Comparison of the Electromyographic activity, Quadriceps: Hamstring coactivation ratio and strength changes of dominant leg muscles in collegiate football and volleyball players during different forms of exercises

2015 ◽  
Vol 11 (2) ◽  
pp. 73-88
Author(s):  
TAJ TANZILA ◽  
◽  
SUBHRA CHATTERJEE ◽  
Keyword(s):  
Electromyographic Activity ◽  
Leg Muscles ◽  
Volleyball Players ◽  
Collegiate Football

scholarly journals Electromyographic activity of the vastus medialis and gastrocnemius implicates a slow stretch-shortening cycle during rowing in the field

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Steffen Held ◽  
Tobias Siebert ◽  
Lars Donath
Keyword(s):  
Performance Enhancement ◽  
Muscular Activity ◽  
Emg Activity ◽  
Electromyographic Activity ◽  
Vastus Medialis ◽  
Leg Muscles ◽  
Rowing Performance ◽  
Specific Muscle ◽  
Two Phases ◽  
Activation Phase

Abstract The consideration of the temporal and electromyographic (EMG) characteristics of stretch-shortening cycles (SSC) are crucial for the conceptualization of discipline-specific testing and training. Since leg muscles are first stretched (eccentric) and then contracted (concentric) during rowing, it can be assumed that the entire muscle tendon complex performs a SSC. Thus, it should be elucidated whether the rowing cycle can be attributed to either a slow or fast SSC. Therefore, EMG of the vastus medialis and gastrocnemius were captured (n = 10, 22.8 ± 3.1 years, 190 ± 6 cm, 82.1 ± 9.8 kg) during (single scull) rowing and subsequently compared to typical slow (countermovement jump, CMJ) and fast (drop jump, DJ) SSCs. The elapsed time between the EMG onset and the start of the eccentric phase was monitored. The pre-activation phase (PRE, before the start of the eccentric phase) and the reflex-induced activation phase (RIA 30–120 ms after the start of the eccentric phase) have been classified. Notable muscular activity was observed during DJ before the start of the eccentric phase (PRE) as well as during RIA. In contrast, neither CMJ nor rowing revealed any EMG-activity in these two phases. Interestingly, CMJ and race-specific rowing showed an EMG-onset during the eccentric phase. We conclude that rowing is more attributable to a slow SSC and implies that fast SSC does not reflect discipline specific muscle action and could hamper rowing-performance-enhancement.

scholarly journals Pengaruh Metode Latihan Plyometric dan Latihan Beban dengan Kecepatan Reaksi terhadap Power Otot Tungkai Pemain Bolavoli Putra

2018 ◽  
Vol 2 (1) ◽  
pp. 176-189
Author(s):  
Supriyanto Supriyanto
Keyword(s):  
High Speed ◽  
Muscle Power ◽  
Weight Training ◽  
Training Methods ◽  
Training Method ◽  
Limb Muscle ◽  
Plyometric Training ◽  
Leg Muscles ◽  
Volleyball Players ◽  
Reaction Speed

The purpose of this study was to know the effect of plyometric training and weight training with reaction speed toward limb muscle of male volleyball players. The method of the study was treatment design level 2 x 2 , where the independent variable was classified in two parts. The findings were: (1) overall, there is different significant effect of plyometric training and weight training toward limb muscle power of volleyball players (Fh = 0.58 <Ft = 4.00), (2) there is interaction between training methods and reaction speed toward limb muscle power of male volleyball players  of SMA IQRO IT Bengkulu city (Fh = 28.39> Ft = 3.97), (3) volleyball players who have high speed reaction have better limb muscle power if using training method rather than training with the Plyometric training method (Fh = 5.35> Ft = 4.01). (4) Volleyball players who have low reaction speed have better limb muscle  power if trained by weight training method (fh = 5.12> ft = 4.01). In Conclusion, volleyball players who have high reaction speed are more efficient trained by weight training, meanwhile volleyball players who have low reaction speed are more efficient trained by plyometric training Keyword: Plyometric Exercise Method, Reaction Speed, Power of Leg Muscles.

scholarly journals Proactive Modulation in the Spatiotemporal Structure of Muscle Synergies Minimizes Reactive Responses in Perturbed Landings

