Comparison of the kinematic parameters and electrical activity of selected muscle groups in alpine skiers exercising on two types of training platforms—Preliminary Study

2014 ◽  
Vol 39 ◽  
pp. S137-S138
Author(s):  
Wojciech Woznica ◽  
Jerzy Zawadzki
Keyword(s):  
Electrical Activity ◽  
Kinematic Parameters ◽  
Preliminary Study ◽  
Muscle Groups ◽  
Alpine Skiers

scholarly journals The Electrical Activity of the Orbicularis Oris Muscle in Children with Down Syndrome—A Preliminary Study

2021 ◽  
Vol 10 (23) ◽  
pp. 5611
Author(s):  
Liliana Szyszka-Sommerfeld ◽  
Magdalena Sycińska-Dziarnowska ◽  
Krzysztof Woźniak ◽  
Monika Machoy ◽  
Sławomir Wilczyński ◽  
...  
Keyword(s):  
Down Syndrome ◽  
Electrical Activity ◽  
Healthy Children ◽  
Exclusion Criteria ◽  
Children With Down Syndrome ◽  
Electrical Potentials ◽  
Study Results ◽  
Orbicularis Oris Muscle ◽  
Preliminary Study ◽  
Muscular Effort

The aim of this study was to assess the electrical activity of the superior (SOO) and inferior (IOO) orbicularis oris muscles in children with Down syndrome (DS) and in children without DS. After applying the inclusion and exclusion criteria, 30 subjects were eligible to participate in the later stages of the research—15 subjects with DS (mean age 10.1 ± 1.1) and 15 healthy controls (mean age 9.8 ± 1.0). The electrical potentials of the SOO and IOO muscles were recorded using a DAB-Bluetooth electromyography machine (Zebris Medical GmbH, Germany) during the following tasks: At clinical rest, saliva swallowing, lip protrusion, lip compression, and production of the syllable/pa/. The Mann–Whitney U test was conducted to compare the study results between the groups. An analysis of the electromyographical (EMG) recordings showed that the electrical activity of the orbicularis oris muscle in children with DS and lip incompetence was significantly higher compared to healthy children during saliva swallowing, lip compression, and when producing the syllable/pa/, and this may suggest greater muscular effort due to the need to seal the lips during these functional conditions.

Normal and abnormal cardiac electrical activity during aging: A preliminary study

1991 ◽  
Vol 24 (3) ◽  
pp. 282
Author(s):  
Roberta Maestri ◽  
Beatrice Aimi ◽  
Donatella Stilli ◽  
Patrizia Ciarlini ◽  
Giuseppe Regoliosi ◽  
...  
Keyword(s):  
Electrical Activity ◽  
Cardiac Electrical Activity ◽  
Preliminary Study

scholarly journals Study of the Influence of Helical Milling Parameters on the Quality of Holes in the UNS R56400 Alloy

2020 ◽  
Vol 10 (3) ◽  
pp. 845 ◽  
Author(s):  
Francisco Javier Puerta-Morales ◽  
Jorge Salguero Gomez ◽  
Severo Raul Fernandez-Vidal
Keyword(s):  
Titanium Alloy ◽  
Relevant Information ◽  
Helical Milling ◽  
Future Research ◽  
Kinematic Parameters ◽  
Hole Quality ◽  
Milling Parameters ◽  
Preliminary Study ◽  
Conventional Drilling

Helical milling has been positioned as an alternative to conventional drilling, where the advantages it offers make it very attractive for use on difficult-to-machine alloys such as the titanium alloy UNS R56400. However, the correlation between the indicator of hole quality and the kinematic parameters has rarely been studied. The kinematics are what bring most advantages and that is why it is necessary to know their influence. In this aspect, there are different focuses of problems associated with the complexity of the process kinematics, which makes it necessary to undertake a deeper analysis of the process and to carry out a preliminary study. To address this problem, a DOE (Design of Experiments) is proposed to identify the sensitivity and the main trends of the properties that define the quality holes with respect to the kinematic parameters. At the same time, a nomenclature is proposed to unify and avoid misinterpretations. This study has allowed us to obtain conclusive results that offer very relevant information for future research

