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The hypothesis that ethnicity and sport practice influence the relationship between maximal power in cycling (Pmax) and countermovement jump (CMJ) has been studied by relating CMJ and Pmax in two groups (volleyball players, VB and physical education students, PES) including subjects with Caucasian (67 C) or West African (39 WA) origins. Maximal pow...
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... CMJ was performed with the device described by Vandewalle et al. (1987). CMJ corresponded to the distance between the body height of the subject and the level reached by the head at the peak of the jump (Fig. ...
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... was performed according to the procedure and the device described by Vandewalle et al. (1987) as shown in Fig. 2. This device consisted of two components sliding along a vertical pole. The inferior sliding component was used for the measurement of the body height. A light wooden stick was articulated with the superior sliding component (Fig. 2(f)). CMJ corresponded to the distance between the body height of the subject and the level reached by ...
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... was performed according to the procedure and the device described by Vandewalle et al. (1987) as shown in Fig. 2. This device consisted of two components sliding along a vertical pole. The inferior sliding component was used for the measurement of the body height. A light wooden stick was articulated with the superior sliding component (Fig. 2(f)). CMJ corresponded to the distance between the body height of the subject and the level reached by the head at the peak of the jump (Fig. 2(e)). The Fig. 1. Relationship between maximal power in cycling (Pmax; W/kg) and countermovement jump (CMJ; cm) in different ath- letic groups according to Vandewalle et al. (1987): male sprint ...
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... of two components sliding along a vertical pole. The inferior sliding component was used for the measurement of the body height. A light wooden stick was articulated with the superior sliding component (Fig. 2(f)). CMJ corresponded to the distance between the body height of the subject and the level reached by the head at the peak of the jump (Fig. 2(e)). The Fig. 1. Relationship between maximal power in cycling (Pmax; W/kg) and countermovement jump (CMJ; cm) in different ath- letic groups according to Vandewalle et al. (1987): male sprint runners (A, n = 10), backward rugby players (B, n = 13), field hockey (C, n = 12), soccer (D, n = 12), tennis players (E, n = 12), female ...
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... ± 0.06 1.81 ± 0.07 1.81 ± 0.06 PES, physical education students. subjects performed the vertical jump using a countermovement of the trunk, legs, and arms but without run ( Fig. 2(a) and (c)). They performed two or three jumps with 10-to 15-s recovery between the trials. Thereafter, the subjects had 2-min recovery before jumping again. The height of the stick was increased after each trial provided that they were able to hit it with their vertex ( Fig. 2(b)). At the last trials, when the participants were only able ...
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... a countermovement of the trunk, legs, and arms but without run ( Fig. 2(a) and (c)). They performed two or three jumps with 10-to 15-s recovery between the trials. Thereafter, the subjects had 2-min recovery before jumping again. The height of the stick was increased after each trial provided that they were able to hit it with their vertex ( Fig. 2(b)). At the last trials, when the participants were only able to brush the stick ( Fig. 2(d)), the height was increased by 0.5 cm only. The maximal height corresponded to the highest height before three consecutive unsuccessful trials corresponding to a 0.5-cm increase. Approximately 10 jumps were performed and the highest result was ...
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... They performed two or three jumps with 10-to 15-s recovery between the trials. Thereafter, the subjects had 2-min recovery before jumping again. The height of the stick was increased after each trial provided that they were able to hit it with their vertex ( Fig. 2(b)). At the last trials, when the participants were only able to brush the stick ( Fig. 2(d)), the height was increased by 0.5 cm only. The maximal height corresponded to the highest height before three consecutive unsuccessful trials corresponding to a 0.5-cm increase. Approximately 10 jumps were performed and the highest result was noted. The reliability of CMJ performance is high when measured with this device and this ...
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... Caucasian VB players in the present study jumped 0.045 m higher (P < 0.001) than the value of CMJ predicted from the CMJ-P max regression in the Cau- casian subjects who did not practice cycling (Eqn. [A 2 ], Relationships between maximal power in cycling (Pmax) vs countermovement jump (CMJ). Top: regressions computed in all the volleyball players (continuous line 2a, gray triangles) and all the physical education students (dashed line 2b, gray circles): large white triangle and circle correspond to the means of the volleyball players and physical education students, respectively. ...
