Search

Your search keyword '"Kersh M.E."' showing total 7 results
Start Over Author "Kersh M.E."
7 results on '"Kersh M.E."'

1. Effects of a 12-Month Supervised, Community-Based, Multimodal Exercise Program Followed by a 6-Month Research-to-Practice Transition on Bone Mineral Density, Trabecular Microarchitecture, and Physical Function in Older Adults: A Randomized Controlled Trial.

Author

Daly R.M., Sanders K.M., Hill K., Nowson C.A., Krug R., Ebeling P.R., Bailey C.A., Kersh M.E., Gianoudis J., Daly R.M., Sanders K.M., Hill K., Nowson C.A., Krug R., Ebeling P.R., Bailey C.A., Kersh M.E., and Gianoudis J.

Abstract

Multicomponent exercise programs are recommended to reduce fracture risk; however, their effectiveness in real-world community settings remain uncertain. This 18-month randomized controlled trial investigated the effects of a 12-month, community-based, supervised multicomponent exercise program followed by a 6-month "research-to-practice" transition on areal bone mineral density (BMD), trabecular bone microarchitecture, functional performance, and falls in older adults at increased fracture risk. One-hundred and sixty-two adults aged >=60 years with osteopenia or at increased falls risk were randomized to the Osteo-cise: Strong Bones for Life multicomponent exercise program (n = 81) or a control group (n = 81). Exercise consisted of progressive resistance, weight-bearing impact, and balance training (3-days/week) performed at community leisure centers. Overall 148 (91%) participants completed the trial, and mean exercise adherence was 59% after 12 months and 45% during the final 6 months. After 12 months, there were significant net beneficial effects of exercise on lumbar spine and femoral neck BMD (1.0% to 1.1%, p < 0.05), muscle strength (10% to 13%, p < 0.05), and physical function (timed stair climb 5%; four-square step test 6%; sit-to-stand 16%, p ranging <0.05 to <0.001), which persisted after the 6-month transition. There were no significant effects of the 18-month intervention on distal femur or proximal tibia trabecular bone microarchitecture or falls incidence, but per protocol analysis (>=66% exercise adherence) revealed there was a significant net benefit of exercise (mean [95% confidence interval] 2.8% [0.2, 5,4]) on proximal tibia trabecular bone volume fraction (Osteo-cise 1.5% [-1.2, 4.2]; controls -1.3% [-2.6, 0.1]) after 18 months due to changes in trabecular number (Osteo-cise 1.7% [-0.9, 4.3]; controls -1.1% [-2.4, 0.2]) but not trabecular thickness (Osteo-cise - 0.2% [-0.5, 0.2]; controls -0.2% [-0.4, 0.0]). In conclusion, this study supports th

Published
2020

5. How do I solve thee? Let me count the ways!

Author

Kersh, M.E. and McDonald, J.

Subjects
*MATHEMATICS education
Abstract

Describes a three-step problem-solving model based on George Polya's four-step process for teaching problem solving in elementary mathematics. Activities to promote understanding the problem; Activities to promote making a plan and solving the problem; Activities to promote reflecting on the problem-solving process.

Published
1991
Full Text
View/download PDF

7. The relationship between tibiofemoral geometry and musculoskeletal function during normal activity

Author

Michele Conconi, Karen J. Reynolds, Marcus G. Pandy, Vincenzo Parenti-Castelli, Nicola Sancisi, Saulo Martelli, Mariana E. Kersh, Martelli S., Sancisi N., Conconi M., Pandy M.G., Kersh M.E., Parenti-Castelli V., and Reynolds K.J.

Subjects
Male, medicine.medical_specialty, Knee Joint, Movement, Biophysics, Motion (geometry), Geometry, Kinematics, Walking, 03 medical and health sciences, 0302 clinical medicine, Gait (human), medicine, Humans, Orthopedics and Sports Medicine, Muscle force, Femur, Muscle, Skeletal, Gait, Mathematics, Aged, Tibia, Physical activity, Rehabilitation, Knee geometry, Biomechanics, Anatomical scaling, 030229 sport sciences, Middle Aged, Biomechanical Phenomena, medicine.anatomical_structure, Reaction, Orthopedic surgery, Female, Ankle, Musculoskeletal function, 030217 neurology & neurosurgery
Abstract

Background The effect of tibiofemoral geometry on musculoskeletal function is important to movement biomechanics. Research question We hypothesised that tibiofemoral geometry determines tibiofemoral motion and musculoskeletal function. We then aimed at 1) modelling tibiofemoral motion during normal activity as a function of tibiofemoral geometry in healthy adults; and 2) quantifying the effect of tibiofemoral geometry on musculoskeletal function. Methods We used motion data for six activity types and CT images of the knee from 12 healthy adults. Geometrical variation of the tibia and femoral articular surfaces were measured in the CT images. The geometry-based tibiofemoral motion was calculated by fitting a parallel mechanism to geometrical variation in the cohort. Matched musculoskeletal models embedding the geometry-based tibiofemoral joint motion and a common generic tibiofemoral motion of reference were generated and used to calculate joint angles, net joint moments, muscle and joint forces for the six activities analysed. The tibiofemoral model was validated against bi-planar fluoroscopy measurements for walking for all the six planes of motion. The effect of tibiofemoral geometry on musculoskeletal function was the difference between the geometry-based model and the model of reference. Results The geometry-based tibiofemoral motion described the pattern and the variation during walking for all six motion components, except the pattern of anterior tibial translation. Tibiofemoral geometry had moderate effect on cohort-averages of musculoskeletal function (R2 = 0.60–1), although its effect was high in specific instances of the model, outputs and activities analysed, reaching 2.94 BW for the ankle reaction force during stair descent. In conclusion, tibiofemoral geometry is a major determinant of tibiofemoral motion during walking. Significance Geometrical variations of the tibiofemoral joint are important for studying musculoskeletal function during normal activity in specific individuals but not for studying cohort averages of musculoskeletal function. This finding expands current knowledge of movement biomechanics.

Published
2020

Catalog

Books, media, physical & digital resources
See catalog results