Electrical activation of expiratory muscles increases with time in pentobarbital-anesthetized dogs

1992 ◽  
Vol 72 (6) ◽  
pp. 2285-2291 ◽  
Author(s):  
D. O. Warner ◽  
M. J. Joyner ◽  
K. Rehder
Keyword(s):  
Electrical Activity ◽  
Important Variable ◽  
Transversus Abdominis ◽  
Implanted Electrodes ◽  
Expiratory Muscle ◽  
Inspiratory Muscles ◽  
Anesthetized Dogs ◽  
Expiratory Muscles ◽  
Muscle Groups ◽  
Over Time

Although the pentobarbital-anesthetized dog is often used as a model in studies of respiratory muscle activity during spontaneous breathing, there is no information regarding the stability of the pattern of breathing of this model over time. The electromyograms of several inspiratory and expiratory muscle groups were measured in six dogs over a 4-h period by use of chronically implanted electrodes. Anesthesia was induced with pentobarbital sodium (25 mg/kg iv), with supplemental doses to maintain constant plasma pentobarbital concentrations. Phasic electrical activity increased over time in the triangularis sterni, transversus abdominis, and external oblique muscles (expiratory muscles). The electrical activity of the costal diaphragm, crural diaphragm, and parasternal intercostal muscles (inspiratory muscles) was unchanged. These changes in electrical activity occurred despite stable plasma levels of pentobarbital and arterial PCO2. They were associated with changes in chest wall motion and an increased tidal volume with unchanged breathing frequency. We conclude that expiratory muscle groups are selectively activated with time in pentobarbital-anesthetized dogs lying supine. Therefore the duration of anesthesia is an important variable in studies using this model.

scholarly journals Analysis of the kinematic parameters of squatting in subjects with different levels of physical activity – A preliminary study

2018 ◽  
pp. 97-105
Author(s):  
Magdalena Zawadka ◽  
Edyta Lukasik ◽  
Maria Skublewska-Paszkowska ◽  
Jakub Smolka ◽  
Piotr Gawda ◽  
...  
Keyword(s):  
Physical Activity ◽  
Kinematic Parameters ◽  
Preliminary Study ◽  
Different Levels

scholarly journals Modelling of the competitive activities of qualified female short-distance runners, taking into account their individual characteristics

2019 ◽  
Vol 23 (6) ◽  
pp. 320-326
Author(s):  
E.P. Vrublevskiy ◽  
S.V. Sevdalev ◽  
S.V. Lashkevich ◽  
A.S. Gerkusov
Keyword(s):  
Short Distance ◽  
Female Athletes ◽  
Individual Characteristics ◽  
Practical Realization ◽  
Distance Runners ◽  
Kinematic Parameters ◽  
Individual Model ◽  
Competitive Activity ◽  
Muscle Groups ◽  
Competitive Activities

Purpose: to develop an individual model of competitive activity of qualified female runners to achieve the planned sports result of 100 m. Material: for qualified athletes (n = 88), using video-computer analysis, individual characteristics of speed dynamics in running for 100m and kinematic parameters of running for different distances were recorded. The tensodynamograms of the manifestation of the strength of muscle groups carrying the main load in the structure of the sprint run of 18 short-distance runners of various qualifications were recorded and processed. Results: promising models of competitive activity in the 100m race for the planned sports result have been developed. Based on the model of a specific athlete, the main areas of work are determined, means and methods of training effects are selected. Conclusions: Practical realization of the developed model provided the necessary increase in indicators. This made it possible for female athletes (n = 8, age 19-21 years) to improve the average result in running the main distance (compared with the previous year) by 0.18 s.

