scholarly journals Muscle Activity Asymmetry of the Lower Limbs During Sprinting in Elite Soccer Players

2020 ◽  
Vol 75 (1) ◽  
pp. 239-245
Author(s):  
Przemysław Pietraszewski ◽  
Artur Gołaś ◽  
Aleksander Matusiński ◽  
Sylwia Mrzygłód ◽  
Aleksandra Mostowik ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Body Height ◽  
Lower Limbs ◽  
Soccer Players ◽  
Emg Activity ◽  
Professional Soccer ◽  
Left And Right ◽  
Muscle Groups ◽  
The Right ◽  
Lh Rh

Abstract The analysis of movement patterns through EMG activity provides the opportunity to identify the muscle groups most involved in a particular exercise, and to determine the scope of inter-limb deficiencies. The aim of the present study was to investigate the effects of a side-to-side muscle activity asymmetry between the left and the right lower limb during sprinting in soccer players. Sixteen professional soccer players took part in the study. Their age, body mass and body height equaled 23.7 ± 7.6 years, 81.2 ± 10.8 kg and 179.3 ± 12.2 cm, respectively. The sprint test consisted of two maximal sprints over 30 m with a 5-min rest interval between each sprint. EMG was recorded bilaterally from the quadriceps, hamstrings and gluteal muscles. Regression analysis revealed a significant effect of a side-to-side average muscle activity asymmetry between the left and right hamstring (LH/RH) muscles during the speed tests at 5 m (p = 0.044), and 30 m (p = 0.045), as well as the left and right glutes (LG/RG) at 5 m (p = 0.044) and 30 m (p = 0.043). Our results indicate that hamstring and glute muscles should be selectively and additionally activated during resistance training in soccer players to prevent injuries and improve sprint performance.

scholarly journals Biomechanical Characteristics for Identifying the Cutting Direction of Professional Soccer Players

2021 ◽  
Vol 11 (16) ◽  
pp. 7193
Author(s):  
Yo Chen ◽  
Tang-Yun Lo ◽  
Fei Xu ◽  
Jia-Hao Chang
Keyword(s):  
Lower Limbs ◽  
Biomechanical Analysis ◽  
Soccer Players ◽  
Professional Soccer ◽  
Movement Characteristics ◽  
Left And Right ◽  
Run Up ◽  
Analysis System ◽  
The Right ◽  
Cutting Direction

(1) Background: To understand the movement characteristics of soccer players when cutting in two directions (45° for the right and left cutting movements) through biomechanical analysis of the lower limbs to identify the cutting direction of the attacker; (2) Methods: A motion analysis system was used to capture the movements of 12 male professional soccer players dribbling to the left and right. Kinematics of the players’ cutting were analyzed, and the paired t-test was used for statistics, with a significant level of α = 0.05; (3) Results: When cutting towards the right, the height of the hip joint during the run-up was low (effect size, ES = 0.41, p = 0.031) at 91.8 ± 7.0 cm. When cutting towards the left, the value was 94.6 ± 6.7 cm. While cutting, the front foot was abducted by 4.3 ± 4.0° at landing when cutting towards the right and adducted by 2.7 ± 5.1° when cutting towards the left (ES = 0.38, p = 0.003); (4) Conclusions: When the attacker carries out the cutting action while approaching the defender, the cutting direction may be predicted by observing the attacker’s hip and foot movements.

Alternate Leg Movement Amplifies Locomotor-Like Muscle Activity in Spinal Cord Injured Persons

2005 ◽  
Vol 93 (2) ◽  
pp. 777-785 ◽  
Author(s):  
Noritaka Kawashima ◽  
Daichi Nozaki ◽  
Masaki O. Abe ◽  
Masami Akai ◽  
Kimitaka Nakazawa
Keyword(s):  
Spinal Cord ◽  
Muscle Activity ◽  
Lower Limbs ◽  
Emg Activity ◽  
Joint Movement ◽  
Experimental Conditions ◽  
Biceps Femoris Muscle ◽  
Cord Injury ◽  
Leg Movement ◽  
The Right

It is now well recognized that muscle activity can be induced even in the paralyzed lower limb muscles of persons with spinal cord injury (SCI) by imposing locomotion-like movements on both of their legs. Although the significant role of the afferent input related to hip joint movement and body load has been emphasized considerably in previous studies, the contribution of the “alternate” leg movement pattern has not been fully investigated. This study was designed to investigate to what extent the alternate leg movement influenced this “locomotor-like” muscle activity. The knee-locked leg swing movement was imposed on 10 complete SCI subjects using a gait training apparatus. The following three different experimental conditions were adopted: 1) bilateral alternate leg movement, 2) unilateral leg movement, and 3) bilateral synchronous (in-phase) leg movement. In all experimental conditions, the passive leg movement induced EMG activity in the soleus and medial head of the gastrocnemius muscles in all SCI subjects and in the biceps femoris muscle in 8 of 10 SCI subjects. On the other hand, the EMG activity was not observed in the tibialis anterior and rectus femoris muscles. The EMG level of these activated muscles, as quantified by integrating the rectified EMG activity recorded from the right leg, was significantly larger for bilateral alternate leg movement than for unilateral and bilateral synchronous movements, although the right hip and ankle joint movements were identical in all experimental conditions. In addition, the difference in the pattern of the load applied to the leg among conditions was unable to explain the enhancement of EMG activity in the bilateral alternate leg movement condition. These results suggest that the sensory information generated by alternate leg movements plays a substantial role in amplifying the induced locomotor-like muscle activity in the lower limbs.

