Validity of the Two Systems for Measuring Force and Power of the Lower Extremities (original) (raw)
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Validity of the Myotest® in Measuring Force and Power Production in the Squat and Bench Press
Journal of Strength and Conditioning Research, 2011
of the myotest Ò in measuring force and power production in the squat and bench press. J Strength Cond Res 25(8): 2293-2297, 2011-The purpose of this study was to verify the concurrent validity of a bar-mounted Myotest Ò instrument in measuring the force and power production in the squat and bench press exercises when compared to the gold standard of a computerized linear transducer and force platform system. Fifty-four men (bench press: 39-171 kg; squat: 75-221 kg) and 43 women (bench press: 18-80 kg; squat: 30-115 kg) (age range 18-30 years) performed a 1 repetition maximum (1RM) strength test in bench press and squat exercises. Power testing consisted of the jump squat and the bench throw at 30% of each subject's 1RM. During each measurement, both the Myotest Ò instrument and the Celesco linear transducer of the directly interfaced BMS system (Ballistic Measurement System [BMS] Innervations Inc, Fitness Technology force plate, Skye, South Australia, Australia) were mounted to the weight bar. A strong, positive correlation (r) between the Myotest and BMS systems and a high correlation of determination (R 2 ) was demonstrated for bench throw force (r = 0.95, p , 0.05) (R 2 = 0.92); bench throw power (r = 0.96, p , 0.05) (R 2 = 0.93); squat jump force (r = 0.98, p , 0.05) (R 2 = 0.97); and squat jump power (r = 0.91, p , 0.05) (R 2 = 0.82). In conclusion, when fixed on the bar in the vertical axis, the Myotest is a valid field instrument for measuring force and power in commonly used exercise movements.
Comparative Study on the Lower Limbs Explosive Force Measurement by Classical and Modern Methods
2016
Human development was permanently conditioned and achieved by physical motion. Physical fitness together with cardiorespiratory fitness highlights the development level of the physical capacity of the human being. The explosive force (the detent) is a basic parameter that emphasizes the physical fitness level. The present study proposes to make a comparative analysis on the measurement of the lower limbs explosive force by two different methods: a classical method (the Alpha Fit test) and a modern method (the Myotest device). The Myotest device does not calculate and does not measure only the muscle performance, but it is a tool for improvement and analysis, whose purpose is to optimize the sports performance. The Alpha Fit test, conducted by direct recording with the metric strip, is based on measuring of the height jump. This paper aims at highlighting the most accurate method of measuring the detent. The modern methods of measurement, by means of the devices used, confer a special fidelity of the measured parameters, these being more successful than the classical methods of measuring the detent. The study subjects are represented by male and female students from the University Polytechnic of Bucharest. As a result of the analysis and of correlating the parameters registered between the two methods of measuring the explosive force at the lower limbs level (the Alpha Fit and the Myotest), there was found that there is a significant difference between the classical testing method (the Alpha Fit) and the modern method (the Myotest).
2013
From the biomechanical aspect, explosive strength is required in athletic sport disciplines like long jumping, high jumping and throwing. Particularly, it is required in technical gestures like take off and landing in vertical jumping. The aims of the current research were to determine difference in the explosive strength of lower extremities between: 1) athletes and non-athletes; 2) the participants in relation to gender; 3) athletes in relation to their sport activity. The sample of participants consisted of 240 individuals (120 athletes and 120 non-athletes, i.e., 106 male and 134 female participants, respectively), chosen from the population of high-school students. All of the participants performed five CMJ without the arm swing in order to determine, by using the Myotest device (Sion, Switzerland) the following variables of explosive strength: Height (expressed in cm); Power (expressed in W/kg); Force (expressed in N/kg) and Velocity (expressed in cm/s). For the statistical an...
