A Study of Optimal Handle Shape and Muscle Strength Distribution on Lower Arm When Holding a Foil

2009 ◽  
Vol 108 (2) ◽  
pp. 524-530 ◽  
Author(s):  
Chih-Lin Chang ◽  
Kai-Way Li ◽  
Fang-Tsan Lin ◽  
Yung-Tsan Jou ◽  
Chuen-Der Huang
Keyword(s):  
Strength Distribution ◽  
Muscle Group ◽  
Mean Square ◽  
Cumulative Trauma ◽  
Trauma Symptoms ◽  
Long Duration ◽  
Flexor Carpi Ulnaris ◽  
Muscle Groups ◽  
Electromyographic Signals ◽  
Extensor Carpi Radialis

The strength of five working muscle groups of the lower arms of 8 male fencers, including adductor pollicis, extensor carpi radialis, flexor carpi radialis, extensor carpi ulnaris, and flexor carpi ulnaris, were examined during competition. Root mean square values of muscular electromyographic signals indicated that the shape of foil handles significantly influenced distribution of working strength of each muscle group. Use of the Pistol-Viscounti type of foil handle showed better distribution of strength among the 5 muscle groups than did other types of foils. Using the Pistol-Viscounti foil handle not only reduced muscular fatigue but also lessened cumulative trauma symptoms while holding a foil for a long duration.

Evaluation of proprioception in denervated and healthy wrist joints

2020 ◽  
Vol 45 (4) ◽  
pp. 408-413
Author(s):  
Susanne Rein ◽  
Jochen Winter ◽  
Thomas Kremer ◽  
Frank Siemers ◽  
Ursula Range ◽  
...  
Keyword(s):  
Neuromuscular Control ◽  
Position Sense ◽  
Joint Position Sense ◽  
Joint Position ◽  
Flexor Carpi Ulnaris ◽  
Proprioceptive Deficit ◽  
Extensor Carpi Radialis ◽  
Wrist Denervation ◽  
Force Sense ◽  
Reflex Time

We recruited 25 patients after complete wrist denervation and 60 healthy adults to investigate conscious and unconscious proprioception of the wrist. Ipsi- and contralateral joint-position sense, force sense, and wrist reflexes were measured. The latter were triggered by a trapdoor, recording electromyographic signals from the extensor carpi radialis brevis, extensor carpi ulnaris, flexor carpi radialis, and flexor carpi ulnaris muscles. No significant differences were found for joint position sense, force sense, and wrist reflexes between both groups, except for reflex time of the flexor carpi ulnaris after denervation of the left wrist as compared with the left flexor carpi ulnaris in controls or in right operated wrists. At a mean follow-up of 32 months (range 8 to 133), we found no proprioceptive deficit of the conscious proprioceptive qualities of joint position sense, force sense, and the unconscious proprioceptive neuromuscular control of wrist reflex time for most muscles after complete wrist denervation. We conclude from this study that complete wrist denervation does not affect the proprioceptive senses of joint position, force sense, and reflex time of the wrist.

Perceived Exertion in Isometric Muscular Contractions Related to Age, Muscle, Force Level and Duration

1992 ◽  
Vol 36 (10) ◽  
pp. 712-716 ◽  
Author(s):  
Joseph M. Deeb ◽  
Colin G. Drury
Keyword(s):  
Perceived Exertion ◽  
Muscle Force ◽  
Age Groups ◽  
Muscle Group ◽  
Isometric Contractions ◽  
Age Group ◽  
Perceived Effort ◽  
Muscle Groups ◽  
Different Levels

This research was concerned with studying the development and growth of perceived effort of long-term isometric contractions as a function of muscle group (biceps vs quadriceps), of subjects with different age groups (20–29 vs. 50–59 years old) on long-term muscular isometric contractions (5 minutes) at different levels of %MVC (20, 40, 60, 80 and 100 %MVC). An experiment testing 20 subjects each performing 10 conditions (two muscle groups × five levels of %MVC) showed that the older age group reported Significantly higher perceived exertion at higher levels of %MVC and across time. Furthermore, subjects experienced a higher and faster increase in their perceived exertion when the level of %MVC and time increased.