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Our research aims to identify the importance of anthropometry measurements and functional testing of two groups that practice sport different, the first group, the experimental group was formed by 25 students (age 10 ± 2.1 years, 13 boys and 12 girls), that practiced 2 hours a week physical education and other 2 hours a week basketball and volleyba...
Citations
... Nevertheless, multiple studies show that individuals with different training levels could have varied training responses including CMJ performance [53][54][55]. Moreover, it is worth noting that the baseline CMJ values can be potentially influenced by the level of athletes [17,27,31], genes and races [39], gender [56], as well as the nature of the sport in which the athlete participates [31,39]. Given such high complexity and interrelated factors between the baseline CMJ performance and the other variables, the non-linear results observed when we only tuned the "Pre-CMJ" feature are not surprising. ...
... Nevertheless, multiple studies show that individuals with different training levels could have varied training responses including CMJ performance [53][54][55]. Moreover, it is worth noting that the baseline CMJ values can be potentially influenced by the level of athletes [17,27,31], genes and races [39], gender [56], as well as the nature of the sport in which the athlete participates [31,39]. Given such high complexity and interrelated factors between the baseline CMJ performance and the other variables, the non-linear results observed when we only tuned the "Pre-CMJ" feature are not surprising. ...
... Interestingly, an increase in CMJ improvement was identified when changing the race from "American" to "Asian or Australian". Although it is well known that genetic factors contribute to athletic performance including power output [39,40], to the best knowledge of the authors, no previous study has directly compared the difference in CMJ improvement between Americans and Asians or Australians. Therefore, it is speculated that both the smaller sample size from the literature using Asian or Australian subjects, and coincidentally, better CMJ improvement observed in those studies contributed to such unexpected differences between the predictions. ...
To solve the research–practice gap and take one step forward toward using big data with real-world evidence, the present study aims to adopt a novel method using machine learning to pool findings from meta-analyses and predict the change of countermovement jump. The data were collected through a total of 124 individual studies included in 16 recent meta-analyses. The performance of four selected machine learning algorithms including support vector machine, random forest (RF) ensemble, light gradient boosted machine, and the neural network using multi-layer perceptron was compared. The RF yielded the highest accuracy (mean absolute error: 0.071 cm; R2: 0.985). Based on the feature importance calculated by the RF regressor, the baseline CMJ (“Pre-CMJ”) was the most impactful predictor, followed by age (“Age”), the total number of training sessions received (“Total number of training_session”), controlled or non-controlled conditions (“Control (no training)”), whether the training program included squat, lunge, deadlift, or hip thrust exercises (“Squat_Lunge_Deadlift_Hipthrust_True”, “Squat_Lunge_Deadlift_Hipthrust_False”), or “Plyometric (mixed fast/slow SSC)”, and whether the athlete was from an Asian pacific region including Australia (“Race_Asian or Australian”). By using multiple simulated virtual cases, the successful predictions of the CMJ improvement are shown, whereas the perceived benefits and limitations of using machine learning in a meta-analysis are discussed.
... According to our data, representatives of China and Tunisia demonstrated the highest rates of development of speed and strength abilities, where they performed the test from 69.1% to 78.8%. In studies conducted by Rouis et al. [42,43], vertical jump height values of Afro-Caribbean participants were higher than Caucasians. This applied not only to adult men, but also had a place for preschoolers, junior high school students, and teenagers. ...
Background and Study Aim. The development of motor skills depends on the process of physical development, as well as the ethno-territorial and cultural context. The study of inter-ethnic differences can provide information about how different lifestyles and contexts of physical activity can influence the process of motor competence development. This can be a real strategy for developing students’ lagging basic motor skills. The purpose of the work is to investigate the ethno-territorial variability of the level of development of physical abilities of students studying at Ukrainian universities.
