The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Joung Hwan Mun - One of the best experts on this subject based on the ideXlab platform.
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How to quantify the transition phase during golf swing performance: Torsional load affects low back complaints during the transition phase
Journal of sports sciences, 2016Co-Authors: Taeyong Sim, Ahnryul Choi, Soeun Lee, Joung Hwan MunAbstract:ABSTRACTThe transition phase of a golf swing is considered to be a decisive instant required for a powerful swing. However, at the same time, the low back Torsional Loads during this phase can have a considerable effect on golf-related low back pain (LBP). Previous efforts to quantify the transition phase were hampered by problems with accuracy due to methodological limitations. In this study, vector-coding technique (VCT) method was proposed as a comprehensive methodology to quantify the precise transition phase and examine low back Torsional load. Towards this end, transition phases were assessed using three different methods (VCT, lead hand speed and X-factor stretch) and compared; then, low back Torsional load during the transition phase was examined. As a result, the importance of accurate transition phase quantification has been documented. The largest Torsional Loads were observed in healthy professional golfers (10.23 ± 1.69 N · kg−1), followed by professional golfers with a history of LBP (7.93 ±...
Taeyong Sim - One of the best experts on this subject based on the ideXlab platform.
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How to quantify the transition phase during golf swing performance: Torsional load affects low back complaints during the transition phase
Journal of sports sciences, 2016Co-Authors: Taeyong Sim, Ahnryul Choi, Soeun Lee, Joung Hwan MunAbstract:ABSTRACTThe transition phase of a golf swing is considered to be a decisive instant required for a powerful swing. However, at the same time, the low back Torsional Loads during this phase can have a considerable effect on golf-related low back pain (LBP). Previous efforts to quantify the transition phase were hampered by problems with accuracy due to methodological limitations. In this study, vector-coding technique (VCT) method was proposed as a comprehensive methodology to quantify the precise transition phase and examine low back Torsional load. Towards this end, transition phases were assessed using three different methods (VCT, lead hand speed and X-factor stretch) and compared; then, low back Torsional load during the transition phase was examined. As a result, the importance of accurate transition phase quantification has been documented. The largest Torsional Loads were observed in healthy professional golfers (10.23 ± 1.69 N · kg−1), followed by professional golfers with a history of LBP (7.93 ±...
Victor M Goldberg - One of the best experts on this subject based on the ideXlab platform.
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Torsional Loads in the early postoperative period following total hip replacement
Journal of Orthopaedic Research, 1995Co-Authors: G M Kotzar, Dwight T Davy, J Berilla, Victor M GoldbergAbstract:Torques generated in one subject during the early postoperative period were measured with a telemeterized total hip component. The patient was examined during gait, stair ascent, rising from a chair, and single-limb stance. The torques were plotted against both the resultant joint contact force and the force component directed along the stem axis. During gait, the maximum torque was 35 Nm, recorded at a walking velocity of 1.7 m/sec. The peak torques during stair ascent and during rising from a seated position were found to be 23 and 15 Nm, respectively. The maximum value for torque measured in this study was 37 Nm during one attempt at single-limb stance. Comparison of plots for torque versus stem-axis component for the four activities shows that the torque increased more rapidly for chair exits than for gait up to resultant contact force values of as much as 1,000 N. For stair ascent, the same was true to values of 1,400 N. Within any given activity, the relationship between stem torque and resultant or stem-axis force showed considerable variability. These results indicate that experiments evaluating the stability of femoral components in total hip arthroplasty should incorporate a component directed along the stem axis, as well as a component normal to the plane of the prosthesis. The results also suggest that theoretical stress analysis models should consider the broad variability in the orientation of the joint force at the hip.
Emmanuel De Margerie - One of the best experts on this subject based on the ideXlab platform.
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Laminar bone as an adaptation to Torsional Loads in flapping flight
Journal of anatomy, 2002Co-Authors: Emmanuel De MargerieAbstract:Using a new histometric method, the orientation of primary osteons was measured in the main long bones of adult mallards (Anas platyrhynchos). In the light of previous biomechanical and ontogenetic studies, a functional hypothesis is proposed, explaining the histological differences observed between long bones; laminar bone tissue, mainly found in the wing bones, may be a biomechanical adaptation to Torsional Loads caused by flapping flight.
Ivan Argatov - One of the best experts on this subject based on the ideXlab platform.
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response of a wire rope strand to axial and Torsional Loads asymptotic modeling of the effect of interwire contact deformations
International Journal of Solids and Structures, 2011Co-Authors: Ivan ArgatovAbstract:Abstract The refined discrete mathematical model of a simple helical wire rope strand is developed. The effect of the transverse contraction of the wire strand through Poisson’s ratio and also through local contact deformations (wire flattening) has been studied in detail. In order to express the interwire contact deformation in terms of the parameters describing the strand deformation, we formulate a two-dimensional model interwire contact problem. The interwire contact interaction is treated as a frictionless unilateral plain strain problem. The nonlinear model interwire contact problem has been solved by the method of matched asymptotic expansions. The constitutive equations for a helical wire rope strand, which take into account both the Poisson’s ratio effect and the effect of contact deformation, are obtained in a closed form.
