RELATIONSHIP OF ISOKINETIC KNEE EXTENSOR STRENGTH AND CLOSED KINETIC CHAIN FUNCTIONAL ABILITY 51

1997 ◽  
Vol 29 (Supplement) ◽  
pp. 9
Author(s):  
J. E. Newberry ◽  
A. De Leon ◽  
P. J. Merriman ◽  
E. K. Castillo
Keyword(s):  
Functional Ability ◽  
Knee Extensor ◽  
Kinetic Chain ◽  
Knee Extensor Strength ◽  
Closed Kinetic Chain ◽  
Relationship Of

Effects of a Low-Intensity Strength-Training Program on Knee-Extensor Strength and Functional Ability of Frail Older People

2000 ◽  
Vol 8 (4) ◽  
pp. 325-342 ◽  
Author(s):  
Marja H. Westhoff ◽  
Lysander Stemmerik ◽  
Hendriek C. Boshuizen
Keyword(s):  
Older People ◽  
Strength Training ◽  
Training Program ◽  
Functional Ability ◽  
Knee Extensor ◽  
Knee Extensors ◽  
Control Group ◽  
Frail Older People ◽  
Low Intensity ◽  
Knee Extensor Strength

This study’s purpose was to investigate whether a 10-week low-intensity strength-training program could improve strength of the knee extensors and functional ability. Participants 65 years and older with low knee-extensor muscle strength were randomized into an exercise (n = 11) and a control group (n = 10). Knee-extensor strength and functional ability were measured before and after the program and again 6 months later. Knee-extensor strength (Nm) increased by 54% (13% in the control) by the end of the training program (F = 13.02, p = .01), and most of this improvement was still present 6 months later. The program had a beneficial effect on functional tasks, especially the time taken to rise from a chair in combination with a 3-m walk (F = 3.99, p = .03) and self-reported ability related to lower extremity performance (F = 6.97, p = .02). It seems that this program could contribute to improving functional ability in frail older people.

Relationship of The Knee Extensor Strength But Not The Quadriceps Femoris Muscularity With Sprint Performance in Sprinters: A Reexamination and Extension

2021 ◽  
Author(s):  
Miyuki Hori ◽  
Tadashi Suga ◽  
Masafumi Terada ◽  
Takahiro Tanaka ◽  
Yuki Kusagawa ◽  
...  
Keyword(s):  
Knee Extensor ◽  
Knee Extension ◽  
Quadriceps Femoris ◽  
Sprint Performance ◽  
Sprint Time ◽  
Knee Extensor Strength ◽  
Significant Difference ◽  
The Absolute ◽  
Relationship Of ◽  
The Relationship

Abstract Purpose: This study examined the relationships of the knee extensor strength and quadriceps femoris size with sprint performance in sprinters. Methods: Fifty-eight male sprinters and 40 body size-matched male non-sprinters participated in this study. The knee extensor isometric and isokinetic strengths were measured using a dynamometer. The isokinetic strength measurements were performed with slow and fast velocities at 60°/s and 180°/s, respectively. The quadriceps femoris muscle volume (MV) was measured using magnetic resonance imaging. The relative values of the knee extensor strengths and quadriceps femoris MV were normalized to body mass.Results: The absolute and relative values of the two velocity isokinetic strengths, but not of isometric strength, of the knee extension were significantly higher in sprinters than in non-sprinters (both Ps < 0.05). Such a significant difference was also observed for the relative quadriceps femoris MV (P = 0.018). In sprinters, there were significant correlations between all three knee extensor strengths and quadriceps femoris MV (r = 0.421 to 0.531, all Ps £ 0.001). The absolute and relative strengths of the fast-velocity isokinetic knee extension correlated with personal best 100-m sprint time (r = -0.477 and -0.409, respectively, both Ps £ 0.001). By contrast, no significant correlations were observed between absolute and relative quadriceps femoris MVs and personal best 100-m sprint time. Conclusions: These findings suggest that despite the presence of the relationship between muscle strength and size, the knee extensor strength may be related to superior sprint performance in sprinters independently of the quadriceps femoris muscularity.

scholarly journals The Relationship of Knee-Extensor Strength and Rate of Torque Development to Sit-to-Stand Performance in Older Adults

