The Correlation between Static Muscular Force and Speed of Movement

The aim of this study was to investigate whether accommodating elastic bands with barbell back squats (BSQ) increase muscular force during the deceleration subphase. Ten healthy men (mean ± standard deviation: Age: 23 ± 2 years; height: 170.5 ± 3.7 cm; mass: 66.7 ± 5.4 kg; and BSQ one repetition maximum (RM): 105 ± 23.1 kg; BSQ 1RM/body mass: 1.6 ± 0.3) were recruited for this study. The subjects performed band-resisted parallel BSQ (accommodating elastic bands each sides of barbell) with five band conditions in random order. The duration of the deceleration subphase, mean mechanical power, and the force and velocity during the acceleration and deceleration subphases were calculated. BSQ with elastic bands elicited greater mechanical power output, velocity, and force during the deceleration subphase, in contrast to that elicited with traditional free weight (p < 0.05). BSQ with elastic bands also elicited greater mechanical power output and velocity during the acceleration subphase. However, the force output during the acceleration subphase using an elastic band was lesser than that using a traditional free weight (p < 0.05). This study suggests that BSQ with elastic band elicit greater power output during the acceleration and deceleration subphases.

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On the supposed powers of suction of common leech

Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London ◽

10.1098/rspl.1830.0116 ◽

1837 ◽

Vol 3 ◽

pp. 198-198

Keyword(s):

Muscular Force ◽

Considerable Loss

From observing the feebleness of the muscular force exhibited by the leech in its progressive movements through the water, the author was led to doubt its possessing the powers of suction that are so universally ascribed to it. A fact which came under his notice above sixty years ago, of considerable loss of blood from the leg following the bite of a vigorous leech, suggested to him the idea that the animal might become filled with blood simply by the injection of its body, in consequence of the impetus with which the blood is made to flow into it from the part bitten;—an impetus which he imagines may be occasioned by the introduction of a peculiar kind of venom. He considers the irritation which often accompanies the bite of a leech as corroborating this hypothesis: he admits, however, that the inflammation excited by the sting of a bee or a wasp is attended with effects of a totally opposite kind; for, in that case, the blood, instead of having a tendency to flow, stagnates around the point where the poison has been instilled.

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An integrated fiber-optic microfluidic device for detection of muscular force generation of microscopic nematodes

Lab on a Chip ◽

10.1039/c2lc40459a ◽

2012 ◽

Vol 12 (18) ◽

pp. 3458 ◽

Cited By ~ 14

Author(s):

Peng Liu ◽

Depeng Mao ◽

Richard J. Martin ◽

Liang Dong

Keyword(s):

Microfluidic Device ◽

Fiber Optic ◽

Force Generation ◽

Muscular Force

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Muscular Force Patterns during Level Walking in ACL-Deficient Patients with a Concomitant Medial Meniscus Tear

Applied Bionics and Biomechanics ◽

10.1155/2019/7921785 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Hongshi Huang ◽

Wei Yin ◽

Shuang Ren ◽

Yuanyuan Yu ◽

Si Zhang ◽

...

Keyword(s):

Stance Phase ◽

Medial Meniscus ◽

Rectus Femoris ◽

Cartilage Degeneration ◽

Meniscus Tear ◽

Muscular Force ◽

Acl Deficiency ◽

Level Walking ◽

Significant Difference ◽

Acl Deficient

Background. The abnormal knee joint motion patterns caused by anterior cruciate ligament (ACL) deficiency are thought to be associated with articular cartilage degeneration. High rates of meniscus tear combined with ACL rupture are observed, and these knees suffer a higher risk of early cartilage degeneration. Research Question. This study investigated lower limb muscular force patterns of ACL-deficient knees with a concomitant medial meniscus tear. Methods. 12 volunteers and 22 patients were recruited, including 12 patients with isolated ACL deficiency (ACLD) and 10 ACL-deficient patients with a concomitant medial meniscus tear (ACLDM). Level walking data at a self-selected speed were collected before surgery. Then, a musculoskeletal dynamic analysis system, AnyBody, was applied to simulate tibiofemoral flexion moments and muscle forces. Results. Our results indicate that the tibiofemoral peak flexion and extension moments in ACLDM patients are significantly lower than in controls. The rectus femoris force in ACLDM patients was significantly lower than in isolated ACL-deficient patients and the controls during mid and terminal stance phase, while no significant difference was found in hamstring and vastus force. Additionally, the gastrocnemius force in ACL-deficient patients both with and without a medial meniscus tear was lower than in controls during mid-stance phase. Significance. The ACLDM patients had lower peak tibiofemoral flexion moment, lower gastrocnemius force in mid-stance phase, and lower rectus femoris force during the mid and terminal stance phase. These results may help clinicians to better understand the muscle function and gait pattern in ACL-deficient patients with a concomitant medial meniscus tear.