Material and Methods. Data were obtained from cross-sectional surveys from 2014 to 2019. Students of Ivano-Frankivsk National Medical University (Ukraine) (young men, n = 488, age 18–25) from different countries were recruited. Pedagogical testing was carried out using a battery of tests that were recommended by the State Tests of Physical Fitness of the Population of Ukraine and the European Sports Council (Evrofit Test Battery). Assessment of physical fitness of students was carried out on the basis of a combined percentage scale of multi-level gradation with a step of 1%. Experimental data were processed using the SPSS Statistics 17.0 program.
Results. In almost all countries (with the exception of India and Tunisia), from 41.2% to 70.0% of students are characterized by a low level of development of cardiorespiratory endurance and speed-power fitness (from 54.4% to 58.3%). More than 50.0% of students from Jordan and Egypt have a low level of speed and strength abilities and flexibility. It was found that students from India and Tunisia have the highest rates (endurance - 75.5–80.8%); from China and Tunisia (speed-power abilities - from 69.1% to 78.8%); from Tunisia (speed –79.8%); from China and Tunisia (flexibility -70%); test participants completed the test; from China (power capacity – 76.7%). Students from European countries showed mostly average and above average level of development of physical abilities.
Conclusions. The results of the study indicate the specificity of the development of motor skills of students from different countries, which is manifested in statistically significant differences in the results of test tasks. Students from different countries perform better on those tests that are closer to their known motor experience. This is due to the cultural environment, geographical factor, socio-economic status, as well as the content and goals of the physical education program.
... En todas las modalidades deportivas, el salto no se realiza de forma estandarizada y únicamente con la fuerza del tren inferior como el salto en contramovimiento (CMJ) y el squat jump (SJ), sino que los brazos tienen una participación importante en la ejecución del movimiento (Klavora, 2000;Rouis et al., 2015). Por este motivo, se selecciona el test Abalakov de la batería de ...
... En segundo lugar, respecto al rendimiento específico de la prueba con material, en todas las pruebas específicas donde se evalúa un tipo de desplazamiento (lineal, curvilíneo, cambio de velocidad) fuera del contexto real de juego se podrá valorar el tiempo de ejecución y la velocidad mediante células fotoeléctricas o en su defecto un cronómetro manual, siendo este último método menos válido, fiable y preciso (Haugen y Buchheit, 2016). Finalmente, en cuanto a la capacidad de salto, está podrá ser evaluada mediante esterillas de contacto, plataformas de fuerza o infrarrojos para detectar el tiempo de vuelo y a partir del mismo identificar la altura de salto y la fuerza de impulso generada durante su ejecución (Klavora, 2000;Rouis et al., 2015). ...
La acelerometría es un método de cuantificación de la carga externa que está teniendo una aplicación exponencial gracias a su integración en dispositivos electrónicos para el análisis del rendimiento en deportes colectivos. La carga externa ha sido comúnmente cuantificada a través del desplazamiento (distancia y velocidad), no teniendo en cuenta su efecto a nivel neuromuscular. Por ello, el objetivo principal de la presente Tesis Doctoral es el análisis de la carga externa que soportan múltiples ubicaciones anatómicas de forma simultánea en los desplazamientos deportivos, específicamente en baloncesto. Para ello, se realiza una revisión sistemática detectando que diferentes aspectos técnicos requieren una
evaluación previa al registro así como que los acelerómetros miden la aceleración del segmento al que están unidos. Para subsanar ambos aspectos, se realiza un análisis de la precisión y fiabilidad del sensor, se identifican los índices de carga y frecuencia de muestreo adecuados, así como se diseña y valida un protocolo de registro multi-ubicación y una batería de evaluaciones que representa los desplazamientos más comunes en los deportes de invasión. Finalmente, se realiza la evaluación multi-ubicación de la carga externa en test de laboratorio y test de campo para evaluar el efecto de la velocidad, sexo y tipo de
desplazamiento, así como establecer perfiles de rendimiento individual. A partir de estos resultados, los entrenadores podrán identificar la carga externa específica de cada estructura musculoesquelética para diseñar programas individualizados de acondicionamiento físico, prevención de lesiones y recuperación adaptados a los grupos musculares con mayor carga externa.
