scholarly journals Comparisons of Vastus Lateralis Architecture and Biomechanical Characteristics during Drop Landing in Young Football Players

2021 ◽  
Vol 30 (3) ◽  
pp. 378-386
Author(s):  
Jong-Hak Lee ◽  
Ho-Seong Lee
Keyword(s):  
Ground Reaction Force ◽  
Muscle Activity ◽  
Vastus Lateralis ◽  
Reaction Force ◽  
Football Players ◽  
Vastus Lateralis Muscle ◽  
Fascicle Length ◽  
Muscle Fascicle ◽  
Drop Landing ◽  
Maximum Flexion Angle

PURPOSE: The purpose of this study was to compare the vastus lateralis (VL) architecture and exercise biomechanics indices during drop landing in young football players.METHODS: Fifteen young football players were divided into a long vastus lateralis muscle fascicle length group (LFG, n=8) and short vastus lateralis muscle fascicle length group (SFG, n=7). All of the participants performed drop landing onto the ground reaction force plate from a platform 30 cm high. The muscle activities of the VL, tibialis anterior (TA), and gastrocnemius (GCM), angular velocity, and ground reaction force in the ankle, knee, and hip joints were measured during drop landing.RESULTS: The VL muscle activity (<i>p</i>=.032), ankle ground contact angle (<i>p</i>=.027), ankle maximum flexion angle (<i>p</i>=.014), knee maximum flexion angle (<i>p</i>=.007), and ground reaction force per body weight (<i>p</i>=.032) were significantly higher in the LFG than in the SFG. Muscle activity of the TA (<i>p</i>=.017), ankle (<i>p</i>=.033), and hip (<i>p</i>=.045) time to stability and the ground reaction force time to stability (<i>p</i>=.043) were significantly lower in the LFG than in the SFG. Muscle activity of the GCM (<i>p</i>=.053) and knee time to stability (<i>p</i>=.057) tended to be lower in the LFG than in the SFG.CONCLUSIONS: These results confirmed that muscle activity, angular velocity, and ground reaction force variables during drop landing are affected by the VL muscle fascicle length in young football players.

scholarly journals Rate of Force Development and Muscle Architecture after Fast and Slow Velocity Eccentric Training

Sports ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 41 ◽  
Author(s):  
Angeliki-Nikoletta Stasinaki ◽  
Nikolaos Zaras ◽  
Spyridon Methenitis ◽  
Gregory Bogdanis ◽  
Gerasimos Terzis
Keyword(s):  
Resistance Training ◽  
Vastus Lateralis ◽  
Muscle Architecture ◽  
Rate Of Force Development ◽  
Vastus Lateralis Muscle ◽  
Eccentric Training ◽  
Fascicle Length ◽  
Force Development ◽  
Muscle Fascicle ◽  
Slow Velocity

The aim of the study was to investigate the rate of force development (RFD) and muscle architecture early adaptations in response to training with fast- or slow-velocity eccentric squats. Eighteen young novice participants followed six weeks (two sessions/week) of either fast-velocity (Fast) or slow-velocity (Slow) squat eccentric-only training. Fast eccentric training consisted of nine sets of nine eccentric-only repetitions at 70% of 1-RM with <1 s duration for each repetition. Slow eccentric training consisted of five sets of six eccentric-only repetitions at 90% of 1-RM with ~4 sec duration for each repetition. Before and after training, squat 1-RM, countermovement jump (CMJ), isometric leg press RFD, and vastus lateralis muscle architecture were evaluated. Squat 1-RM increased by 14.5 ± 7.0% (Fast, p < 0.01) and by 5.4 ± 5.1% (Slow, p < 0.05). RFD and fascicle length increased significantly in the Fast group by 10–19% and 10.0 ± 6.2%, p < 0.01, respectively. Muscle thickness increased only in the Slow group (6.0 ± 6.8%, p < 0.05). Significant correlations were found between the training induced changes in fascicle length and RFD. These results suggest that fast eccentric resistance training may be more appropriate for increases in rapid force production compared to slow eccentric resistance training, and this may be partly due to increases in muscle fascicle length induced by fast eccentric training.

scholarly journals Fully automated algorithm estimates muscle fascicle length from ultrasound image

2020 ◽  
Author(s):  
Tim J. van der Zee ◽  
Arthur D. Kuo
Keyword(s):  
Feature Detection ◽  
Vastus Lateralis ◽  
Ultrasound Image ◽  
Vastus Lateralis Muscle ◽  
Ultrasound Images ◽  
Fascicle Length ◽  
Muscle Fascicle ◽  
Cyclic Movements ◽  
Automated Algorithms