2013 ◽  
Vol 65 (3) ◽  
pp. 229-235 ◽  
Author(s):  
Katie Crockett ◽  
Kimberly Ardell ◽  
Marlyn Hermanson ◽  
Andrea Penner ◽  
Joel Lanovaz ◽  
...  
Keyword(s):  
Older Adults ◽  
Knee Extensor ◽  
Sit To Stand ◽  
Rate Of Torque Development ◽  
Knee Extensor Strength ◽  
Relationship Of ◽  
The Relationship ◽  
Torque Development

scholarly journals Effect of Functional Progressive Resistance Exercise on Lower Extremity Structure, Muscle Tone, Dynamic Balance and Functional Ability in Children with Spastic Cerebral Palsy

Children ◽  
2020 ◽  
Vol 7 (8) ◽  
pp. 85
Author(s):  
Hye-Jin Cho ◽  
Byoung-Hee Lee
Keyword(s):  
Cerebral Palsy ◽  
Resistance Exercise ◽  
Functional Ability ◽  
Muscle Tone ◽  
Dynamic Balance ◽  
Group Interaction ◽  
Knee Extensor ◽  
Spastic Cerebral Palsy ◽  
Significant Time ◽  
Knee Extensor Strength

The purpose of this study was to investigate the effects of functional progressive resistance exercise (FPRE) on muscle tone, dynamic balance and functional ability in children with spastic cerebral palsy. Twenty-five subjects were randomized into two groups: the FPRE group (n = 13) and the control group (n = 12). The experimental group participated in an FPRE program for 30 min per day, three times per week for six weeks. Knee extensor strength, rehabilitative ultrasound imaging (RUSI), muscle tone, dynamic balance, and functional ability was evaluated. The results showed statistically significant time × group interaction effects on the dominant side for knee extensor strength and cross-sectional area (CSA) in RUSI (p < 0.05). On both sides for thickness of the quadriceps (TQ) in RUSI, muscle tone and dynamic balance were statistically significant time × group interaction effects (p < 0.05). Additionally, knee extensor strength, CSA, TQ in RUS, muscle tone, dynamic balance and gross motor function measure (GMFM) in functional ability were significantly increased between pre- and post-intervention within the FPRE group (p < 0.05). The results suggest that FPRE is both feasible and beneficial for improving muscle tone, dynamic balance and functional ability in children with spastic cerebral palsy.

scholarly journals Relationship of the knee extensor strength but not the quadriceps femoris muscularity with sprint performance in sprinters: a reexamination and extension

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Miyuki Hori ◽  
Tadashi Suga ◽  
Masafumi Terada ◽  
Takahiro Tanaka ◽  
Yuki Kusagawa ◽  
...  
Keyword(s):  
Knee Extensor ◽  
Knee Extension ◽  
Quadriceps Femoris ◽  
Sprint Performance ◽  
Sprint Time ◽  
Knee Extensor Strength ◽  
Isokinetic Contractions ◽  
Significant Difference ◽  
Positive Correlations ◽  
Relationship Of

Abstract Purpose This study examined the relationships of knee extensor strength and quadriceps femoris size with sprint performance in sprinters. Methods Fifty-eight male sprinters and 40 body size-matched male non-sprinters participated in this study. The knee extensor isometric and isokinetic strengths were measured using a dynamometer. The isokinetic strength measurements were performed with slow and fast velocities at 60°/s and 180°/s, respectively. The quadriceps femoris muscle volume (MV) was measured using magnetic resonance imaging. The relative knee extensor strengths and quadriceps femoris MV were calculated by normalizing to body mass. Results Absolute and relative knee extensor strengths during two velocity isokinetic contractions, but not during isometric contraction, were significantly higher in sprinters than in non-sprinters (P = 0.047 to < 0.001 for all). Such a significant difference was also observed for relative quadriceps femoris MV (P = 0.018). In sprinters, there were positive correlations between all three knee extensor strengths and quadriceps femoris MV (r = 0.421 to 0.531, P = 0.001 to < 0.001 for all). The absolute and relative strengths of the fast-velocity isokinetic knee extension correlated negatively with personal best 100-m sprint time (r = −0.477 and −0.409, P = 0.001 and < 0.001, respectively). In contrast, no such significant correlations were observed between absolute and relative quadriceps femoris MVs and personal best 100-m sprint time. Conclusions These findings suggest that despite the presence of the relationship between muscle strength and size, the knee extensor strength may be related to superior sprint performance in sprinters independently of the quadriceps femoris muscularity.

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