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THE DECREMENT IN MUSCULAR FORCE WITH INCREASING SPEED OF SHORTENING

American Journal of Physiology-Legacy Content ◽

10.1152/ajplegacy.1934.107.3.568 ◽

1934 ◽

Vol 107 (3) ◽

pp. 568-576 ◽

Cited By ~ 9

Author(s):

H. C. Stevens ◽

R. P. Metcalf

Keyword(s):

Muscular Force ◽

Speed Of Shortening

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Tendon structure of the Caudal Fin in the Blue Sharkd, Prionace glauca

Marine and Freshwater Research ◽

10.1071/mf9920149 ◽

1992 ◽

Vol 43 (1) ◽

pp. 149

Author(s):

ED Keithan ◽

JY Ma ◽

W Rashi

Keyword(s):

Tensile Strength ◽

Quantitative Analysis ◽

Qualitative Description ◽

Nuclear Density ◽

Muscular Force ◽

Collagen Fibres ◽

Blue Shark ◽

Caudal Fin ◽

Prionace Glauca ◽

Caudal Lobe

A qualitative description of the myology of three blue shark (Prionace glauca) caudal fins is presented, forming the basis for a quantitative analysis of the tendon structure. The primary musculature consists of dorsal epaxial and ventral hypaxial portions. The average crimp angle of collagen fibres in the epaxial tendons (14.1-26.8�) is significantly greater (P<0.01) than that in the hypaxial tendons (1.8-14.5�). Similarly, epaxial tendons exhibit a significantly lower fibrocyte nuclear density (0.02- 0.03 nuclei �m-2) than do the corresponding hypaxial tendons (0.05-0.08 nuclei �m-2) (P < 0.01). The greater crimp angle and lower fibrocyte nuclear density in epaxial tendons indicate increased tensile strength, consistent with the comparatively greater muscular force required to move the upper caudal lobe.

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Assessing the Validity and Reliability of A Low-Cost Microcontroller-Based Load Cell Amplifier for Measuring Lower Limb and Upper Limb Muscular Force

Sensors ◽

10.3390/s20174999 ◽

2020 ◽

Vol 20 (17) ◽

pp. 4999

Author(s):

Julie Gaudet ◽

Grant Handrigan

Keyword(s):

Muscle Strength ◽

Upper Limb ◽

Low Cost ◽

Load Cell ◽

Manual Muscle Testing ◽

Muscular Force ◽

Validity And Reliability ◽

Important Indicator ◽

Muscle Testing ◽

Isometric Muscle

Lower and upper limb maximum muscular force development is an important indicator of physical capacity. Manual muscle testing, load cell coupled with a signal conditioner, and handheld dynamometry are three widely used techniques for measuring isometric muscle strength. Recently, there is a proliferation of low-cost tools that have potential to be used to measure muscle strength. This study examined both the criterion validity, inter-day reliability and intra-day reliability of a microcontroller-based load cell amplifier for quantifying muscle strength. To do so, a low-cost microcontroller-based load cell amplifier for measuring lower and upper limb maximal voluntary isometric muscular force was compared to a commercial grade signal conditioner and to a handheld dynamometer. The results showed that the microcontroller-based load cell amplifier correlated nearly perfectly (Pearson's R-values between 0.947 to 0.992) with the commercial signal conditioner and the handheld dynamometer, and showed good to excellent association when calculating ICC scores, with values of 0.9582 [95% C.I.: 0.9297–0.9752] for inter-day reliability and of 0.9269 [95% C.I.: 0.8909–0.9533] for session one, intra-day reliability. Such results may have implications for how the evaluation of muscle strength measurement is conducted in the future, particularly for offering a commercial-like grade quality, low cost, portable and flexible option.

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