440-1451.
Fathallah, F.A., Marras, W.S., and Wright, L.P. (1995) " Trunk Muscle and Intra-Abdominal Pressure Behavior During Trunk Axial Twisting Motions," Journal of Bioengineering, (in review).
Marras, W.S., Parnianpour, M. Kim, J.Y., Ferguson, S.A., Crowell, R.R, and Simon, S.R. (1994) "A Normal Database of Dynamic Trunk Motion Characteristics During Repetitive Trunk Flexion and Extension as A Function of Task Asymmetry, Age and Gender," IEEE Transactions, 2(3), 137-146.
Schoenmarklin, R.W., Marras, W.S., and Leurgans S.E. (1994) "Industrial Wrist Motions and Risk of Cumulative Trauma Disorders in Industry," Ergonomics, 37(9), 1449-1459.
Gallagher, S., Hamrick, C.A., Love, A.C., and Marras, W.S. (1994) "Dynamic Biomechanical Modeling of Symmetric and Asymmetric Lifting Tasks in Restricted Postures," Ergonomics, 37(8), 1289-1310.
Lavender, S.A., Marras, W.S., and Miller, R.A. (1993) "The Development
of Preparatory Response Strategies in Anticipation of Sudden Loading to
the Torso," Spine, 18(14), 2097-2105.
Marras, W.S., and Mirka, G.A. (1993) "Electromyographic Studies of
the Lumbar Trunk Musculature During the Generation of Low Level Trunk
Acceleration," Journal of Orthopaedic Research, 11(6), 811-817.
Mirka G.A., and Marras, W.S. (1993) "A Stochastic Model of Trunk Muscle Activities During Trunk Bending," Spine, Volvo Award for Low Back Pain Research, 18(11), 1396-1409.
Granata, G.P., and Marras, W.S. (1993) "An EMG-Assisted Model of Loads on the Lumbar Spine During Asymmetric Trunk Extensions," Journal of Biomechanics, 26(12), 1429-1438.
Ferguson, S.A., and Marras, W.S. (1992) "Quantification of Velocity Coupling During Asymmetric Lifting," International Journal of Industrial Ergonomics, 10, 207-215.
Marras, W.S. (1991) "A Model for the Objective Assessment of Automobile Restraint Systems," International Journal of Industrial Ergonomics, 8(1), 59-65.
Marras, W.S., and Sommerich, C.M. (1991) "A Three Dimensional Motion Model of Loads on the Lumbar Spine, Part I: Model Structure," Human Factors, 33(2), 123-137.
Marras, W.S., and Sommerich, C.M. (1991) "A Three Dimensional Motion Model of Loads on the Lumbar Spine, Part II: Model Validation," Human Factors, 33(2), 139-149.
Mirka, G.A., and Marras, W.S. (1990)"Lumbar Motion Response to a Constant Load Velocity Lift," Human Factors, 32(4), 493-501.
Marras, W.S., and Mirka, G.A. (1990) "Trunk Responses to Asymmetric Acceleration," Journal of Orthopaedic Research, 8(6), 824-832.
Kroemer, K.H.E., Marras, W.S., McGlothlin, J.D., McIntyre, D.R., and M. Nordin (1990) "On the Measurement of Human Strength," International Journal of Industrial Ergonomics, 6, 199-210.
Reilly, C.H., and Marras, W.S. (1989) "SIMULIFT: A Simulation Model of Human Trunk Motion During Lifting," Spine, 14(1), 5-11.
Marras, W.S., and Reilly, C.H. (1988) "Networks of Internal Trunk Loading Activities Under Controlled Trunk Motion Conditions," Spine, 13(6), 661-667.
Marras, W.S. (1988) "Predictions of Forces Acting Upon the Lumbar Spine Under Isometric and Isokinetic Conditions: A Model-Experiment Comparison," International Journal of Industrial Ergonomics, 3(1), 19-27.
Marras, W.S., Joynt, R.L., and King, A.I. (1985) "The Force Velocity Relation and Intra-Abdominal Pressure During Lifting Activities," Ergonomics, 23(3), 603-613.
Kroemer, K.H.E. and W.S. Marras (1980) "Towards an Objective Assessment of the Maximal Voluntary Contractin Component in Routine Muscle Strength Measurements," European Journal of Applied Physiology, 45, 1-9.
