Noninvasive analysis of fascicle curvature and mechanical hardness in calf muscle during contraction and relaxation

2009 ◽  
Vol 14 (3) ◽  
pp. 264-269 ◽  
Author(s):  
Hsing-Kuo Wang ◽  
Yu-Kuang Wu ◽  
Kwan-Hwa Lin ◽  
Tzyy-Yuang Shiang
Keyword(s):  
Calf Muscle ◽  
Mechanical Hardness ◽  
Noninvasive Analysis ◽  
Contraction And Relaxation ◽  
Fascicle Curvature

Effect of gaiters on muscle pump activity in healthy volunteers

2012 ◽  
Vol 28 (6) ◽  
pp. 293-298
Author(s):  
H IWata ◽  
M Hirai ◽  
K Miyazaki ◽  
A Koyama ◽  
K Ikeda ◽  
...  
Keyword(s):  
Muscle Contraction ◽  
Healthy Volunteers ◽  
Pressure Difference ◽  
Femoral Vein ◽  
Calf Muscle ◽  
Muscle Pump ◽  
Calf Muscle Pump ◽  
Pump Activity ◽  
Elastic Stockings ◽  
Contraction And Relaxation

Objectives: Exercise of the leg with external limb compression has been reported to be useful for preventing and reducing leg oedema. The aim of this study was to investigate the effects of leg gaiters on calf muscle pump activity. Methods: Continuous measurements of the interface pressure at the leg during exercise and determination of the femoral venous velocity at the groin during exercise were carried out in healthy volunteers with elastic stockings alone, leg gaiters alone and gaiters over the elastic stockings. Results: The greatest pressure difference between muscle contraction and relaxation during exercise was observed when gaiters were applied over the elastic stockings at the calf. Gaiters alone without elastic stockings led to a significantly greater pressure difference between muscle contraction and relaxation during exercise than elastic stockings alone (P, 0.01). A significantly higher value of the peak flow velocity of the femoral vein was observed with the combined use of gaiters and elastic stockings than the single use of elastic stockings. Conclusions: Leg gaiters have a beneficial effect of augmenting venous femoral blood flow during calf muscle pump activity in volunteers with a normal valve function of leg veins.

Comparison of Regeneration Effects of Direct and Alternating Microcurrent Therapy on Atrophied Calf Muscle in a Rabbit

Clinical Pain ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 80-89
Author(s):  
Dong Han Kim ◽  
Dong Rak Kwon ◽  
Yong Suk Moon
Keyword(s):  
Calf Muscle

scholarly journals Reduced Achilles Tendon Stiffness Disrupts Calf Muscle Neuromechanics in Elderly Gait

Gerontology ◽  
2021 ◽  
pp. 1-11
Author(s):  
Rebecca L. Krupenevich ◽  
Owen N. Beck ◽  
Gregory S. Sawicki ◽  
Jason R. Franz
Keyword(s):  
Older Adults ◽  
Achilles Tendon ◽  
Metabolic Cost ◽  
Calf Muscle ◽  
Metabolic Energy ◽  
Joint Work ◽  
Tendon Stiffness ◽  
Age Related ◽  
Ankle Muscle ◽  
Metabolic Energy Expenditure

Older adults walk slower and with a higher metabolic energy expenditure than younger adults. In this review, we explore the hypothesis that age-related declines in Achilles tendon stiffness increase the metabolic cost of walking due to less economical calf muscle contractions and increased proximal joint work. This viewpoint may motivate interventions to restore ankle muscle-tendon stiffness, improve walking mechanics, and reduce metabolic cost in older adults.

scholarly journals Individual stiffness optimization of dorsal leaf spring ankle–foot orthoses in people with calf muscle weakness is superior to standard bodyweight-based recommendations

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Niels F. J. Waterval ◽  
Merel-Anne Brehm ◽  
Jaap Harlaar ◽  
Frans Nollet
Keyword(s):  
Muscle Weakness ◽  
Energy Cost ◽  
Activity Level ◽  
Calf Muscle ◽  
Leaf Spring ◽  
Foot Orthoses ◽  
Ankle Foot Orthoses ◽  
The Individual ◽  
Optimal Stiffness ◽  
Walking Energy Cost