scholarly journals Masticatory muscle Activity in Individuals with Temporomandibular Disorder

2021 ◽  
Vol 64 (3) ◽  
pp. 179-182
Author(s):  
Lyubov V. Smaglyuk ◽  
Anastasiia V. Liakhovska
Keyword(s):  
Muscle Activity ◽  
Clinical Symptoms ◽  
Temporomandibular Disorder ◽  
Normal Activity ◽  
Masticatory Muscles ◽  
Emg Activity ◽  
Muscle Work ◽  
Left And Right ◽  
The Right ◽  
Masseter Muscles

Aim: The aim of our study was to investigate features related to EMG-activity of masticatory muscles in subjects with TMD. materials and methods: The study comprised 22 patients with clinical symptoms of TMD. The average age of the subjects was 29.3 ± 4.4 years. Malocclusion was evaluated according to Angle classification, TMD – according to the Research Diagnostic Criteria (RDC/TMD). Registration of EMG-activity of masseter and anterior temporalis muscles was performed during maximum voluntary clenching, clenching on the right and left sides. Results: Normal activity of the masticatory muscles is characterized by symmetrical and EMG-activity of the masticatory muscles on the left and right sides. EMG-activity of masticatory muscles in subjects with TMD are characterized by: 1) increased values of EMG-activity of temporal and masseter muscles; 2) disproportional and asymmetric muscle work of the masticatory muscles on the right and left sides. Conclusions: Features of masticatory muscles activity in individuals with Angle Class I malocclusion and TMD were found.

Myoelectric Activity Differences in Three Learning Sessions

2002 ◽  
Vol 16 (2) ◽  
pp. 92-96
Author(s):  
Tiina Ritvanen ◽  
Reijo Koskelo ◽  
Osmo H„nninen
Keyword(s):  
High School Students ◽  
Muscle Activity ◽  
Muscle Tension ◽  
Emg Activity ◽  
Traditional Learning ◽  
Myoelectric Activity ◽  
School Students ◽  
Language Laboratory ◽  
Upper Trapezius ◽  
Muscle Groups

Abstract This study follows muscle activity in three different learning sessions (computer, language laboratory, and normal classroom) while students were studying foreign languages. Myoelectric activity was measured in 21 high school students (10 girls, 11 boys, age range 17-20 years) by surface electromyography (sEMG) from the upper trapezius and frontalis muscles during three 45-min sessions. Root mean square (RMS) average from both investigated muscles was calculated. The EMG activity was highest in both muscle groups in the computer-aided session and lowest in the language laboratory. The girls had higher EMG activity in both investigated muscle groups in all three learning situations. The measured blood pressure was highest at the beginning of the sessions, decreased within 10 min, but increased again toward the end of the sessions. Our results indicate that the use of a computer as a teaching-aid evokes more constant muscle activity than the traditional learning situations. Since muscle tension can have adverse health consequences, more research is needed to determine optimal classroom conditions, especially when technical aids are used in teaching.

scholarly journals Seasonal Body Composition Variation Amongst Elite European Professional Soccer Players: An Approach of Talent Identification

2018 ◽  
Vol 62 (1) ◽  
pp. 177-184 ◽  
Author(s):  
Adam Lee Owen ◽  
Carlos Lago-Peñas ◽  
Gordon Dunlop ◽  
Rouissi Mehdi ◽  
Moktar Chtara ◽  
...  
Keyword(s):  
Body Composition ◽  
Lean Body Mass ◽  
Body Mass ◽  
Fat Mass ◽  
Body Height ◽  
Fat Free Mass ◽  
Soccer Players ◽  
Professional Soccer ◽  
Elite Level ◽  
Composition Profiles