AbstractWhile ultrasound is a useful tool for visualizing muscle in vivo, traditional analysis involves substantial manual labor. Semi-automated algorithms have been introduced in recent years, reducing the amount of time required for extracting pennation angles and fascicle lengths from ultrasound images. Unfortunately, semi-automated algorithms still require some user actions and thereby subjective decision making. We here present a freely available, fully automated feature detection algorithm that involves Hessian filtering to highlight line-like objects within the ultrasound image. Hough transform is used to determine muscle fascicle angles and feature detection is used to determine the location and angle of aponeuroses. As a demonstration, we test the algorithm on ultrasound images obtained from vastus lateralis muscle in healthy individuals (N = 9) during isometric knee extension moment production (0 – 45 N-m) at three knee angles (15-25 deg). Pennation angle, muscle thickness and fascicle length vary with knee moment and knee angle in line with previous observations. Specifically, fascicle length decreases with larger knee moments and increases towards knee flexion. We expect the proposed algorithm to be useful for estimating muscle fascicle lengths during cyclic movements like human locomotion.

scholarly journals Effects of Vastus Lateralis Muscle Fascicle Length on Isokinetic Muscular Strength and Physical Fitness in Collegiate Athletes

2020 ◽  
Vol 22 (3) ◽  
pp. 8-16
Author(s):  
Kwang-Jin Lee ◽  
Ho-Seong Lee
Keyword(s):  
Physical Fitness ◽  
Vastus Lateralis ◽  
Collegiate Athletes ◽  
Peak Torque ◽  
Vastus Lateralis Muscle ◽  
Fascicle Length ◽  
Time To Peak ◽  
Muscle Fascicle ◽  
Isokinetic Muscle Strength ◽  
Lateralis Muscle

OBJECTIVES The purpose of this study was to examine the effects of vastus lateralis muscle fascicle length on isokinetic muscle strength and physical fitness in collegiate athletes.METHODS 32 male collegiate athletes were classified into short fascicle length group (SFG, n=16) and long fascicle length group (LFG, n=16) by ultrasonic imaging. Both groups were tested for isokinetic muscular strength (peak torque, angle of peak torque and time to peak torque) and physical fitness (20 m sprint, T-drill, reaction time, side hop, square hop, figure of 8 hop, sergeant jump and Y-balance).RESULTS LFG showed a positive effect on pennation angle (<i>p</i>=.001), fascicle length (<i>p</i>=.001), angle of peak torque at 180°/sec (<i>p</i>=.037), time to peak torque at 90°/sec and 180°/sec (<i>p</i>=.036; <i>p</i>=.039), 20 m sprint (<i>p</i>=.016), T-drill (<i>p</i>=.005), side hop (<i>p</i>=.001) and square hop (<i>p</i>=.001), respectively compared to SFG. However, there was no difference between both groups of peak torque at 30°/sec, 90°/sec and 180°/sec, angle of peak torque at 30°/sec and 90°/sec, time to peak torque at 30°/sec, reaction time, sergeant jump and Y-balance.CONCLUSIONS These results found that long fascicle length of vastus lateralis muscle have excellent isokinetic muscle strength and physical fitness in collegiate athletes.

Intramuscular fibre conduction velocity and muscle fascicle length in human vastus lateralis

2019 ◽  
Vol 44 (2) ◽  
pp. 133-138
Author(s):  
Spyridon Methenitis ◽  
Angeliki-Nikoletta Stasinaki ◽  
Nikolaos Zaras ◽  
Konstantinos Spengos ◽  
Nikolaos Karandreas ◽  
...  
Keyword(s):  
Muscle Fibre ◽  
Body Mass ◽  
Conduction Velocity ◽  
Vastus Lateralis ◽  
Body Height ◽  
Vastus Lateralis Muscle ◽  
Power Performance ◽  
Fascicle Length ◽  
Muscle Fascicle ◽  
The Relationship