International Sports Science Alexandria Journal
Background: There are no currently reliable devices for the appropriate calculation of the force exhibited by the muscles in different parts of the body. A device is unique in measuring the contractile force of different groups of muscles of the upper and lower limb is invented. Aim of the work: The aim of this study was to examine of a new device for the assessment of the contractile force of different groups of muscles of upper and lower limbs. Materials and methods: 270 subjects of both sexes at different age group and different body mass index; 135 athletics and 135 non-athletics were assessed on two sessions 2 weeks apart. To aid implementation we have created a new device with freely available software to extract data of the device in Kg and convert it into newton. The contractile force of different groups of muscles of the upper limb was measured at 2 sessions by 3 professional assessors. Statistical analysis using IBM SPSS software package version 20.0. Quantitative data were described using mean and standard deviation for normally distributed data. Comparison between two independent population were done using independent t-test while more than two population were analyzed F-test (ANOVA) to be used. Results: Comparison of the contractile force of different groups of muscles of the upper and lower limbs between the 1st and 2nd measurements revealed that there was a highly significant positive correlation, the kappa in all variables was more than 0.70, indicating a high association of the two measurements. The new device has an excellent for most measures of force in athletics and nonathletics at different age groups. Conclusion: the new device is assessment of the contractile force of different groups of muscles of the upper and lower limbs.
International journal of occupational safety and ergonomics : JOSE, 1998
The aim of the work is to outline a procedure of finding force-velocity (F-V) characteristics (F = f(V)) of individual skeletal muscles of the human locomotor system. The presentation is based on an example concerning extensors of the elbow joint: the lateral and long heads of triceps brachii (TBClat and TBClong). The experimental part of the procedure involves a natural movement of using the upper extremity to push an external object of variable, adjustable load, engaging both the elbow and shoulder joint. Five men aged 23 took part in the experiment. Their task was to push the handle of a physical pendulum whose moment of inertia could be adjusted within the range of 58 kg.m(2)-450 kg.m(2), so as to give it maximum angular velocity. During each trial the movement of the trunk, of the upper extremity and of the pendulum was video recorded and the force applied with the hand to the handle of the pendulum was measured. In order to find the F-V characteristics a simulation model SHOUL...
Myotonometry Method for Assessment Muscle Performance
The aim of this paper is to present the role of myotonometry in assessment muscle viscoelasticity by measurement of force index (IF) and stiffness (S) at thigh muscle groups. The results are used for improve the muscle training. The method is based on mechanic impulse on the muscle group, that involve a muscle response like acceleration, speed and amplitude curves. From these we have information about elasticity, stiffness beginning from mechanic oscillations of muscle tissue. Using this method offer the possibility for monitoring the muscle capacity for produce mechanic energy, that allows a efficiency of movement with a minimal tissue deformation.
Muscle strength testing: evaluation of tests of explosive force production
European Journal of Applied Physiology, 2004
The purpose of the study was to evaluate four tests of explosive force production (EFP). Specifically, the main aims of the study were to assess the reliability of different EFP tests, to examine their relationship with maximum muscle strength, and to explore the relationship between EFP tests and functional movement performance. After an extensive preliminary familiarization with the tasks, subjects (n=26) were tested on maximum explosive strength of the elbow extensor and flexor muscle, as well as on rapid elbow extension and flexion movements performed in both an oscillatory and a discrete fashion. In addition to maximum force (F max ), four different EFP tests were assessed from the recorded force-time curves: the time interval elapsed between achieving 30% and 70% of F max (F 30-70% ), the maximum rate of force development (RFD), the same value normalized with respect to F max (RFD/F max ), and the force exerted 100 ms after the contraction initiation (F 100 ms ). Excluding F 30-70% , all remaining EFP tests revealed either good or fair reliability (intraclass correlation coefficients being within 0.8-1 and 0.6-0.8 intervals, respectively) which was also comparable with the reliability of F max . RFD and F 100 ms demonstrated a positive relationship with F max , but not T 30-70% and RFD/F max . Stronger elbow flexor muscles also demonstrated higher values of RFD and F 100 ms than weaker elbow extensor muscles, while no difference was observed between either T 30-70% or RFD/F max recorded from two muscles. Despite the simplicity of the tested movement tasks, the relationship observed between the EFP tests and the peak movement velocity remained moderate and partly insignificant. It was concluded that most of the EFP tests could be reliable for assessing neuromuscular function in their muscle-force-(or, indirectly, muscle size) dependent (such as RFD and F 100 ms ), or muscle-force-independent (T 30-70% and RFD/ F max ) forms. However, their ''external validity'' when applied to assess the ability to perform rapid movements could be questioned.