AbstractThe primary aim of the investigation was to study the seasonal changes in body composition in elite European soccer players and identify key playing positional differences. Twenty-two players (age = 24 ± 3.7 years, body height = 180.45 ± 5.12 cm, body mass = 76.66 ± 5.34 kg) were tested. Players’ mass (kg), lean body mass (LBM), fat free mass (FFM), fat mass (FM), muscle girths (MG) and sum of 8 skinfolds (mm) were measured across 5 time points (T0 = Start of pre-season training; T1 = End of pre-season training; T2 = Mid-season; T3 = End of mid-season break; T4 = End of season). Players were divided into their tactical positional roles for analysis. The specific positions they were divided into included defenders (n = 8), midfielders (n = 8) and forwards (n = 6). Assessment of training and matchplay exposure were also recorded. Sites-4, Sites-7, Sites-8 and Fat Mass decreased dramatically from T0 to T1 and T2 in all playing positions (p < 0.01), while no remarkable differences were found between T2, T3 and T4. Except for defenders, calf girth and lean mass were higher in T2, T3 and T4 compared to T0 and T1 (p < 0.01). Midfielders were found to be leaner than forwards and defenders in all data collection time point sessions. Defenders showed higher values in calf girth and lean body mass than midfielders and forwards. It can be concluded from this investigation that there are large variances n positional body composition profiles amongst professional European soccer players. Furthermore, significant changes are prevalent and occur across the season from LBM, FFM, MG and skinfold assessment amongst European elite level soccer players.

scholarly journals Effects of intermittent negative pressure and active recovery therapies in the post-match period in elite soccer players: A randomized, parallel arm, comparative study

2020 ◽  
Vol 12 (1) ◽  
pp. 59-68
Author(s):  
Alex Souto Maior ◽  
Marcio Tannure ◽  
Fábio Eiras ◽  
Arthur de Sá Ferreira
Keyword(s):  
Comparative Study ◽  
Skin Temperature ◽  
Negative Pressure ◽  
Lower Limbs ◽  
Soccer Players ◽  
Active Recovery ◽  
Open Label ◽  
Pressure Therapy ◽  
Professional Soccer ◽  
Ergometer Exercise

SummaryStudy aim: This study compared the effects of intermittent negative pressure therapy (INPT) vs. active recovery therapy (ART) on post-match physiological parameters such as serum CK level and skin temperature of the lower limbs in elite soccer players.Material and methods: Twenty healthy male professional soccer players from a Brazilian first division soccer club were enrolled in this randomized, parallel arm, open label, comparative study. After participating in 2 soccer matches, they were randomly assigned to two groups (n = 10) to receive a 30-min session of INPT (intermittent exchange of hypobaric pressure range 33 to 51 mmHg) or ART (self-myofascial release, mobility and stability exercises, and cycle ergometer exercise). The intervention was conducted after a match with assessments immediately before and after the intervention and again 24 h after the intervention.Results: A significant interaction effect (F2,36 = 4.503, p = 0.018, η2 = 0.130) was observed, indicating that the decrease of CK from pre-intervention to 24 h post-intervention was greater in the INPT than in the ART group. Lower limb skin temperature was significantly lower after INPT than after ART (p < 0.003).Conclusions: Serum CK level and skin temperature of lower limbs showed better recovery up to 24 h after the intervention with INPT in elite soccer players.

scholarly journals Muscle strength and inflammatory response to the training load in rowers

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10355
Author(s):  
Tomasz Podgórski ◽  
Alicja Nowak ◽  
Katarzyna Domaszewska ◽  
Jacek Mączyński ◽  
Magdalena Jabłońska ◽  
...  
Keyword(s):  
Muscle Metabolism ◽  
Creatine Kinase Activity ◽  
Lower Limbs ◽  
Total Testosterone ◽  
Blood Biochemical ◽  
Global Force ◽  
Significant Difference ◽  
Muscle Groups ◽  
Torque Values ◽  
The Right

Background Regular exercise leads to changes in muscle metabolism. The consequence of this is the adaptation to higher training loads.The aim of this study was to evaluate biomechanical and biochemical parameters describing the functions of skeletal muscles in periods when changes in training forms were introduced. Methods Seventeen male sweep-oar rowers, members of the Polish national rowing team, participated. The study was carried out at the beginning and at the end of the preparatory period. In the first and second examination measurements of torques of selected muscle groups and blood biochemical analysis were performed. Results There was observed a statistically significant decrease in the relative global force of the right lower limb between both terms of examination. A statistically significant increase in maximum torque was found for torso flexors. In the case of muscles responsible for torso rotation, a statistically significant decrease in the torque values of right torso rotators was observed. A significant difference was found with respect to creatine kinase activity, total testosterone concentration, total testosterone to cortisol ratio and total phenolics concentration (p < 0.05). Conclusion The study shows that the rowers’ training should be more focused on building the strength of lower limbs to prevent the overload of lumbar spine and that the amount of force developed may be significantly affected by the antioxidant potential of rowers.

