scholarly journals Multi-Finger Interaction and Synergies in Finger Flexion and Extension Force Production

2017 ◽  
Vol 11 ◽  
Author(s):  
Jaebum Park ◽  
Dayuan Xu
Keyword(s):  
Force Production ◽  
Finger Flexion ◽  
Extension Force ◽  
Flexion And Extension

scholarly journals Relationship between finger flexion and extension force in healthy women and women with rheumatoid arthritis

2012 ◽  
Vol 44 (7) ◽  
pp. 605-608 ◽  
Author(s):  
S Brorsson ◽  
A Nilsdotter ◽  
E Pedersen ◽  
A Bremander ◽  
C Thorstensson
Keyword(s):  
Rheumatoid Arthritis ◽  
Healthy Women ◽  
Finger Flexion ◽  
Extension Force ◽  
Flexion And Extension

Hand digit control in children: age-related changes in hand digit force interactions during maximum flexion and extension force production tasks

2006 ◽  
Vol 176 (2) ◽  
pp. 374-386 ◽  
Author(s):  
Jae Kun Shim ◽  
Marcio A. Oliveira ◽  
Jeffrey Hsu ◽  
Junfeng Huang ◽  
Jaebum Park ◽  
...  
Keyword(s):  
Force Production ◽  
Maximum Flexion ◽  
Age Related ◽  
Extension Force ◽  
Flexion And Extension ◽  
Age Related Changes

Application Study on Finger Joint Motion in Rehabilitation Training

2014 ◽  
Vol 644-650 ◽  
pp. 879-883
Author(s):  
Jing Jing Yu
Keyword(s):  
Control Method ◽  
Finger Joint ◽  
Continuous Passive Motion ◽  
Joint Motion ◽  
Joint Movement ◽  
Rehabilitation Training ◽  
Angle Data ◽  
Finger Flexion ◽  
And Control ◽  
Flexion And Extension

In various forms of movement of finger rehabilitation training, Continuous Passive Motion (CPM) of single degree of freedom (1 DOF) has outstanding application value. Taking classic flexion and extension movement for instance, this study collected the joint angle data of finger flexion and extension motion by experiments and confirmed that the joint motion of finger are not independent of each other but there is certain rule. This paper studies the finger joint movement rule from qualitative and quantitative aspects, and the conclusion can guide the design of the mechanism and control method of finger rehabilitation training robot.

Limits to the Control of the Human Thumb and Fingers in Flexion and Extension

2010 ◽  
Vol 103 (1) ◽  
pp. 278-289 ◽  
Author(s):  
W. S. Yu ◽  
H. van Duinen ◽  
S. C. Gandevia
Keyword(s):  
Control System ◽  
Healthy Subjects ◽  
Neural Control ◽  
Force Production ◽  
Total Force ◽  
Neural Drive ◽  
Antagonist Muscles ◽  
Hand Performance ◽  
The Difference ◽  
Flexion And Extension

In humans, hand performance has evolved from a crude multidigit grasp to skilled individuated finger movements. However, control of the fingers is not completely independent. Although musculotendinous factors can limit independent movements, constraints in supraspinal control are more important. Most previous studies examined either flexion or extension of the digits. We studied differences in voluntary force production by the five digits, in both flexion and extension tasks. Eleven healthy subjects were instructed either to maximally flex or extend their digits, in all single- and multidigit combinations. They received visual feedback of total force produced by “instructed” digits and had to ignore “noninstructed” digits. Despite attempts to maximally flex or extend instructed digits, subjects rarely generated their “maximal” force, resulting in a “force deficit,” and produced forces with noninstructed digits (“enslavement”). Subjects performed differently in flexion and extension tasks. Enslavement was greater in extension than in flexion tasks ( P = 0.019), whereas the force deficit in multidigit tasks was smaller in extension ( P = 0.035). The difference between flexion and extension in the relationships between the enslavement and force deficit suggests a difference in balance of spillover of neural drive to agonists acting on neighboring digits and focal neural drive to antagonist muscles. An increase in drive to antagonists would lead to more individualized movements. The pattern of force production matches the daily use of the digits. These results reveal a neural control system that preferentially lifts fingers together by extension but allows an individual digit to flex so that the finger pads can explore and grasp.

Age and sex variations of the index finger flexion and extension strength in adult Bengalee population

2011 ◽  
Vol 19 (4) ◽  
pp. 265-272
Author(s):  
Sujaya De ◽  
Piyali Sengupta ◽  
Payel Maity ◽  
Amitava Pal ◽  
Prakash C. Dhara
Keyword(s):  
Index Finger ◽  
Finger Flexion ◽  
Flexion And Extension ◽  
Age And Sex

scholarly journals In vivo flexor tendon forces increase with finger and wrist flexion during active finger flexion and extension

2006 ◽  
Vol 24 (4) ◽  
pp. 763-769 ◽  
Author(s):  
Katarzyna Kursa ◽  
Lisa Lattanza ◽  
Edward Diao ◽  
David Rempel
Keyword(s):  
Flexor Tendon ◽  
Wrist Flexion ◽  
Finger Flexion ◽  
Flexion And Extension

scholarly journals Voluntary Activation and Decreased Force Production of the Quadriceps Femoris Muscle After Total Knee Arthroplasty

2003 ◽  
Vol 83 (4) ◽  
pp. 359-365 ◽  
Author(s):  
Ryan L Mizner ◽  
Jennifer E Stevens ◽  
Lynn Snyder-Mackler
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Force Production ◽  
Knee Extension ◽  
Quadriceps Femoris ◽  
Voluntary Activation ◽  
Quadriceps Femoris Muscle ◽  
Extension Force ◽  
Total Knee ◽  
Femoris Muscle

Abstract Background and Purpose. Quadriceps femoris muscle weakness as manifested by a decrease in force-generating capability is a persistent problem after total knee arthroplasty (TKA). The authors hypothesized that (1) patients with a TKA would have decreased quadriceps femoris muscle performance (weakness) and impaired volitional activation when compared with a group of older adults without knee pathology, (2) pain and age would account for a large portion of the variability in volitional activation after surgery, and (3) volitional activation in the TKA group would account for a large portion of the variability in force production. Subjects. Comparison subjects were 52 volunteers (mean age=72.2 years, SD=5.34, range=64–85). The TKA group comprised 52 patients (mean age=64.9 years, SD=7.72, range=49–78) with a diagnosis of osteoarthritis who had undergone a tricompartmental, cemented TKA. Methods. Knee extension force was measured using a burst superimposition technique, where a supramaximal burst of electrical stimulation was superimposed on a maximal voluntary isometric contraction (MVIC). The amount of failure of volitional activation is determined by the amount of electrical augmentation of force beyond a person's MVIC at the instant of the application of the electrical burst. Results. The average normalized knee extension force of the TKA group was 64% lower than that of the comparison group. The average volitional activation deficit in the TKA group (26%) was 4 times as great as the comparison group's deficit (6%). Age did not correlate with quadriceps femoris muscle activation, and knee pain explained only a small portion of the variance in knee extension force (r2=.17). Volitional activation was highly correlated with knee extension force production (r2=.65). Discussion and Conclusion. Considerable quadriceps femoris muscle inhibition after surgery has several implications for recovery. Rehabilitation programs that focus on volitional exercise alone are unlikely to overcome this pronounced failure of activation. Early interventions focused at improving quadriceps femoris muscle voluntary activation may improve efforts to restore muscle force.

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