Cross-validation of three jump power equations

Sayers, Stephen P.; Harackiewicz, D.; Harman, Everett A.; Frykman, Peter; Rosenstein, Michael T.

doi:10.1097/00005768-199904000-00013

Cited by 430 publications

(359 citation statements)

References 6 publications

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“…The players were told to run each sprint and execute each jump at maximum effort. Finally, we calculated the fatigue index, maximum and mean power on the RAST, and peak power on the CMJ using the following equations (Sayers, Harackiewicz, Harman, Frykman, & Rosenstein, 1999;Zagatto et al, 2009): 3 ; where "weight" is the weight of the player, expressed in kg, and "time" the seconds it took everyone to run 35 m. The result of this equation is the power in watts for each sprint. The power of each sprint was calculated for each player followed by the peak, mean and minimum values.…”

Section: Methodsmentioning

confidence: 99%

Differences of muscular performance between professional and young basketball players

Balsalobre-Fernández¹,

Tejero-González²,

Campo-Vecino³

et al. 2016

CCD

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High performance in a vertical jump, ability to repeat short sprints (RSA) and muscle power are all three most relevant factors for professional basketball players. Still, there is a lack of studies analyzing the differences of these variables between professional and young basketball players. The aim of this research is to study the differences on the vertical jump, the RSA and mechanical power between professional and elite young basketball players. For this, 11 professional (n = 11, age = 24.3 ± 5.5 years, height = 200 ± 10.4 cm, weight = 98.4 ± 8.7 kg) and nine elite young basketball players (n = 9, age = 15.2 ± 0.4 years, height = 190 ± 6.5 cm, weight = 78.2 ± 5.2 kg) were tested on the Repeated Sprint Test (RAST), Countermovement Jump (CMJ) before and after the RAST, 35 m sprint, and the mechanical power produced in these. The results show non-significance between groups as regards the RAST fatigue index, CMJ height and 35 m sprint time. However, professional players produced significantly more power in these variables than young elite players (p < 0.05 -0.001). These findings may have significant practical relevance on training programs intended for young basketball players.Key words: Adolescents, fitness, muscle power, sport. ResumenEl alto rendimiento en el salto vertical, la capacidad de repetir sprints (RSA) y la potencia muscular son 3 de las variables más importantes para los jugadores de baloncesto profesionales. Sin embargo, hay pocos estudios que analicen las diferencias en estas variables entre jugadores jóvenes de alto nivel y sujetos profesionales. El objetivo de este estudio es analizar las diferencias en el salto vertical (CMJ), la RSA y la potencia muscular entre jugadores de baloncesto profesionales y jóvenes talentos. Para ello, un test de RSA, el CMJ antes y después del test de RSA, el sprint de 35 m y la potencia en dichas variables fueron medidas a 11 jugadores de baloncesto profesionales (n = 11, edad = 24.3 ± 5.5 años, altura = 200 ± 10.4 cm, peso = 98.4 ± 8.7 kg) y a 9 jugadores jóve-nes de élite (n = 9, edad = 15.2 ± 0.4 años, altura = 190 ± 6.5 cm, peso = 78.2 ± 5.2 kg). Los resultados muestran que no hay diferencias significativas entre grupos en la fatiga en el test de RSA, la altura alcanzada en el CMJ o el sprint de 35 m. Sin embargo, los jugadores profesionales produjeron significativamente más potencia en estas variables que los jóvenes (p < 0.05 -0.001). Estos hallazgos pueden tener relevancia práctica en el diseño de los programas de entrenamiento para jugadores jó-venes de baloncesto.

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Section: Methodsmentioning

confidence: 99%

Differences of muscular performance between professional and young basketball players

Balsalobre-Fernández¹,

Tejero-González²,

Campo-Vecino³

et al. 2016

CCD

View full text Add to dashboard Cite

show abstract

“…Two trials were given and the highest value recorded and expressed as a z-score (age-normalised jump height) based on UK reference data (30). Peak power was calculated from body mass and flight time (25), defined as the power exerted during the take-off phase of the jump. This value was expressed as relative to body mass (W•kg -1 ) as relative peak leg power.…”

Section: Methodsmentioning

confidence: 99%

Quantification of the Relative Age Effect in Three Indices of Physical Performance

Sandercock

Taylor

Voss

et al. 2013

Journal of Strength and Conditioning Research

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Abstract.The relative age effect (RAE) describes the relationship between an individual's birth month and their level of attainment in sports. There is a clustering of birth dates just after the cut-off used for selection in age-grouped sports and it is hypothesised that such relatively older sportspeople may enjoy maturational and physical advantages over their younger peers. There is, however, little empirical evidence of any such advantage. This study investigated whether schoolchildren's physical performance differed according to which quarter of the school year they were born in.Mass, stature, BMI, cardiorespiratory fitness, strength and power were measured in n=8550 10-16 year olds (53% male). We expressed test performance as age-and sex-specific z-scores based on reference data with age rounded-down to the nearest whole year and also as units normalised for body mass. We then compared these values between yearly birth quarters There were no significant main effects for differences in anthropometric measures in either sex. Girls born in the first quarter of the school year were significantly stronger than those born at other times when handgrip was expressed as a z-score. As z-scores, all measures were significantly higher in boys born in either the first or second yearly quarters. Relative to body mass, cardiorespiratory fitness was higher in boys born in the first quarter and power higher in those born in the second quarter.The relative age effect does not appear to significantly affect girls' performance test scores when they are expressed as z-score or relative to body mass. Boys born in the first and second quarters of the year had a significant physical advantage over their relatively younger peers. These findings have practical bearing if coaches use fitness tests for talent identification and team selection. Categorising test performance based on rounded-down values of whole-year age may disadvantage children born later in the selection year. These relatively younger children may be less to gain selection for teams or training programmes.

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“…Trials were repeated if a visible countermovement was used. All jumps, were measured using a contact mat (Kinetic Measurement System, Optimal Kinetics, USA), with peak power calculated using previous recommendations (28). Recent support for this approach highlighted strong correlations to peak power measured against force plate data (r = 0.96 and 0.95) for the CMJ and SJ respectively (9).…”

Section: Performance Testingmentioning

confidence: 99%

Relationships Between Field-Based Measures of Strength and Power and Golf Club Head Speed

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Lloyd

Croix

et al. 2013

Journal of Strength and Conditioning Research

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Cross-validation of three jump power equations

Abstract: The SJ equation is a slightly more accurate equation than that derived from CMJ data. This equation should be used in the determination of peak power in place of the formulas developed by both Harman et al. and Lewis. Separate equations for males and females are unnecessary.

Cited by 430 publications

References 6 publications

Differences of muscular performance between professional and young basketball players

Differences of muscular performance between professional and young basketball players

Quantification of the Relative Age Effect in Three Indices of Physical Performance

Relationships Between Field-Based Measures of Strength and Power and Golf Club Head Speed

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