2021 ◽  
Vol 9 ◽  
Author(s):  
Victor Munoz-Martel ◽  
Alessandro Santuz ◽  
Sebastian Bohm ◽  
Adamantios Arampatzis
Keyword(s):  
Mechanical Loading ◽  
Hip Joint ◽  
Joint Moment ◽  
Muscle Synergies ◽  
Electromyographic Activity ◽  
Leg Muscles ◽  
Neuromotor Control ◽  
Unstable Surface ◽  
Muscle Loading ◽  
Weight Acceptance

Stability training in the presence of perturbations is an effective means of increasing muscle strength, improving reactive balance performance, and reducing fall risk. We investigated the effects of perturbations induced by an unstable surface during single-leg landings on the mechanical loading and modular organization of the leg muscles. We hypothesized a modulation of neuromotor control when landing on the unstable surface, resulting in an increase of leg muscle loading. Fourteen healthy adults performed 50 single-leg landings from a 30 cm height onto two ground configurations: stable solid ground (SG) and unstable foam pads (UG). Ground reaction force, joint kinematics, and electromyographic activity of 13 muscles of the landing leg were measured. Resultant joint moments were calculated using inverse dynamics and muscle synergies with their time-dependent (motor primitives) and time-independent (motor modules) components were extracted via non-negative matrix factorization. Three synergies related to the touchdown, weight acceptance, and stabilization phase of landing were found for both SG and UG. When compared with SG, the motor primitive of the touchdown synergy was wider in UG (p &lt; 0.001). Furthermore, in UG the contribution of gluteus medius increased (p = 0.015) and of gastrocnemius lateralis decreased (p &lt; 0.001) in the touchdown synergy. Weight acceptance and stabilization did not show any statistically significant differences between the two landing conditions. The maximum ankle and hip joint moment as well as the rate of ankle, knee, and hip joint moment development were significantly lower (p &lt; 0.05) in the UG condition. The spatiotemporal modifications of the touchdown synergy in the UG condition highlight proactive adjustments in the neuromotor control of landings, which preserve reactive adjustments during the weight acceptance and stabilization synergies. Furthermore, the performed proactive control in combination with the viscoelastic properties of the soft surface resulted in a reduction of the mechanical loading in the lower leg muscles. We conclude that the use of unstable surfaces does not necessarily challenge reactive motor control nor increase muscle loading per se. Thus, the characteristics of the unstable surface and the dynamics of the target task must be considered when designing perturbation-based interventions.

scholarly journals The Effect of Five-Toed Shoes on Electromyographic Activity of Leg Muscles During Stance Phase of Running

2017 ◽  
Vol 6 (4) ◽  
pp. 227-232
Author(s):  
Hamideh Khodaveisi ◽  
Maryam Razaghzadeh ◽  
Mehrdad Anbarian ◽  
◽  
◽  
...  
Keyword(s):  
Stance Phase ◽  
Electromyographic Activity ◽  
Leg Muscles

scholarly journals Swing- and support-related muscle actions differentially trigger human walk–run and run–walk transitions

2001 ◽  
Vol 204 (13) ◽  
pp. 2277-2287 ◽  
Author(s):  
Boris I. Prilutsky ◽  
Robert J. Gregor
Keyword(s):  
Muscle Activation ◽  
Rectus Femoris ◽  
Swing Phase ◽  
Knee Extensors ◽  
Electromyographic Activity ◽  
Sense Of Effort ◽  
Leg Muscles ◽  
Transition Speed ◽  
Walking Speeds ◽  
Preferred Transition Speed

SUMMARY There has been no consistent explanation as to why humans prefer changing their gait from walking to running and from running to walking at increasing and decreasing speeds, respectively. This study examined muscle activation as a possible determinant of these gait transitions. Seven subjects walked and ran on a motor-driven treadmill for 40s at speeds of 55, 70, 85, 100, 115, 130 and 145% of the preferred transition speed. The movements of subjects were videotaped, and surface electromyographic activity was recorded from seven major leg muscles. Resultant moments at the leg joints during the swing phase were calculated. During the swing phase of locomotion at preferred running speeds (115, 130, 145%), swing-related activation of the ankle, knee and hip flexors and peaks of flexion moments were typically lower (P&lt;0.05) during running than during walking. At preferred walking speeds (55, 70, 85%), support-related activation of the ankle and knee extensors was typically lower during stance of walking than during stance of running (P&lt;0.05). These results support the hypothesis that the preferred walk–run transition might be triggered by the increased sense of effort due to the exaggerated swing-related activation of the tibialis anterior, rectus femoris and hamstrings; this increased activation is necessary to meet the higher joint moment demands to move the swing leg during fast walking. The preferred run–walk transition might be similarly triggered by the sense of effort due to the higher support-related activation of the soleus, gastrocnemius and vastii that must generate higher forces during slow running than during walking at the same speed.

