Search Results - "CALDWELL, Graham E"

A direct collocation framework for optimal control simulation of pedaling using OpenSim by Park, Sangsoo, Caldwell, Graham E, Umberger, Brian R

“…The direct collocation (DC) method has shown low computational costs in solving optimization problems in human movements, but it has rarely been used for…”
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A muscle control strategy to alter pedal force direction under multiple constraints: A simulation study by Park, Sangsoo, Umberger, Brian R., Caldwell, Graham E.

“…Humans can quickly adapt to different task demands in cycling. The motor system continuously manipulates applied pedal forces under the influence of…”
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Evaluation of the minimum energy hypothesis and other potential optimality criteria for human running by Miller, Ross H., Umberger, Brian R., Hamill, Joseph, Caldwell, Graham E.

“…A popular hypothesis for human running is that gait mechanics and muscular activity are optimized in order to minimize the cost of transport (CoT). Humans…”
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Muscular activity patterns in 1-legged vs. 2-legged pedaling by Park, Sangsoo, Caldwell, Graham E.

“…•Two-legged pedaling crank torque pattern altered when pedaling with 1 leg only.•Reduced downstroke crank torque led to reduced extension-related leg muscle…”
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Response to: Caution needed when interpreting muscle activity patterns during extremely low pedaling cadence by Park, Sangsoo, Caldwell, Graham E.

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Effects of Age on Mechanical Properties of Dorsiflexor and Plantarflexor Muscles by Hasson, Christopher J., Caldwell, Graham E.

“…Redundancy in the human muscular system makes it challenging to assess age-related changes in muscle mechanical properties in vivo , as ethical considerations…”
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Magnetic resonance images and measurements of the volume, proportion, and longitudinal distribution of contractile and non-contractile tissue in the dorsi- and plantar flexor muscles of healthy young and older adults by Hasson, Christopher J, Kent, Jane A, Caldwell, Graham E

“…This paper presents magnetic resonance images of the dorsi- and plantar flexor muscles for individual young and older healthy adults. Also included are…”
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Sensitivity of maximum sprinting speed to characteristic parameters of the muscle force–velocity relationship by Miller, Ross H, Umberger, Brian R, Caldwell, Graham E

“…Abstract An accumulation of evidence suggests that the force–velocity relationship (FVR) of skeletal muscle plays a major role in limiting maximum human…”
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Contractile and non-contractile tissue volume and distribution in ankle muscles of young and older adults by Hasson, Christopher J, Kent-Braun, Jane A, Caldwell, Graham E

“…Abstract Magnetic resonance imaging (MRI) enables accurate in vivo quantification of human muscle volumes, which can be used to estimate subject-specific…”
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Predicting dynamic postural instability using center of mass time-to-contact information by Hasson, Christopher J, Van Emmerik, Richard E.A, Caldwell, Graham E

“…Abstract Our purpose was to determine whether spatiotemporal measures of center of mass motion relative to the base of support boundary could predict stepping…”
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Muscle synergies are modified with improved task performance in skill learning by Park, Sangsoo, Caldwell, Graham E.

“…How do muscle synergies change as motor skills are learned? The purpose of this study was to investigate the relationship between synergy number and skill…”
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Contractile and elastic ankle joint muscular properties in young and older adults by Hasson, Christopher J, Miller, Ross H, Caldwell, Graham E

“…The purpose of this study was to investigate age-related differences in contractile and elastic properties of both dorsi- (DF) and plantarflexor (PF) muscles…”
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EMG optimization in OpenSim: A model for estimating lower back kinetics in gait by Banks, Jacob J., Umberger, Brian R., Caldwell, Graham E.

“…•Electromyography optimization was successfully implemented in OpenSim via MATLAB.•Full-body lower back musculoskeletal model appropriate for gait and carrying…”
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Biomechanical changes at the hip, knee, and ankle joints during gait are associated with knee osteoarthritis severity by Astephen, Janie L., Deluzio, Kevin J., Caldwell, Graham E., Dunbar, Michael J.

“…Mechanical factors have been implicated in the progression of knee osteoarthritis (OA). Understanding how these factors change as the condition progresses…”
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Are lower back demands reduced by improving gait symmetry in unilateral transtibial amputees? by Banks, Jacob J., Wedge, Ryan D., Caldwell, Graham E., Umberger, Brian R.

“…Gait asymmetry and a high incidence of lower back pain are typical for people with unilateral lower limb amputation. A common therapeutic objective is to…”
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Lower back kinetic demands during induced lower limb gait asymmetries by Banks, Jacob J, Umberger, Brian R, Boyer, Katherine A, Caldwell, Graham E

“…Gait asymmetries are common in many clinical populations (e.g., amputation, injury, or deformities) and are associated with a high incidence of lower back…”
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Muscle coordination in cycling: effect of surface incline and posture by Li, Li, Caldwell, Graham E

“…Biomechanics Laboratory, Department of Exercise Science, University of Massachusetts, Amherst, Amherst, Massachusetts 01003 The purpose of the present study…”
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Are psychophysically chosen lifting loads based on joint kinetics? by Banks, Jacob J., Caldwell, Graham E.

“…Tables of maximal acceptable weight limits (MAWL) are used to select safe lifting loads and help reduce workplace injuries. However, their subjective basis…”
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Gait and neuromuscular pattern changes are associated with differences in knee osteoarthritis severity levels by Astephen, Janie L, Deluzio, Kevin J, Caldwell, Graham E, Dunbar, Michael J, Hubley-Kozey, Cheryl L

“…Abstract Knee osteoarthritis (OA) is a multifactoral, progressive disease process of the musculoskeletal system. Mechanical factors have been implicated in the…”
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Limitations to maximum sprinting speed imposed by muscle mechanical properties by Miller, Ross H, Umberger, Brian R, Caldwell, Graham E

“…Abstract It has been suggested that the force–velocity relationship of skeletal muscle plays a critical limiting role in the maximum speed at which humans can…”
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