Accelerometry is a method for quantifying external load that is having an exponential application thanks to its integration in electronic performance and tracking systems in team sports. External load has been commonly quantified through displacement (distance and speed), not considering its effect at the neuromuscular level. Therefore, the main objective of this Doctoral Thesis is the analysis of the external load supported by multiple anatomical locations simultaneously in sports movements, specifically in basketball. To do this, a systematic review is carried out, detecting those different technical aspects that require an evaluation prior to registration, as well as that the accelerometers measure the acceleration of the segment to which they are attached. To correct both aspects, an analysis of the precision and reliability of the sensor was performed, the appropriate load index and sampling frequency were identified, as well as a multi-location registration protocol and a battery of evaluations that represent the most common displacements in invasion sports were designed and validated. Finally, the multi-location evaluation of the external load was performed in laboratory and field tests to evaluate the effect of speed, sex and type of
movement, as well as to establish individual performance profiles. From these results, trainers will be able to identify the specific external load of each musculoskeletal structure to design individualized programs for physical conditioning, injury prevention and recovery adapted to the muscle groups with the highest external load.
... The ability to perform jumps immediately after landing is especially important in assessing and predicting performance of athletes from different disciplines (Sawyer et al., 2002). In addition, vertical jump tests serve to evaluate anaerobic capacity, motor development and athletic ability in sports (Rouis et al., 2015) and to detect neuromuscular fatigue (Gathercole et al., 2015). Specifically, performance in the DJ test has been related to sprint ability (Barr and Nolte, 2011), and the contact time achieved in DJ tests can be used to identify athletic talent (Bosco et al., 1983). ...
The purpose of this study was to describe the acceleration variables in a plyometric jump test using the inertial sensor built into an iPhone 4S® smartphone, and the jumping variables from a contact mat. A cross-sectional study was conducted involving 16 healthy young adults. Linear acceleration, flight time, contact time and jump height were measured in a drop jump test from 60 cm and from 30 cm. Greater acceleration values were found in the drop jump test from 60 cm; the same was observed for the values from the contact mat. Multiple regression analysis was performed for each drop jump test: jump height was used as the dependent variable, and the most relevant variables were used as predictor variables (weight and maximum angular velocity in the Y axis for analysis of the drop jump from 60 cm, and weight and maximum acceleration in the Z axis for the drop jump from 30 cm). We found a significant regression model for the drop jump test from 60 cm (R2 = 0.515, p “ 0.001) and for the test from 30 cm (R2 = 0.460, p “ 0.01). According to the results obtained in this study, the built-in iPhone 4S® inertial sensor is able to measure acceleration for healthy young adults performing a vertical drop jump test. The acceleration kinematic variables are higher in the drop jump test from 60 cm than from 30 cm.
... Kemiripan karakteristik olahraga sepakbola dan futsal membuat adanya persamaan fungsi fisiologis yang mengkaji kekuatan otot kaki atlet berkulit hitam, yang dibandingkan dengan pemain sepak bola Tunisia berkulit putih, yang dilakukan oleh Karim Ben Ayed dan Imed Latiri, didapatkan kesimpulan bahwa anak laki-laki sepak bola berkulit hitam menunjukkan kinerja lompatan dan berlari lebih tinggi daripada anak-anak yang berkulit putih, hal tersebut disebabkan oleh komposisi otot, dan antropometri yang lebih baik yang dimiliki oleh anak-anak berkulit hitam (Ben Ayed, Latiri, Dore, & Tabka, 2011). Tentunya dengan temuan yang didukung oleh teori-teori sebelumnya (Attiogbé et al., 2018;Ben Ayed et al., 2011;Rouis et al., 2015), membuat penelitian ini semakin menjawab bahwa aktivitas fisik, usia, jenis kelamin, dan khususnya etnis suku mempengaruhi performa fisik. ...