Abstract Background In people with calf muscle weakness, the stiffness of dorsal leaf spring ankle–foot orthoses (DLS-AFO) needs to be individualized to maximize its effect on walking. Orthotic suppliers may recommend a certain stiffness based on body weight and activity level. However, it is unknown whether these recommendations are sufficient to yield the optimal stiffness for the individual. Therefore, we assessed whether the stiffness following the supplier’s recommendation of the Carbon Ankle7 (CA7) dorsal leaf matched the experimentally optimized AFO stiffness. Methods Thirty-four persons with calf muscle weakness were included and provided a new DLS-AFO of which the stiffness could be varied by changing the CA7® (Ottobock, Duderstadt, Germany) dorsal leaf. For five different stiffness levels, including the supplier recommended stiffness, gait biomechanics, walking energy cost and speed were assessed. Based on these measures, the individual experimentally optimal AFO stiffness was selected. Results In only 8 of 34 (23%) participants, the supplier recommended stiffness matched the experimentally optimized AFO stiffness, the latter being on average 1.2 ± 1.3 Nm/degree more flexible. The DLS-AFO with an experimentally optimized stiffness resulted in a significantly lower walking energy cost (− 0.21 ± 0.26 J/kg/m, p < 0.001) and a higher speed (+ 0.02 m/s, p = 0.003). Additionally, a larger ankle range of motion (+ 1.3 ± 0.3 degrees, p < 0.001) and higher ankle power (+ 0.16 ± 0.04 W/kg, p < 0.001) were found with the experimentally optimized stiffness compared to the supplier recommended stiffness. Conclusions In people with calf muscle weakness, current supplier’s recommendations for the CA7 stiffness level result in the provision of DLS-AFOs that are too stiff and only achieve 80% of the reduction in energy cost achieved with an individual optimized stiffness. It is recommended to experimentally optimize the CA7 stiffness in people with calf muscle weakness in order to maximize treatment outcomes. Trial registration Nederlands Trial Register 5170. Registration date: May 7th 2015. http://www.trialregister.nl/trialreg/admin/rctview.asp?TC=5170.

scholarly journals Tart Cherry (Fruit of Prunus cerasus) Concentrated Powder (TCcp) Ameliorates Glucocorticoid-Induced Muscular Atrophy in Mice

Medicina ◽  
2021 ◽  
Vol 57 (5) ◽  
pp. 485
Author(s):  
Sae-Kwang Ku ◽  
Jong-Min Lim ◽  
Hyung-Rae Cho ◽  
Khawaja Muhammad Imran Bashir ◽  
Young Suk Kim ◽  
...  
Keyword(s):  
Gastrocnemius Muscle ◽  
Muscular Atrophy ◽  
Muscle Protein ◽  
Oral Treatment ◽  
Calf Muscle ◽  
Prunus Cerasus ◽  
Tart Cherry ◽  
Muscle Weight ◽  
Beneficial Effects ◽  
Antioxidant Defense Systems

Background and Objectives: The present study investigated the beneficial effects of tart cherry (fruit of Prunus cerasus) concentrated powder (TCcp) on glucocorticoid (GLU)-induced catabolic muscular atrophy in the skeletal muscle of mice. Furthermore, its potential mechanism was also studied. Materials and Methods: Changes in calf thickness, calf muscle weight, calf muscle strength, body weight, gastrocnemius muscle histology, immunohistochemistry, serum creatinine, creatine kinase, lactate dehydrogenase, and antioxidant defense systems were measured. Malondialdehyde, reactive oxygen species, glutathione content, catalase, and superoxide dismutase activities in the gastrocnemius muscle, and muscle-specific mRNA expressions were evaluated. Results: After 24 days, GLU control mice showed muscular atrophy at all criteria of indexes. The muscular atrophy symptoms were significantly inhibited by oral treatment with 250 mg/kg and 500 mg/kg of TCcp through antioxidative and anti-inflammatory modulated expression of genes involved in muscle protein degradation (myostatin, atrogin-1, SIRT1, and MuRF1) and synthesis (A1R, Akt1, TRPV4, and PI3K). Conclusions: This study shows that the TCcp (500 mg/kg and 250 mg/kg) could improve muscular atrophies caused by various etiologies.

Profound Calf Muscle Dysfunction following Hip Dislocation Monitored by Air Plethysmography

2012 ◽  
Vol 36 (1) ◽  
pp. 45-46
Author(s):  
Nichole K. Baker ◽  
Amber L. Clay ◽  
Sandra L. Brown ◽  
Jonathan L. Eliason ◽  
Thomas W. Wakefield
Keyword(s):  
Hip Dislocation ◽  
Calf Muscle ◽  
Muscle Dysfunction ◽  
Air Plethysmography

scholarly journals Effects of alloimmune injury on contraction and relaxation in cultured myocytes and intact cardiac allografts

1994 ◽  
Vol 24 (7) ◽  
pp. 1769-1778 ◽  
Author(s):  
R.Douglas Ensley ◽  
Martha Ives ◽  
Liping Zhao ◽  
Mischelle McMillan ◽  
Jane Shelby ◽  
...  
Keyword(s):  
Cardiac Allografts ◽  
Contraction And Relaxation
Sign in / Sign up

Export Citation Format

Share Document