Positive Caregiving Styles Attenuating Effects of Cumulative Trauma Among Youth Who Commit Sexual Crimes

2020 ◽  
pp. 0306624X2095239
Author(s):  
Jamie Yoder ◽  
Adam Brown ◽  
Melissa Grady ◽  
Rebecca Dillard ◽  
Natalie Kennedy
Keyword(s):  
Parenting Styles ◽  
Traumatic Experiences ◽  
Cumulative Trauma ◽  
Trauma Symptoms ◽  
Significant Group ◽  
Sexual Crimes ◽  
Trauma Symptom ◽  
Maternal Caregiving ◽  
Positive Caregiving ◽  
Trauma Symptomatology

Among youth who commit sexual crimes, childhood trauma experiences have been linked to a host of outcomes including trauma symptom expression. Furthermore, research has begun assessing differential rates of cumulative adverse childhood experiences (ACEs) between youth who commit sexual and non-sexual crimes. Yet, few studies have comparatively examined rates of cumulative traumatic events using more robust measures of adversity. There is scant research on outcomes associated cumulative trauma among youth who commit sexual crimes including linkages to trauma symptoms and how positive parenting styles (PCSs) can attenuate in this relationship. This study aims to compare cumulative trauma experiences between youth who commit sexual ( n = 112) and non-sexual crimes ( n = 224). Among youth who commit sexual crimes, we test how PCSs mitigate or moderate the effects of cumulative trauma on trauma symptoms. Results from independent samples t-tests revealed significant group differences on singular and cumulative traumatic experiences, and trauma symptomatology, where youth who commit sexual crimes had higher rates of all. Stepwise linear regressions revealed mitigating effects of maternal PCSs and tests of moderation revealed main and interaction effects, where intermediate positive maternal caregiving styles for youth with higher cumulative trauma were associated with greater trauma symptomatology. Implications and limitations are discussed.

scholarly journals A Novel Grip-Type Microsurgical Needle Holder: Introduction and Electromyographic Evaluation

2020 ◽  
Vol 05 (02) ◽  
pp. e50-e56
Author(s):  
Yoshichika Yasunaga ◽  
Daisuke Yanagisawa ◽  
Erika Ohata ◽  
Shunsuke Yuzuriha ◽  
Shoji Kondoh ◽  
...  
Keyword(s):  
Surface Electromyography ◽  
Index Finger ◽  
Mean Square ◽  
Microvascular Anastomosis ◽  
Needle Holder ◽  
Muscle Movement ◽  
Type Device ◽  
Flexor Carpi Ulnaris ◽  
Forearm Muscle ◽  
Finger Replantation

Abstract Background We have newly developed a novel “grip-type” gun-shaped microsurgical needle holder that requires only finger twisting between the thumb and index finger for needle advancement. This study aimed to objectively assess whether this grip-type needle holder could reduce forearm muscle movement during microsurgical suturing as compared with a conventional pen-type needle holder by means of surface electromyography (sEMG). Methods Extensor carpi ulnaris (ECU) muscle and flexor carpi ulnaris muscle (FCU) sEMG measurements were taken during needle advancement in a microvascular anastomosis model for calculation of root mean square (RMS) values. The summed ECU and FCU RMS values were employed as indicators of forearm muscle movement and compared between the pen-type and grip-type instruments. Analyses of eight subjects and suturing in five directions by one subject were conducted. Results The summed ECU and FCU RMS values of the grip-type holder were significantly smaller than those of the pen-type holder in comparisons of eight subjects (p < 0.05). Similarly, the summed RMS values of the grip-type holder in each of the five suturing directions were remarkably lower than those of the pen-type holder. Conclusion The grip-type needle holder could significantly reduce forearm muscle movement as compared with a conventional pen-type holder based on objective sEMG measurements. The grip-type device appears more ideally suited for delicate microsurgical suturing, such as lymphaticovenular anastomosis or finger replantation, since the reduced forearm movement may mitigate the risk of coarse motion and hand shaking.

scholarly journals Median to radial nerve transfer after traumatic radial nerve avulsion in a pediatric patient

2019 ◽  
Vol 24 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Ellen L. Larson ◽  
Katherine B. Santosa ◽  
Susan E. Mackinnon ◽  
Alison K. Snyder-Warwick
Keyword(s):  
Pediatric Patient ◽  
Radial Nerve ◽  
Sensory Nerve ◽  
Nerve Transfer ◽  
Orthopedic Procedures ◽  
Pronator Teres ◽  
Nerve Transfers ◽  
Muscle Groups ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis

This case report describes an isolated radial nerve avulsion in a pediatric patient, treated by combination sensory and motor median to radial nerve transfers. After traumatic avulsion of the proximal radial nerve, a 12-year-old male patient underwent end-to-end transfer of median nerve branches to flexor carpi radialis and flexor digitorum superficialis to the posterior interosseous nerve and extensor carpi radialis nerve, respectively. He underwent end-to-side sensory transfer of the superficial radial sensory to the median sensory nerve. Pronator teres to extensor carpi radialis brevis tendon transfer was simultaneously performed to power short-term wrist extension. Within months after surgery, the patient had regained 9–10/10 sensation in the hand and forearm. In the following months and years, he regained dexterity, independent fine-finger and thumb motions, and 4–5/5 strength in all extensors except the abductor pollicis longus muscle. He grew 25 cm without extremity deformity or need for secondary orthopedic procedures. In appropriate adult and pediatric patients with proximal radial nerve injuries, nerve transfers have advantages over tendon transfers, including restored independent fine finger motions, regained sensation, and reinnervation of multiple muscle groups with minimal donor sacrifice.

Magnitude and Reliability of Measurements of Muscle Strength across Trials for Individuals with Mental Retardation

1993 ◽  
Vol 77 (2) ◽  
pp. 643-649 ◽  
Author(s):  
Michael Horvat ◽  
Ron Croce ◽  
Glenn Roswal
Keyword(s):  
Mental Retardation ◽  
Muscle Strength ◽  
Muscle Group ◽  
Extensor Muscle ◽  
Reliable Measure ◽  
Muscle Groups ◽  
Sufficient Magnitude ◽  
Individuals With Mental Retardation

The purpose of this investigation was to examine the magnitude and reliability of strength measures on the Nicholas Manual Muscle Tester for individuals with mental retardation. 17 subjects were given six trials with the dominant and nondominant flexor and extensor muscle groups. No significant differences were found between dominant and nondominant muscle groups by side or by muscle group. Interclass correlations ranged from .96 to .98 for six and three trials, respectively. It was concluded that the test was appropriate for reliably assessing strength in this population and that these individuals can achieve a sufficient magnitude on three trials for a reliable measure of strength.

MUSCLE GROWTH AND DISTRIBUTION IN SWINE AS INFLUENCED BY LIVEWEIGHT, BREED, SEX AND RATION

1971 ◽  
Vol 51 (1) ◽  
pp. 41-49 ◽  
Author(s):  
R. J. RICHMOND ◽  
R. T. BERG
Keyword(s):  
Muscle Growth ◽  
Growth Patterns ◽  
Muscle Group ◽  
Low Energy ◽  
Limb Muscle ◽  
Thoracic Limb ◽  
Yorkshire Pigs ◽  
Spinal Group ◽  
Muscle Groups ◽  
Total Muscle

Muscle distribution was studied in 109 Duroc × Yorkshire, Hampshire × Yorkshire and Yorkshire × Yorkshire barrows and gilts fed either high or low energy rations (3652 and 2757 kcal DE/kg, containing 19.9% and 15.3% protein, respectively) and slaughtered at 23, 68, 91 or 114 kg liveweight. Individually dissected muscles from half carcasses were grouped into nine "standard muscle groups" and expressed as percentages of total side muscle. Slight changes occurred in muscle distribution between 23 and 68 kg liveweight, but remained quite constant thereafter. Breed groups were quite similar except that Duroc × Yorkshire pigs had a significantly greater percentage of muscle in the spinal group. The influence of sex appeared to vary relative to liveweight, with gilts maturing at earlier weights than barrows. Ration influence was negligible except for the distal thoracic limb group, which had a slightly greater percentage of muscle in pigs on the HE ration than the LE ration. Unexplained interactions between sex and ration and sex and breed effects occurred for the thorax to thoracic limb muscle group. Comparisons of the present pig data with those from cattle indicated that, in pigs, diphasic growth patterns may not be as pronounced as in cattle, and that individual muscles may be growing proportionate to total muscle very early in life. There seemed to be little evidence to indicate that selection pressures have had any influence on changing the muscle distribution in swine.