AbstrakTujuan penelitian ini untuk mengetahui dan mengukur karakteristik aktivitas yang dilakukan oleh suku Tulehu dalam aktivitas kesehariannya di saat usia mereka 15-20 tahun, yang dikaitkan dengan performa fisik mereka. Metode penelitian yang digunakan adalah deskriptif kualitatif. Terdapat 7 subjek dari total populasi yang tergabung dalam futsal Maluku Depok Club, yang berusia 20-23 tahun. Memiliki kriteria inklusi dimana setiap individu merupakan asli suku Tulehu Maluku, terdaftar sebagai anggota futsal Maluku Depok club dan berlatih selama 6 bulan, tumbuh dan berkembang di Maluku pada rentang usia 15 – 20 tahun dan bersedia mengikuti wawancara pada penelitian. Sedangkan kriteria eksklusi dalam penelitian ini adalah: Individu bukan asli suku Tulehu Maluku dan tidak pernah tinggal (tumbuh dan berkembang) di Maluku. Simpulan penelitian ini adalah Suku Tulehu dapat lebih mendominasi performa dikarenakan aktivitas fisik yang dilakukan oleh pemuda Tulehu sehari-hari ketika mereka tumbuh dan berkembang (di rentang usia 15-20 tahun). QUALITATIVE STUDY OF EFFECTS OF DAILY ACTIVITIES TOWARD PHYSICAL PERFORMANCE IN FUTSAL FROM TULEHU ETHNIC PLAYERS AbstractThis study measures the characteristics of activities carried out by the Tulehu tribe in their daily activities at the age of 15-20 years, thus affecting their physical performance. The research method using descriptive qualitative. There are 7 subjects from a total population are members of the Maluku Depok Club futsal, aged 20-23 years. Inclusion criteria was individual is a native of Tulehu Maluku, registered as a member of the Maluku Depok futsal club and practiced for 6 months, growing and developing in Maluku at the age range of 15-20 years and willing to take interviews in research. While the exclusion criteria in this study are individuals are not native to the Tulehu ethnic group of Maluku and have never lived (grown and developed) in Maluku. The conclusion is Tulehu tribe dominate more than others because of physical activities did by youth Tulehu when they grow and develop (at vulnerable ages 15-20 years).
... En todas las modalidades deportivas, el salto no se realiza de forma estandarizada y únicamente con la fuerza del tren inferior como el salto en contramovimiento (CMJ) y el squat jump (SJ), sino que los brazos tienen una participación importante en la ejecución del movimiento (Klavora, 2000;Rouis et al., 2015). Por este motivo, se selecciona el test Abalakov de la batería de Bosco (Bosco et al., 1983). ...
... En segundo lugar, respecto al rendimiento específico de la prueba con material, en todas las pruebas específicas donde se evalúa un tipo de desplazamiento (lineal, curvilíneo, cambio de velocidad) fuera del contexto real de juego se podrá valorar el tiempo de ejecución y la velocidad mediante células fotoeléctricas o en su defecto un cronómetro manual, siendo este último método menos válido, fiable y preciso (Haugen y Buchheit, 2016). Finalmente, en cuanto a la capacidad de salto, está podrá ser evaluada mediante esterillas de contacto, plataformas de fuerza o infrarrojos para detectar el tiempo de vuelo y a partir del mismo identificar la altura de salto y la fuerza de impulso generada durante su ejecución (Klavora, 2000;Rouis et al., 2015). ...
Resumen En la actualidad, existe un creciente interés en la evaluación de la carga externa mediante dispositivos inerciales en deportes de invasión. La monitorización se ha estado realizando en una única ubicación anatómica en función de las especificaciones del fabricante. El reto surge cuando la medición en una única ubicación no detecta la carga global del cuerpo y una evaluación en diferentes ubicaciones es requerida para evaluar de forma precisa la carga externa soportada por el deportista. Por tanto, el objetivo del presente estudio es el diseño y validación de una batería de pruebas de campo para la evaluación de carga interna y externa multi-ubicación en relación con los desplazamientos en deportes de invasión. La evaluación está compuesta por un total de cinco pruebas que evalúan las siguientes capacidades/habilidades: (a) aeróbica, desplazamiento lineal; (b) capacidad anaeróbica láctica, aceleración y desaceleración, (c) capacidad anaeróbica aláctica, desplazamiento curvilíneo (d) capacidad elástica, salto, (e) capacidad física condicional, juegos reducidos modificados. Por ello, la evaluación mediante la batería propuesta aportará al cuerpo técnico una visión global y multi-ubicación de la condición física individualizada del deportista. Palabras clave: Deportes de invasión; carga neuromuscular; evaluación; impactos._____________________________________________
Abstract Currently, it exists a study increase related to the external load assessment through inertial devices in invasion team sports. The monitoring is has been performing in one anatomical location depending of the manufacturer recommendations. The challenge arises when the single location measurement does not detect the total load of the body and a multi-location assessment is required to accurately evaluate the athlete's body workload. Therefore, the purpose of the present study is to design and validate a field-test battery for external multi-location workload assessment in the most common displacements in invasion team sports. Five tests composed the battery that evaluate the following capacities/abilities: (a) aerobic, linear displacement; (b) lactic anaerobic capacity, acceleration and deceleration, (c) non-lactic anaerobic capacity, curvilinear displacement (d) elastic capacity, jump, (e) conditional physical capacity, small-sided games. Therefore, using this group of tests will provide the team staff with a global overview and an individualized multi-location workload profile of the athlete.