Excitatory Actions of Antho-RFamide, An Anthozoan Neuropeptide, on Muscles and Conducting Systems in the Sea Anemone Calliactis Parasitica

1987 ◽  
Vol 133 (1) ◽  
pp. 157-168 ◽  
Author(s):  
I. D. McFARLANE ◽  
D. GRAFF ◽  
C. J.P. GRIMMELIKHUIJZEN
Keyword(s):  
Electrical Activity ◽  
Slow Muscle ◽  
Conduction System ◽  
Sea Anemone ◽  
Sea Anemones ◽  
Nerve Net ◽  
Direct Excitation ◽  
Calliactis Parasitica ◽  
Muscle Groups ◽  
Fast Muscles

In the sea anemone Calliactis parasitica endodermal application of the anthozoan neuropeptide Antho-RFamide (<Glu-Gly-Arg-Phe-amide), at a concentration of 10−6 or 10−7moll−1, caused a long-lasting increase in tone, contraction frequency and contraction amplitude in several slow muscle groups but had no effect on contractions in fast muscles. The effects were investigated further in isolated muscle preparations. Ectodermal application to whole animals had no effect on muscle contractions. Both ectodermal and endodermal application, at 10−7moll−1, raised electrical activity in an ectodermal conduction system, the SSI, but had no effect on an endodermal conduction system, the SS2. Electrical activity in the SS2 was increased by application at 10−6moll−1 to the endoderm but not to the ectoderm. The peptide had no effect on the through-conducting nerve net. It is concluded that contractions evoked by Antho-RFamide may be partly due to neuronal activity, but probably also involve direct excitation of the muscles. The diverse excitatory actions of Antho-RFamide suggest that it may be a neurotransmitter or neuromodulator in sea anemones.

scholarly journals Gender Differences in Kinematic Parameters of Topspin Forehand and Backhand in Table Tennis

2020 ◽  
Vol 17 (16) ◽  
pp. 5742 ◽  
Author(s):  
Ziemowit Bańkosz ◽  
Sławomir Winiarski ◽  
Ivan Malagoli Lanzoni
Keyword(s):  
Gender Differences ◽  
Movement Pattern ◽  
Table Tennis ◽  
Kinematic Parameters ◽  
Maximum Acceleration ◽  
Male And Female ◽  
Tennis Players ◽  
Maximal Acceleration ◽  
The Difference ◽  
Muscle Groups

Background: The identification of gender differences in kinematics and coordination of movement in different body segments in sports may improve the training process by emphasizing the necessity of its differentiation, and consequently individualization, developing, and improving the technique in women and men. Indicating differences can also help in determining the risk of injury in order to prevent from them by diversifying training programs. However, there is no information regarding this problem in the existing literature pertaining to table tennis. Therefore, the aim of the study was to evaluate the differences in the values of selected angular and kinematic parameters during topspin forehand and topspin backhand shots between male and female table tennis players. Methods: Six male and six female advanced table tennis players performed topspin forehand and topspin backhand shots, both receiving a backspin ball. The angular parameters in four events (ready position, backswing, maximum acceleration, and forward) at chosen joints as well as the maximal acceleration of the playing hand were measured, using the myoMotion system, and were compared between male and female players. Results: Significant differences (p ≤ 0.05) were found in the magnitude of angular parameters and maximum hand acceleration between men and women. The movement pattern of topspin strokes performed by men takes into account, more than that in the case of women, movements that use large muscle groups and large joints (hip joints, trunk joints, shoulder joints in extension, and flexion). The difference in the values of maximal acceleration reached almost 50 m/s2 in topspin forehand (p < 0.01) and 20 m/s2 in backhand (p < 0.01). Conclusions: Differentiation of movement patterns can be a manifestation of movement optimization due to anthropological differences and limitations. The differences in the values of maximal acceleration suggest that women could use both sides to perform a topspin attack against the backspin ball, while men should seek opportunities to make a stronger shot with a forehand topspin.

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