scholarly journals Laterality of the legs in young female soccer players

2015 ◽  
Vol 16 (4) ◽  
Author(s):  
Katarzyna Z. Antosiak-Cyrak ◽  
Grzegorz Wiczyński ◽  
Elżbieta M. Rostkowska
Keyword(s):  
Young Female ◽  
Lower Limbs ◽  
Soccer Players ◽  
Static Balance ◽  
Balance Test ◽  
Body Balance ◽  
Hop Tests ◽  
Global Movements ◽  
The Right ◽  
Better Than

AbstractPurpose. The aim of the present study was assessment of laterality of the legs of young female soccer players and their non-training counterparts. Methods. The study sample comprised 9 female soccer players and 19 non-training girls. They underwent three measurement sessions, one every six months. The applied tests included kinesthetic differentiation, rate of local movements, static balance, single-leg hop, rate of global movements, strength and speed, and functional asymmetry of the legs tests. Results. The soccer players were better than the controls in their performance of the rate of local movements, rate of global movements, kinesthetic differentiation, single-leg 15m timed hop and static balance tests. Smaller differences between the results of the left and the right legs in soccer players, than in non-training girls, were noted in the rate of local movements, rate of global movements and kinesthetic differentiation tests. In the static balance test, the differences were greater in the group of soccer players. Conclusions. Lateralization of the lower limbs is a highly complex characteristic with a different variability in athletes than in nontraining individuals. The results of the present study also point to the specialization of soccer players’ left legs in body balance and single-leg hop tests.

The Effects of Lifting Posture on Trunk Muscle Activity

1992 ◽  
Vol 36 (10) ◽  
pp. 742-746
Author(s):  
Christopher A. Hamrick ◽  
Sean Gallagher
Keyword(s):  
Muscle Activity ◽  
Latissimus Dorsi ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Oblique Muscle ◽  
Left And Right ◽  
External Oblique ◽  
Four Levels ◽  
The Right ◽  
Guidelines And Recommendations

Trunk muscle activity of twelve healthy males with coal mining experience was examined while each subject lifted a box under various conditions. The independent variables were four levels of posture (kneeling, stooped under a 1.2 m roof, stooped under a 1.6 m roof, and standing), height to which the box was lifted (35 cm or 70 cm), and weight of the lifting box (15 kg, 20 kg, or 25 kg). The dependent variables were the peak EMG values recorded during a lift for each of eight trunk muscles (left and right erectores spinae, left and right latissimus dorsi, left and right external oblique, and left and right rectus abdominis). Posture and weight of lift significantly affected peak activity of the left and right erectores spinae, the left and right latissimus dorsi muscles, and the right external oblique muscle. The latissimus dorsi muscle activity was highest in the low stooping posture, and was lowest in the kneeling posture, while erectores spinae activity was highest in the kneeling posture and decreased as the trunk became more flexed. Thus, the muscle activity during lifting tasks is affected by restricting a worker's posture. Consequently, many lifting guidelines and recommendations currently in use may not be directly applicable to work being performed in restricted postures.

Postural stability in one leg standing on dominant and non-dominant leg in professional soccer players

2017 ◽  
Vol 26 (77) ◽  
pp. 53-64 ◽  
Author(s):  
Przemysław Dębski ◽  
Jacek Mielańczyk ◽  
Rafał Gnat
Keyword(s):  
Postural Stability ◽  
Football Player ◽  
The Body ◽  
Lower Limbs ◽  
Soccer Players ◽  
Balance System ◽  
Professional Soccer ◽  
Sport Competition ◽  
Significant Difference ◽  
The Stability

Stability plays a key role in the sport competition in football. Synchronized operation stabilization of the lower limb and trunk of the support with the dynamic movement of the contralateral limbs allow you to perform tasks specific to the discipline, eg. variety kicking of the ball. Purpose. The aim of the study was to evaluate differences in the capabilities to maintain postural stability in standing on one leg dominant and non-dominant leg with professional players including grouping variables: age, height, weight, volume of training aimed at improving the stability and general internship of football player career. Although commonly assumed that the non-dominant leg is predisposed to act more effective support for the body, the work to date have failed to identify indicated differentiation. It should be noted, however, that they were carried out on small trials in people less active, or among amateur athletes. Basic procedures. The study involved 31 professional soccer players from 1 to 5 level of division. In order to assess postural stability, each of the test performed three times a standard stability test consisting of three 20-second attempt to maintain balance on one leg becoming dominant and non-dominant leg on stabilometric platform BIODEX Balance System. For each of the lower limbs test was repeated three times. Assessment were average angular range deflections platform in the two reference planes, and the volatility of these deflections. These parameters were treated as a measure of postural stability of the respondents. Main findings. In the whole group of patients, no statistically significant differences in the possibilities to maintain postural stability in standing on one leg dominant and non-dominant leg. No significant differences were also detected when considering grouping variables. Conclusions. The results do not indicate a significant difference in the ability to maintain postural stability in standing on one leg dominant and non-dominant leg in professional soccer players.

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