Current Methodologies and Implications of Phase Identification of the Vertical Jump: A Systematic Review and Meta-analysis

Eagles, Alexander Neale; Sayers, Mark; Bousson, Matthew; Lovell, Dale I.

doi:10.1007/s40279-015-0350-7

Cited by 44 publications

(49 citation statements)

References 66 publications

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“…Another factor that deserves further comments is the type of jumps assessed here. The CMJ and SJ are consistent with the current literature [14,16,17,26,27]. Another important aspect of the present study is that it appears as the first work using the application in a Paralympic sport, in which it is known that physical assessements are lacking and should be increased [28].…”

Section: Comparison With Prior Work Myjump2supporting

confidence: 90%

Assessing the Validity of the MyJump2 App for Measuring Different Jumps in Professional Cerebral Palsy Football Players: An Experimental Study (Preprint)

Coswig¹,

Silva²,

Barbalho³

et al. 2018

Preprint

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Background: Vertical jumps can be used to assess neuromuscular status in sports performance. This is particularly important in CP Football because the players are exposed to high injury risk, but it may be complicated because the gold standard to assess jump performance is scarce in field evaluation. In this case, field techniques such as mobile apps have been analysed to solve this problem. Objectives: The present study aims to evaluate the reliability of the measures of the MyJump2™ app to assess vertical jump performance in professional CP Football. Methods: We assessed 40 male CP Football athletes (28.1 ± 1.4 years, 72.5 ± 6.2 kg and 176 ± 4.2 cm) through the countermovement jump (CMJ) and squat jump (SJ) using a contact mat. At the same time, we assessed the athletes using the MyJump2 ™ application. Results: There were no significant differences between the instruments in the SJ height (P = .12) and flight time (P = .15). Additionally, there were no significant differences between the instruments for CMJ in the jump height (P = .16) and flight time (P = .13). In addition, it was observed that there were significant and strong intraclass correlations in all SJ variables varying from .84 to 0.89 (P < .05), which was classified as "almost perfect". Similar results were observed in all variables from the CMJ, varying from .91 to 0.92 (P ≤ .05). Conclusions:We conclude that the MyJump2 TM app presents high validity and reliability to measure jump height and flight time of the squat jump and the countermovement jump in CP Football athletes.

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Section: Comparison With Prior Work Myjump2supporting

confidence: 90%

Assessing the Validity of the MyJump2 App for Measuring Different Jumps in Professional Cerebral Palsy Football Players: An Experimental Study (Preprint)

Coswig¹,

Silva²,

Barbalho³

et al. 2018

Preprint

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“…A recent systematic review highlighted a number of different methodologies used to determine the start time of the CMJ (Eagles, Sayers, Bousson, & Lovell, 2015). Three main studies were identified.…”

Section: The Identification Of the Start Of The Jump/ Integrationmentioning

confidence: 99%

“…The first method classifies the initiation of the jump as a 5% reduction in the vertical component of the ground reaction force (VGRF). This method was cited 96 times in the literature by a number of different authors (Eagles et al, 2015). The second and third method defines the start of the jump as the point when the VGRF exceeds a quiet standing value for the participant (typically a value 10 N).…”

Section: The Identification Of the Start Of The Jump/ Integrationmentioning

confidence: 99%

“…The second and third methods have been cited 256 times by a variety of authors (Eagles et al, 2015). There are significant limitations when using these methods to identify the start phase of the jump, for example if the second and third method identifies the initiation of the start of the jump when the VGRF exceeds 10 N in a 1000 N participant, this would represent only 1% of the participant's assumed BW from the VGRF during quiet standing, and the likelihood of a false start would be significant.…”

Section: The Identification Of the Start Of The Jump/ Integrationmentioning

confidence: 99%

“…One mayor limitation of all of the three methods is that they do not consider if VGRF increase at the start of the jump, this would identify the wrong start time for 50% of participants as demonstrated by Owen et al (2014). time which only considers the start of the jump being initiated when there is a decrease in the VGRF for example method 2 and method 3 as descried previously by Eagles et al (2015). This has resulted in part of the positive impulse being cut off, which consequently means there is a larger negative impulse during the eccentric phase, as a result a larger positive impulse is needed during the eccentric phase in order for the impulse to be equal.…”

Section: The Identification Of the Start Of The Jump/ Integrationmentioning

confidence: 99%

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Developing a Criterion Method for Assessing Countermovement Jump Variables in Children Aged 7 to 11 Years

Jones¹

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2018 2 "For every action there is an equal and opposite reaction" Abstract Measuring countermovement jump (CMJ) variables such as instantaneous peak mechanical power output (PPO) in children has been shown to be associated with a wide variety of factors such as measuring bone health and identifying children at risk of motor disorders. Yet, how PPO and other variables are attained lack validity as no criterion method or methods of estimating CMJ variables have been developed for children (aged 7 to 11 years). Therefore, the aim of this thesis was to develop a criterion method for assessing PPO in children. This thesis also sought to develop prediction equations for estimating PPO. Experimental Chapter 1 found absolute differences in unprocessed CMJ variables between elite adults and children highlighting that a new criterion method was needed for children. Experimental Chapter 2 established that CMJ variables that do not account for body size need to represent children by 2 groups, whereas, if body size is accounted then children can be represented as one homogenous group. The findings of this chapter demonstrated that that more than one criterion method was needed to be developed for children.Experimental Chapter 3 developed two criterion methods for assessing PPO from a CMJ for children, reporting a less stringent specification for the children criterion methods when compared to the elite adult criterion method specifications. Having achieved the first part of the thesis aim Experimental Chapter 4 developed a number of regression equations to estimate PPO in children to enable practitioners who do not have access to force platforms to have a means of estimating PPO by easily measured variables in the field such as body mass and flight height. In conclusion, this thesis has made significant steps in providing a standardised method of measuring or estimating PPO and other CMJ variables in children aged 7 to 11 years for future researchers.

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Tamura¹,

Maeda²

2017

Seamless Healthcare Monitoring

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Current Methodologies and Implications of Phase Identification of the Vertical Jump: A Systematic Review and Meta-analysis

Abstract: The results demonstrate that three common methods exist for determination of the VJ phases from force platform data. Consequently, each produce different values for force-time variables when used on a neutral data pool. There is a clear need for a robust agreed method for VJ analysis.

Cited by 44 publications

References 66 publications

Assessing the Validity of the MyJump2 App for Measuring Different Jumps in Professional Cerebral Palsy Football Players: An Experimental Study (Preprint)

Assessing the Validity of the MyJump2 App for Measuring Different Jumps in Professional Cerebral Palsy Football Players: An Experimental Study (Preprint)

Developing a Criterion Method for Assessing Countermovement Jump Variables in Children Aged 7 to 11 Years

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