AN ATTEMPT AT ESTIMATING EXTRAFIBER FLUID IN SMALL SKELETAL MUSCLES BY A SIMPLE PHYSICAL METHOD

1966 ◽  
Vol 44 (5) ◽  
pp. 765-775 ◽  
Author(s):  
G. Goldspink
Keyword(s):  
Skeletal Muscles ◽  
Water Deprivation ◽  
Biceps Brachii ◽  
Physical Method ◽  
Fluid Volume ◽  
Biceps Brachii Muscle ◽  
Optimum Thickness ◽  
Biceps Muscle ◽  
Considerable Decrease ◽  
Mature Mouse

Estimation of the extrafiber fluid volume in the biceps brachii muscle of the mouse was attempted by pressing the fibers into a thin layer. This caused the fluid from the spaces between the fibers to be displaced to the periphery of the fiber mass. As the thickness of the layer was known, the volume of the extrafiber fluid and the fibers was determined from their areas. The technique consisted of gently pressing the muscle between two glass plates. The thickness of the layer was controlled by plastic film spacers placed between the plates. The optimum thickness for mature mouse biceps muscle was found to be 125 μ. Measurements were carried out on muscles of different sizes, and it was found that the proportion of extrafiber fluid did not change very markedly during postembryonic growth. Investigations were also undertaken to ascertain the effects of starvation and deprivation of water. Starvation was found to increase the percentage of intrafiber water. Deprivation of water was found to result in a considerable decrease in the extrafiber fluid volume but to cause no dehydration of the fibers themselves.

Biceps Rupture in Water-related Sporting Activities

2010 ◽  
Vol 2 (2) ◽  
pp. 127-130
Author(s):  
Cheng H. Lo ◽  
Christopher Coombs ◽  
Simon N. Bell
Keyword(s):  
Biceps Brachii ◽  
Early Recognition ◽  
Biceps Brachii Muscle ◽  
Muscle Repair ◽  
Biceps Muscle ◽  
Muscle Belly ◽  
Injury Management ◽  
Muscle Rupture ◽  
Biceps Rupture ◽  
Sporting Activities

Closed traumatic disruptions of biceps brachii muscle belly are rarely seen. In this paper, we report two rare cases of biceps brachii muscle belly rupture sustained while water-skiing or wakeboarding and discuss the mechanism of injury, management and outcomes after a literature review. A review of published articles revealed only three previously reported cases of water skiing related biceps muscle rupture. It is important to be vigilant of these injuries, given that early recognition and operative intervention with or without direct muscle repair may optimise outcomes.

scholarly journals Dynamics of Сhanges in the Power Characteristics of the Biceps Brachii Muscle under the Influence of Different Vibration Effects

2021 ◽  
Vol 20 (2) ◽  
pp. 62-68
Author(s):  
Anastasia S. Trepova ◽  
Mikhail A. Eremushkin
Keyword(s):  
Muscle Strength ◽  
Vibration Frequency ◽  
Biceps Brachii ◽  
Biceps Brachii Muscle ◽  
Average Increase ◽  
Biceps Muscle ◽  
Left Hand ◽  
Power Characteristics ◽  
Vibration Therapy ◽  
The Right

Aim. To determine the effects of vibration therapy devices exposure with a constant and aperiodic frequency of vibrations on the tissue of the biceps muscle of the shoulder. Material and methods. The study was conducted on 10 volunteers aged 24-35 years. the program Adobe Audition CC 2020, the device for vibration therapy with a constant vibration frequency “Charm 1-t”, the device for vibration therapy with an aperiodic vibration frequency “Individual massager with a pseudo-boiling layer” (MI EPS), the robotic biomechanical diagnostic and training complex with biological feedback CON-TREX were used. The measurement of the maximum strength of the biceps brachii muscle was carried out once to detect sensitivity to vibration, and then during 7 days for the dynamics of power characteristics. The maximum force was measured before exposure to vibrotherapy devices and immediately after exposure using the isokinetic classical mode of operation of the diagnostic system. Results. In a single measurement of biceps strength on one shoulder in a group of women, the average increase in muscle strength after using the Charm 1-T device was 0.8 N (2.3%), after using MI EPS – 1.9 N (6.4%). In the group of men, the average increase in muscle strength after using the device “Charm 1-T” was 1.9 N (3.2%), after using “MI EPS” – 4.6 N (7.2%). At the seven-day follow-up, the average increase in strength in the group of women on the right hand after using the Charm 1-T device was 21.8% (5.6 N), on the left hand after using MI EPS, the increase was 23.2% (6.1 N). In the group of men, the average increase in strength on the right hand after using “Charm 1-T” was 53% (30.7 N), on the left hand after using “MI EPS” – 15.5% (11.5 N). Conclusion. All participants in the study groups were determined to be sensitive to both types of vibration exposure. The study participants demonstrated an increase in strength indicators when testing the biceps muscle of the shoulder, and there was also an improvement in the tolerability of the procedure itself.

scholarly journals Histochemistry profile of the biceps brachii muscle fibres of capuchin monkeys (Cebus apella, Linnaeus, 1758)

2014 ◽  
Vol 74 (3 suppl 1) ◽  
pp. S177-S183
Author(s):  
CHF Bortoluci ◽  
LH Simionato ◽  
GM Rosa Junior ◽  
JA Oliveira ◽  
JRP Lauris ◽  
...  
Keyword(s):  
Biceps Brachii ◽  
Cebus Apella ◽  
General Analysis ◽  
Capuchin Monkey ◽  
Muscle Fibres ◽  
Capuchin Monkeys ◽  
Biceps Brachii Muscle ◽  
Biceps Muscle ◽  
Fast Twitch

