نتایج جستجو برای: finger force

تعداد نتایج: 219872  

2010
Tarkeshwar Singh Varadhan SKM Vladimir M. Zatsiorsky Mark L. Latash Mark Latash

9 10 Running title: Fatigue and motor variability 11 12

Journal: :Journal of neurophysiology 2014
Derek G Kamper Heidi C Fischer Megan O Conrad Joseph D Towles William Z Rymer Kristen M Triandafilou

The purpose of this study was to investigate altered finger-thumb coupling in individuals with chronic hemiparesis poststroke. First, an external device stretched finger flexor muscles by passively rotating the metacarpophalangeal (MCP) joints. Subjects then performed isometric finger or thumb force generation. Forces/torques and electromyographic signals were recorded for both the thumb and fi...

Journal: :The journals of gerontology. Series A, Biological sciences and medical sciences 2001
V K Ranganathan V Siemionow V Sahgal J Z Liu G H Yue

BACKGROUND Aging is accompanied by a marked decline in muscle strength and ability to maintain steady submaximal force. Studies have shown that exercise programs can improve age-related regression of hand function in elderly individuals. The purpose of this study was to train elderly subjects to perform skilled finger movements and to evaluate the changes in hand function involving skillful use...

Journal: :Journal of applied physiology 2013
Tarkeshwar Singh Vladimir M Zatsiorsky Mark L Latash

We investigated the effects of fatigue produced by timed maximal voluntary contraction (MVC) of the index finger of the right hand on performance in MVC and accurate cyclic force production tasks in right-handed young (Young group) and strength-matched elderly (Elderly group) participants. We hypothesized that, before fatigue, the Elderly group would show weaker force-stabilizing synergies and ...

Journal: :Journal of applied physiology 2011
Ying Ye Michael J Griffin

Vibration of one hand reduces blood flow in the exposed hand and in the contralateral hand not exposed to vibration, but the mechanisms involved are not understood. This study investigated whether vibration-induced reductions in finger blood flow are associated with vibrotactile perception thresholds mediated by the Pacinian channel and considered sex differences in both vibration thresholds an...

2014
Derek G. Kamper Heidi C. Fischer Megan O. Conrad Joseph D. Towles William Z. Rymer Kristen M. Triandafilou Derek Kamper

38 Objective: The purpose of this study was to investigate altered finger-thumb coupling in 39 individuals with chronic hemiparesis post-stroke. 40 Methods: First, an external device stretched finger flexor muscles by passively rotating the 41 metacarpophalangeal (MCP) joints. Subjects then performed isometric finger or thumb force 42 generation. Forces/torques and electromyographic (EMG) signa...

2010
Michael Wiertlewski José Lozada Edwige Pissaloux Vincent Hayward

When a finger scans a non-smooth surface, a sensation of roughness is experienced. A similar sensation is felt when a finger is in contact with a mobile surface vibrating in the tangential direction. Since an actual finger-surface interaction results in a varying friction force, how can a measured friction force can be converted into skin relative displacement. With a bidirectional apparatus th...

Journal: :The Journal of hand surgery 1996
R L Lieber D Amiel K R Kaufman J Whitney R H Gelberman

To increase in vivo tendon force and gliding after flexor tendon repair, a variety of modifications to the methods by which protective passive motion is administered have been advocated. To determine the relationship between the prime variables, wrist and digital position, muscle activation, and in vivo tendon force, a clinically relevant canine model was developed. Force was measured in the fl...

Journal: :Motor control 2008
Stacey L Gorniak Marcos Duarte Mark L Latash

We explored possible effects of negative covariation among finger forces in multifinger accurate force production tasks on the classical Fitts's speed-accuracy trade-off. Healthy subjects performed cyclic force changes between pairs of targets "as quickly and accurately as possible." Tasks with two force amplitudes and six ratios of force amplitude to target size were performed by each of the f...

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