Chemical fat in the musculature of the sheep carcass

1973 ◽  
Vol 80 (2) ◽  
pp. 219-224 ◽  
Author(s):  
W. J. Pryor ◽  
G. H. Warren
Keyword(s):  
Hind Limb ◽  
Dry Matter ◽  
Mean Value ◽  
Fat Content ◽  
Muscle Group ◽  
Intercostal Muscle ◽  
Merino Sheep ◽  
Acid Lactone ◽  
The Mean ◽  
Muscle Groups

SummaryForty merino sheep of mixed ages including lambs, ewes, wethers and rams were slaughtered and dissected. The chemical fat content often muscle groups in each sheep was measured directly and the mean value for the musculature of the whole carcass calculated.A characteristic pattern of chemical fat deposition was shown with the intercostal muscle group and the abdominal group being consistently highest in fat content, the shin and hind-limb muscles lowest and other intermediate. The pattern of growth of intramviscular fat was consistent with differences in activity of the muscle groups in the maintenance of posture. It was postulated that variations in fat content in muscle groups are affected by differences in blood flow.A highly significant relationship was established between dry matter and chemical fat content for each of the muscle groups. The regression was characteristic for each muscle group, and differed for most groups.Regressions between individual muscle group fat and that of total musculature fat revealed that no group was consistently the best predictor of the total carcass musculature fat though there was considerable difference between the groups. It was concluded there is no group which could be used for prediction purposes commercially.In a group of 14 other ewes subjected to weight loss up to 30%, and half of which were implanted with resorcylic acid lactone, no discernible effects on muscle group fat content were revealed.

scholarly journals Біоморфологічні особливості м’язів, діючих на плечовий суглоб, деяких представників ряду горобцеподібних – Ordо Passeriformes

2017 ◽  
Vol 19 (77) ◽  
pp. 55-59
Author(s):  
O.O. Melnyk ◽  
M.V. Melnyk
Keyword(s):  
Shoulder Joint ◽  
Elbow Joint ◽  
Muscle Development ◽  
Physical Exertion ◽  
Shoulder Girdle ◽  
Muscle Group ◽  
National University ◽  
Muscle Groups ◽  
Shoulder Girdle Muscles ◽  
Fixation Points

Biomorphological features of muscles that act on the shoulder joint of some representatives of orderPasseriformes are represented in the article. As shoulder joint of birds has many axes, not only the muscles of the shoulder joint provide the movements in it, but some of the muscles of the shoulder girdle and elbow joint. It should be noted that the main flight muscles of birds are the shoulder girdle muscles, including the chest (m. pectoralis) and supra-coracoid muscles. Some muscles of an elbow joint, including m. coracoradialis and m. scapuli triceps, are equally important. However, the amount of muscles that somehow act on the shoulder joint of the investigated birds' species is different, the degree of muscle development in these species is also different. In order to understand the degree of development, particularly mechanisms of differentiation and development of muscle structures, a comprehensive study of the muscles of the shoulder girdle, shoulder and elbow joints was conducted. The material for the research was obtained from the funds of the Department of animal anatomy named after acad. V.G. Kasyanenko of National University of Life and Environmental Sciences of Ukraine, where the studies of muscular structures of the shoulder joint of some representatives of order Passeriformes, including raven (Corvus corax), rook (Corvus fragilegus), waxwings (Bombycilla garrulous), were conducted. Research of muscles of the shoulder joint, shoulder girdle and elbow joint of birds was performed on fresh or fixed in 10% formalin solution cadavers. After describing and defining of fixation points of the muscles, they were dissected to determine the location of the muscle fibers. In addition, in order to determine the degree of development of muscles and muscle groups, each muscle was weighed. During the research, muscles were drawn or pictured to complement the work with illustrative material. There was no larger or smaller muscle neither in muscle group of shoulder, nor elbow joint that should be significantly for each case. There is no clear stability in the development of muscle groups of these joints. At the same time, muscle group of elbow joint is more developed than the muscle group of shoulder joint. All these mentioned features of structure and differentiation of muscles, which act on the shoulder joint of birds, are caused by physical exertion, posed by adaptation to a different type, speed and duration of flight.

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