A general analysis of the behaviour of “Cebus” shows that when this primate moves position to feed or perform another activity, it presents different ways of locomotion. This information shows that the brachial biceps muscle of this animal is frequently used in their locomotion activities, but it should also be remembered that this muscle is also used for other development activities like hiding, searching for objects, searching out in the woods, and digging in the soil. Considering the above, it was decided to research the histoenzimologic characteristics of the brachial biceps muscle to observe whether it is better adpted to postural or phasic function. To that end, samples were taken from the superficial and deep regions, the inserts proximal (medial and lateral) and distal brachial biceps six capuchin monkeys male and adult, which were subjected to the reactions of m-ATPase, NADH-Tr. Based on the results of these reactions fibres were classified as in Fast Twitch Glycolitic (FG), Fast Twitch Oxidative Glycolitic (FOG) and Slow Twitc (SO). In general, the results, considering the muscle as a whole, show a trend of frequency FOG> FG> SO. The data on the frequency were studied on three superficial regions FOG=FG>SO; the deep regions of the inserts proximal FOG=FG=SO and inserting the distal FOG>FG=SO. In conclusion, the biceps brachii of the capuchin monkey is well adapted for both postural and phasic activities.

scholarly journals Is it the coracobrachialis superior muscle, or is it an unidentified rare variant of coracobrachialis muscle?

2021 ◽  
Author(s):  
Łukasz Olewnik ◽  
Nicol Zielinska ◽  
Łukasz Gołek ◽  
Paloma Aragonés ◽  
Jose Ramon Sanudo
Keyword(s):  
Case Report ◽  
Rare Variant ◽  
Shoulder Joint ◽  
Biceps Brachii ◽  
Coracoid Process ◽  
Biceps Brachii Muscle ◽  
Shoulder Region

AbstractThe coracobrachialis muscle (CBM) originates from the apex of the coracoid process, in common with the short head of the biceps brachii muscle, and from the intermuscular septum. The CBM demonstrates variability in both the proximal and distal attachment, with some extremely rare varieties, such as the coracobrachialis superior, coracobrachialis longus and coracocapsularis muscle. This case report describes an extremely rare variant of the coracobrachialis superior muscle, or a very rare variant of the CBM. Our findings highlight the importance of muscle variants in the shoulder region, especially the coracoid region, and are significant for radiologists, anatomists, physiotherapists and surgeons specializing in the shoulder joint.

scholarly journals Older Adults Exhibit a Reduced Ability to Fully Activate Their Biceps Brachii Muscle

1999 ◽  
Vol 54 (5) ◽  
pp. M249-M253 ◽  
Author(s):  
G. H. Yue ◽  
V. K. Ranganathan ◽  
V. Siemionow ◽  
J. Z. Liu ◽  
V. Sahgal
Keyword(s):  
Older Adults ◽  
Biceps Brachii ◽  
Biceps Brachii Muscle

scholarly journals Muscle length and joint angle influence spinal but not corticospinal excitability to the biceps brachii across forearm postures

2019 ◽  
Vol 122 (1) ◽  
pp. 413-423 ◽  
Author(s):  
Davis A. Forman ◽  
Daniel Abdel-Malek ◽  
Christopher M. F. Bunce ◽  
Michael W. R. Holmes
Keyword(s):  
Isometric Contraction ◽  
Elbow Joint ◽  
Joint Angle ◽  
Biceps Brachii ◽  
Motor Evoked Potentials ◽  
Muscle Length ◽  
Elbow Flexion ◽  
Corticospinal Excitability ◽  
Biceps Brachii Muscle ◽  
Spinal Excitability

Forearm rotation (supination/pronation) alters corticospinal excitability to the biceps brachii, but it is unclear whether corticospinal excitability is influenced by joint angle, muscle length, or both. Thus the purpose of this study was to separately examine elbow joint angle and muscle length on corticospinal excitability. Corticospinal excitability to the biceps and triceps brachii was measured using motor evoked potentials (MEPs) elicited via transcranial magnetic stimulation. Spinal excitability was measured using cervicomedullary motor evoked potentials (CMEPs) elicited via transmastoid electrical stimulation. Elbow angles were manipulated with a fixed biceps brachii muscle length (and vice versa) across five unique postures: 1) forearm neutral, elbow flexion 90°; 2) forearm supinated, elbow flexion 90°; 3) forearm pronated, elbow flexion 90°; 4) forearm supinated, elbow flexion 78°; and 5) forearm pronated, elbow flexion 113°. A musculoskeletal model determined biceps brachii muscle length for postures 1–3, and elbow joint angles ( postures 4–5) were selected to maintain biceps length across forearm orientations. MEPs and CMEPs were elicited at rest and during an isometric contraction of 10% of maximal biceps muscle activity. At rest, MEP amplitudes to the biceps were largest during supination, which was independent of elbow joint angle. CMEP amplitudes were not different when the elbow was fixed at 90° but were largest in pronation when muscle length was controlled. During an isometric contraction, there were no significant differences across forearm postures for either MEP or CMEP amplitudes. These results highlight that elbow joint angle and biceps brachii muscle length can each independently influence spinal excitability. NEW & NOTEWORTHY Changes in upper limb posture can influence the responsiveness of the central nervous system to artificial stimulations. We established a novel approach integrating neurophysiology techniques with biomechanical modeling. Through this approach, the effects of elbow joint angle and biceps brachii muscle length on corticospinal and spinal excitability were assessed. We demonstrate that spinal excitability is uniquely influenced by joint angle and muscle length, and this highlights the importance of accounting for muscle length in neurophysiological studies.

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