International Journal of Sports Science, 2017
The resultant measure of various tests are main theme which the researcher is going to shed light on, that also includes the explosive power measurement of the legs especially the selective test of (Sargent), that depends on the distance that jumps out laboratory vertically, and that was accredited test for a decade. that's why all sporty activities need an explosive power of the legs and their measurements are a necessary for the sporty training, the purpose of the above mentioned test is to valuate the level of the explosive power of the legs muscle during bouncing (jumping) in vertical shape, the vertical jump is defined as the highest point that the athlete can touch from a standing jump, less the height that the athlete can touch from a standing position and thus a jump is a rose by centimetre that's indirect measurement for the explosive power of the legs muscle in the sport researches or previous equation sport. Therefore, by reaching a persuasive scientific result we do achieve service for the company which designate sporty equipment's for the sake of getting an accurate law to measure the explosive power of the legs. Through this research the researcher is trying to study and shed light on all biomechanical existing laws which was used by other researchers in the previous and compare with some of them that means by the comparison of these laws the problem would be summed up so as to get any law that serve this mechanical test, and which one of them is more accurate than any others scientifically, therefore through our knowledge about mechanical law we serve more accurate to the scientific side.
Examination of lower-upper limb of power and force parameters of elite athletes
Physical education of students
Background and Study Aim. In this study, it is aimed to evaluate the power and force parameters of lower and upper extremities of the individual and team athletes who practice different branches. Material and Methods. 32 elite athletes, most of whom are university students, with an average age of 21.16 ± 2.08, who are active in sports, participated in the study. The groups were formed from Boxing and Handball (BG and HG) branches in which the upper extremities are used predominantly and from Taekwondo and Football (TG and FG) branches in which the lower extremities are used predominantly. The anaerobic power values of each individual’s upper and lower extremities were measured by a Monark 894E. The isokinetic force values of dominant arms and legs were measured by a Cybex humac norm device. Results. After examination of the data it was found that the upper extremity power values of BG and HG were significantly higher than TG when the top values of peak powers (PP) were evaluated. I...
Fizicka kultura, 2018
e aim of this paper is to determine the di erences in general and speci c explosive isometric muscle force in male and female cadet judo athletes. e results of the measured contractile characteristics were obtained by application of a standardized test battery using the isometric dynamometry method for the following ve muscle groups: exor muscles of the le (ŠL) and the right hand (ŠD), back (MRT) and leg extensor muscles (NOGE) and the ankle joint plantar exor muscles (LIST). e testing included a sample of 14 participants who were competing in the system of individual national championship of the Republic of Serbia for the given age category. On the basis of the obtained results, it can be argued that a general, statistically signi cant, di erence exists between tested judo athletes in the function of gender, both for the absolute values of the variables of basic and speci c explosive isometric muscle force (Wilks' Lambda Value 0.000, F=898.61, p=0.000), as well as between the partialized (relative) values of the measured variables (Wilks' Lambda Value 0.001, F=325.71, p=0.000). e highest level of di erence between male and female athletes in relation to the absolute values of the obtained results was determined for the variables of the speci c explosive isometric muscle force of the le hand exor muscles (RFD max _ŠL, p=0.001), leg extensor muscles (RFD max _NOGE, p=0.003) and right hand exor muscles (RFD max _ŠD, p=0.005). In relation to the relative values obtained by partialization of absolute values in relation to skeletal muscle mass (SMM) the highest level of di erence was determined for variables of speci c isometric explosive muscle force for the le and the right hand, respectively (RFD max _ŠL SMM , p=0.000; RFD max ŠD SMM , p=0.003). e summarized value of the gender dimorphism index (IPD) is at the level of 71.55 and 53.09% for both absolute basic (RFDF max) and speci c (RFD max) explosive isometric muscle force, respectively. is indicates that the tested girls reached 71.55% and 53.09% of the given contractile characteristics compared to the tested boys. However, when the measured variables are partialized relative to the skeletal muscle mass (SMM), the fore mentioned di erences are lowered to 101.98% and 71.58%, respectively. On general level, the obtained results have shown that there are methodological indications of scienti c justi cation in relation to the partialization of the results of explosive isometric muscle force as a measure of development of contractile muscle potential directly responsible for the intensive manifestation of muscle force in the unit of time, in relation to skeletal muscle mass.