... 19/33 Rouis, M., et al. (2015). ...
Vertical impulse tests usually designated “jump tests”, are regularly carried out in the assessment of physical performance in athletic performers. The present review aims to explore if such tests can be part of the performance evaluation processes in non-athlete performers. To achieve this, a systematic review was conducted according to PRISMA standards. The databases Pubmed, CINAHL Plus, Medline Complete and Google Scholar were accessed. After applying the inclusion and exclusion criteria, seven articles were selected. Overall conclusions indicate that countermovement jump (CMJ) gathered consensus as the preferred method to evaluate physical performance, particularly with the contribution of upper limbs movement and self-selected range of angular knee joint flexion. Other information gathered include test procedures to enhance vertical test results and the gender influence on test results.
... Por ello, en el uso del rendimiento del salto vertical como predictor de la potencia muscular en las extremidades inferiores, hay una mayor relación entre las variables antropométricas y las condicionales que en las otras. Sin embargo, se ha demostrado en algunos estudios la correlación positiva entre la Wmáx en cicloergómetro y la altura del salto (Rouis et al., 2015;Dore, Bedu & Van Praagh, 2008). Este estudio ha mostrado la novedad de mostrar la relación entre la PAM y la altura del salto, habiendo pocos estudios a nivel internacional, a diferencia de las muchas publicaciones en la literatura que muestran la relación entre la Potencia máxima (Wmax) (test de fuerza-velocidad) a través del Test de Wingate (Balmer, Bird, Richard, Doherty & Smith, 2004;Beneke, Pollmann, Bleif, Leithäuser & Hütler, 2002) o el protocolo de Vandewalle (1987) (Coudrat, Vandewalle & Driss, 2016) con la altura del salto, normalmente en SJ (El Hage, Zakhem, Moussa & Jacob, 2010; Balsalobre et al., 2012) y CMJ (Gorostiaga et al., 2010). ...
El objetivo del estudio es conocer si existe relación entre la PAM, la altura del salto vertical y la composición corporal en jóvenes deportistas de diferentes grupos de edad (12-14 años y 15-16 años) de las especialidades deportivas de ciclismo y triatlón. La muestra estuvo compuesta por un total de 300 jóvenes deportistas de sexo masculino del Centro de Tecnificación de Cheste (n= 150 para cada especialidad y n=75 para cada grupo de edad) de la Comunidad Valenciana, pertenecientes a los Planes de Especialización Deportiva. Los datos fisiológicos y mecánicos corresponden a un test en cicloergómetro incremental con aumentos progresivos crecientes de 15W/min hasta el agotamiento (Storer, Davis & Caiozzo, 1990), los datos antropométricos al protocolo ISAK (ISAK, 2001) y los datos condicionales al test de Bosco (Bosco, Luhtanen & Komi, 1983). Los resultados muestran una relación significativa (p<0,05) entre las variables mecánicas, condicionales y antropométricas mediante la correlación de Pearson. La composición corporal del ciclista permite tener una mejor capacidad de salto y mejores parámetros mecánicos que el triatleta, también influenciado esto por la especificidad del ciclismo en frente al triatlón. Con ello, el entrenador podrá controlar, planificar y evaluar la carga del entrenamiento del deportista para mejorar su estado de forma y rendimiento deportivo.