Muscle fascicle length and muscle fibre conduction velocity (MFCV) are thought to be important parameters for power performance. It might be expected that faster muscle fibre conduction velocities would compensate for longer fascicle lengths to increase the speed of action potential propagation along the elongated fibres. However, the relationship between muscle fascicle length and MFCV remains unknown. The aim of the present study was to explore the relationship between average vastus lateralis MFCV and average fascicle length. In 17 moderately trained, healthy, male, physical education students (age, 23.4 ± 3.1 years; body height, 178 ± 5.5 cm; body mass, 82.7 ± 6.9 kg; body mass index, 24.6 ± 1.5 kg·m−2) resting MFCV was measured with intramuscular microelectrodes while muscle architecture was evaluated with ultrasonography. Fascicle length was highly correlated with total MFCV (r = 0.923, p = 0.000), maximum MFCV (r = 0.949, p = 0.000), and MFCV of the fastest (r = 0.709, p = 0.001), but not of the slowest fibres (r = 0.131, p = 0.616). No significant correlations were also found between vastus lateralis thickness or fascicle angle with any of MFCV parameters (r = 0.145–0.430; R2 < 0.130; p > 0.05). These data indicate that average MFCV is associated with average fascicle length in vastus lateralis muscle in different individuals. It seems that participants with longer fascicle lengths have also higher MFCVs.

scholarly journals Peak Vertical Ground Reaction Force during Two-Leg Landing: A Systematic Review and Mathematical Modeling

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Wenxin Niu ◽  
Tienan Feng ◽  
Chenghua Jiang ◽  
Ming Zhang
Keyword(s):  
Mathematical Modeling ◽  
Systematic Review ◽  
Mathematical Model ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Influence Factors ◽  
Vertical Ground Reaction Force ◽  
Surface Stiffness ◽  
Drop Landing ◽  
Vertical Ground

Objectives. (1) To systematically review peak vertical ground reaction force (PvGRF) during two-leg drop landing from specific drop height (DH), (2) to construct a mathematical model describing correlations between PvGRF and DH, and (3) to analyze the effects of some factors on the pooled PvGRF regardless of DH.Methods. A computerized bibliographical search was conducted to extract PvGRF data on a single foot when participants landed with both feet from various DHs. An innovative mathematical model was constructed to analyze effects of gender, landing type, shoes, ankle stabilizers, surface stiffness and sample frequency on PvGRF based on the pooled data.Results. Pooled PvGRF and DH data of 26 articles showed that the square root function fits their relationship well. An experimental validation was also done on the regression equation for the medicum frequency. The PvGRF was not significantly affected by surface stiffness, but was significantly higher in men than women, the platform than suspended landing, the barefoot than shod condition, and ankle stabilizer than control condition, and higher than lower frequencies.Conclusions. The PvGRF and root DH showed a linear relationship. The mathematical modeling method with systematic review is helpful to analyze the influence factors during landing movement without considering DH.

scholarly journals Nature of the coupling between neural drive and force-generating capacity in the human quadriceps muscle

2015 ◽  
Vol 282 (1819) ◽  
pp. 20151908 ◽  
Author(s):  
François Hug ◽  
Clément Goupille ◽  
Daniel Baum ◽  
Brent J. Raiteri ◽  
Paul W. Hodges ◽  
...  
Keyword(s):  
Muscle Force ◽  
Vastus Lateralis ◽  
Quadriceps Muscle ◽  
Myoelectric Activity ◽  
Neural Drive ◽  
Fascicle Length ◽  
Cross Sectional ◽  
Muscle Fascicle ◽  
Generating Capacity ◽  
The Relationship

The force produced by a muscle depends on both the neural drive it receives and several biomechanical factors. When multiple muscles act on a single joint, the nature of the relationship between the neural drive and force-generating capacity of the synergistic muscles is largely unknown. This study aimed to determine the relationship between the ratio of neural drive and the ratio of muscle force-generating capacity between two synergist muscles (vastus lateralis (VL) and vastus medialis (VM)) in humans. Twenty-one participants performed isometric knee extensions at 20 and 50% of maximal voluntary contractions (MVC). Myoelectric activity (surface electromyography (EMG)) provided an index of neural drive. Physiological cross-sectional area (PCSA) was estimated from measurements of muscle volume (magnetic resonance imaging) and muscle fascicle length (three-dimensional ultrasound imaging) to represent the muscles' force-generating capacities. Neither PCSA nor neural drive was balanced between VL and VM. There was a large ( r = 0.68) and moderate ( r = 0.43) correlation between the ratio of VL/VM EMG amplitude and the ratio of VL/VM PCSA at 20 and 50% of MVC, respectively. This study provides evidence that neural drive is biased by muscle force-generating capacity, the greater the force-generating capacity of VL compared with VM, the stronger bias of drive to the VL.

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