scholarly journals Contribution of Leg Muscle Explosive Power and Waist Flexibility to the Accuracy of Volleyball Smashes

2021 ◽  
Vol 3 (1) ◽  
pp. 48-62
Author(s):  
Dini Hidayatul Qudsi ◽  
Sayuti Syahara ◽  
Hendri Irawadi ◽  
Yogi Setiawan
Keyword(s):  
Data Analysis ◽  
Vertical Jump ◽  
Multiple Correlation ◽  
Simple Correlation ◽  
Leg Muscles ◽  
Explosive Power ◽  
Jump Test ◽  
Analysis Technique ◽  
Volleyball Players ◽  
Leg Muscle

The problem in this research is that there is still a lack of smash accuracy on male volleyball players at SMA N 8 Padang. This study aims to determine the contribution between the explosive power of the leg muscles and the flexibility of the waist muscles on the smash accuracy of male volleyball players at SMA N 8 Padang. This research is a correlational type, with a population of this study as many as 20 male players. Sampling was done by saturated sampling, so the sample in this study were 20 male volleyball players at SMA N 8 Padang. The explosive power of the leg muscles was measured by the vertical jump test and the flexibility of the waist muscles by the bridge test, then the accuracy of the volleyball smash was measured by a normal smash. The data analysis technique used was simple correlation analysis and multiple correlation. Results: There was a contribution of the leg muscle explosive power to the accuracy of the volleyball smash of 50.27%. There is a contribution of waist muscle flexibility to the accuracy of the volleyball smash of 43.43%. Then, the leg muscle explosive power and the flexibility of the waist muscles simultaneously contributed to the accuracy of the volleyball smash by 72.93%. Thus, it can be concluded that the leg muscle explosive power and flexibility of the waist contribute to the accuracy of the volleyball smash.

scholarly journals Kondisi Fisik Pemain Bola Voli Klub di Kota Lubuklinggau

2019 ◽  
Vol 2 (2) ◽  
pp. 13-25
Author(s):  
Ever Sovensi ◽  
Muhammad Supriyadi ◽  
Muhammad Suhdy
Keyword(s):  
Physical Condition ◽  
Power Level ◽  
Sampling Technique ◽  
Abdominal Muscle ◽  
Explosive Strength ◽  
Leg Muscles ◽  
Volleyball Player ◽  
Explosive Power ◽  
Volleyball Players ◽  
Abdominal Muscle Strength

The research objective was to determine the physical condition of Club Caroline volleyball players and Lubuklinggau City Club JVC in 2018. This type of research was descriptive quantitative. The population of this study were male volleyball players Club Caroline and Lubuklinggau City Club JVC with all 45 players, consisting of 25 Club Caroline players and 20 Club JVC players. The sample in this study amounted to 45 players, which were taken using total sampling technique. The results of this study explained that the explosive strength of leg muscles possessed by Caroline club volleyball players averaged 108.23 categorized as Enough, while the average explosive power level the limbs owned by JVC club volleyball players are 115.18 categorized Good. Furthermore, the endurance test results possessed by Carolin club volleyball players an average of 32.6 are categorized sufficient, while the average endurance level possessed by Caroline Club volleyball players is 37.7 categorized as moderate. Conclusion, the explosive strength of limb muscles of the Caroline club volleyball player is categorized enough and the explosive strength of the leg muscles of the JVC club players is categorized as good. The durability of Caroline's club volleyball players is categorized enough and those possessed by JVC Club volleyball players are categorized as being moderate. Furthermore, the speed of Caroline club volleyball players and JVC is good. Whereas the agility of the Caroline club players is categorized as good and the agility of the JVC club volleyball players is categorized as Moderate. Furthermore, the abdominal muscle strength of club volleyball players Caroline and JVC entered the Good category. Keywords: Physical Condition, Bolavoli

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