... The force-velocity test is a useful tool for assessment of power-force-velocity ergometry profile. Performance parameters, i.e. maximal power (Pmax), maximal force (F0) and maximal velocity (V0) Rouis et al., 2015) can either be expressed as absolute or relative to body dimensions. For instance, Pmax can either be expressed as absolute (W) or relative to body mass (W/kg), the latter being commonly used to control the independent effect of body mass (BM) in order to correctly interpret the results when presenting data from routine physical performance tests in individuals with different body sizes. ...
... During the testing sessions, participants performed a standardised warm-up consisting of 5-minutes of continuous pedalling at 80 rpm, with short maximal acceleration ($4 seconds) at the 3rd and 4th minute. After 5 minutes of passive rest, participants were asked to perform the force-velocity test, which consisted of repetitive short all-out sprints of 6-seconds against increasing braking forces, interspaced by 5 minutes of passive recovery Rouis et al., 2015Rouis et al., , 2016. The start braking force of the test was 19.62 N and increased by 19.62 N at each successive sprint. ...
Aim:
To examine the appropriate magnitude of allometric scaling of the force-velocity relationship according to body dimensions and to establish normative data for the power-force-velocity relationship for active men.
Subjects and methods:
Ninety-seven participants completed a force-velocity test on a Monark cycle ergometer. Allometric exponents and percentile ranks were established for maximal power (Pmax), maximal force (F0) and maximal velocity (V0).
Results:
The mean (± SD) of Pmax, F0 and V0 were 1114.90 ± 160.60 W, 191.97 ± 26.51 N, and 227.87 ± 8.82 rpm, respectively. V0 was not related to any body size descriptors. Allometric exponents for Pmax, and F0 scaled for body mass were b = 0.77 (0.64-0.90) and 0.74 (0.61-0.86), respectively. Correlations between allometrically scaled Pmax and F0 with body mass were r = 0.002 (p = 0.984) and r = 0.008 (p = 0.940), respectively, suggesting that the allometric exponents derived were effective in partialling out the effect of body mass on Pmax and F0 results.
Conclusions:
The allometric exponents and normative values of the current study provide a useful tool for comparing the scores of force-velocity tests between individuals without the confounding effect of body size.
... The usefulness of this device may increase with the addition of the assessment of vertical jump height, which is a measure of the muscular strength of the lower extremities that is of interest to physical trainers, coaches, sport clinicians and physiotherapists. The height (in meter; m) reached in a vertical jump is generally considered the gold standard of determining the muscular power of the lower extremities (Earp et al, 2010;Rouis et al, 2015) and is also an indicator of anaerobic fitness (Ostojić et al, 2010). In addition, jump height can provide information concerning the functional capacity of different populations (Amonette et al, 2012;Farias et al, 2013) and physical performance in several sports (Ziv and Lidor, 2010a;Ziv and Lidor, 2010b). ...
Objective: the purpose of the present study was to analyze the concurrent validity and reliability of a force
platform clinical COBS Feedback® for the estimation of the height of vertical jumps. Design: a cross-sectional
correlational and comparative study. Setting: University Human Movement and Physiotherapy Laboratory.
Participants: healthy university students (14 female and 13 male) aged between 18 and 25 years old (mean
= 20.074 ±1.542). Main Outcome Measures: vertical jump heights, technical error and grade of agreement
between methods of measurement. Results: after the 27 subjects performed a total of 135 vertical jumps on
COBS Feedback® platform while simultaneously being recorded with a high-speed camera-based method,
the intraclass correlation coefficient showed an almost perfect concordance between the two methods (ICC
= 0.916, CI95%= 0.882 to 0.940, p<0.001). The technical error of the COBS Feedback® against HSC-Kinovea
video analysis was at 0.310±0.223m, being higher in males than in females (t= -2.822, CI95%: -0.376 to -
0.574, p=0.001). Conclusions: the COBS Feedback® method provided a valid measurement of the flight times
for estimate the vertical jump height as a number of well-known tests and devices.
