Can We Rely on Flight Time to Measure Jumping Performance or Neuromuscular Fatigue-Overload in Professional Female Soccer Players?

Armada-Cortés, Estrella; Barrajón, Javier Peláez; Benítez-Muñoz, José Antonio; Navarro, Enrique; Juan, Alejandro F. San

doi:10.3390/app10134424

Cited by 8 publications

(10 citation statements)

References 33 publications

(65 reference statements)

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“…One key point of difference is the larger ICC 95% CI's seen in the present study compared to previous work (0.322-0.998), which at the lower end has shown to be greater than 0.680 [26] but typically greater than 0.990 for CMJ assessments [17,18]. Despite this, JH TIA compared JH MJ demonstrated low CV and systematic bias and 95% LoA's, adding to the body of the literature indicating that MyJump is valid when compared to TIA-derived jump height from a force platform.…”

Section: Discussioncontrasting

confidence: 99%

“…Previous work that has compared the performance of MyJump to force-plate-derived TOV measures of jump height in adults is sparse, and the results are equivocal [18,26], whilst the data in the present study would appear to agree with the findings of Carlos-Vivas et al [18], who demonstrated excellent agreement despite a systematic bias where MyJump overestimated jump height derived from TIA. Interestingly, Armada-Cortés et al [26] contradicted the findings of the present and previous work [18], showing poor agreement and a significant mean difference between measures. Armada-Cortés et al [26] conducted validity analysis for combined SJ and CMJ.…”

Section: Discussionsupporting

confidence: 65%

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Agreement between Force Platform and Smartphone Application-Derived Measures of Vertical Jump Height in Youth Grassroots Soccer Players

Tallis

Morris

Duncan

et al. 2023

Sports

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Given the importance of vertical jump assessments as a performance benchmarking tool, the assessment of neuromuscular function and indicator of health status, accurate assessment is essential. This study compared countermovement jump (CMJ) height assessed using MyJump2 (JHMJ) to force-platform-derived jump height calculated from time in the air (JHTIA) and take-off velocity (JHTOV) in youth grassroots soccer players. Thirty participants (Age: 8.7 ± 0.42 yrs; 9 females) completed bilateral CMJs on force platforms whilst jump height was simultaneously evaluated using MyJump2. Intraclass correlation coefficients (ICC), Standard error of measurement (SEM), coefficient of variance (CV) and Bland–Altman analysis were used to compare performance of MyJump2 to force-platform-derived measures of CMJ height. The median jump height was 15.5 cm. Despite a high level of agreement between JHTIA and JHTOV (ICC = 0.955), CV (6.6%), mean bias (1.33 ± 1.62 cm) and 95% limits of agreement (LoA −1.85–4.51 cm) were greater than in other comparisons. JHMJ performed marginally better than JHTIA when compared to JHTOV (ICC = 0.971; 95% CI’s = 0.956–0.981; SEM = 0.3 cm; CV = 5.7%; mean bias = 0.36 ± 1.61 cm; LoA = −3.52–2.80 cm). Irrespective of method, jump height did not differ between males and females (p > 0.381; r < 0.093), and the comparison between assessment tools was not affected by sex. Given low jump heights achieved in youth, JHTIA and JHMJ should be used with caution. JHTOV should be used to guarantee accuracy in the calculation of jump height.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 65%

Agreement between Force Platform and Smartphone Application-Derived Measures of Vertical Jump Height in Youth Grassroots Soccer Players

Tallis

Morris

Duncan

et al. 2023

Sports

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“…The between-subject SD chosen for standardizing was not that of the subjects in our study, since they do not represent a sample of a population of competitive athletes. Instead, we obtained SD from recent studies on CMJ height of elite male [ 19 – 22 ] and female [ 23 – 26 ] football players. The SD were expressed as coefficients of variation (CV), converted to factors, log-transformed, averaged (via equally weighted variances) and back-transformed.…”

Section: Methodsmentioning

confidence: 99%

Accuracy of flight time and countermovement-jump height estimated from videos at different frame rates with MyJump

Pueo¹,

Hopkins²,

Penichet-Tomás³

et al. 2023

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Recent improvements in smartphone video technology may provide sufficient accuracy for estimation of jump height via flight time determined from video recordings of vertical-jump tests. The aim of this study is to evaluate the accuracy of jump height estimated from videos at different frame rates. High-definition videos of 10 young adults (6 males, 4 females) performing 5 countermovement jumps were recorded at a frame rate of 1000 Hz and transcoded to frame rates of 120, 240, and 480 Hz. Flight time in the videos was assessed independently by three observers at each of the four frame rates with MyJump. Flight time and jump height were analyzed with mixed models for estimation of means and of standard deviations representing technical error of measurement (free of within-subject jump-to-jump variability) at each frame rate. The four frame rates and three observers produced practically identical estimates of mean jump height. The technical errors at 120, 240, 480 and 1000 Hz were respectively 3.4, 1.8, 1.2 and 0.8 ms for flight time, and 1.4%, 0.7%, 0.5% and 0.3% for jump height. Assessed relative to either differences in jump height between elite football players (standard deviation of ~12%) or the smallest expected test-retest variability (typical error of ~3%), the technical error was substantial at 120 Hz but negligible at 240 Hz or higher. In conclusion, use of frame rates above 240 Hz to estimate jump height with MyJump will not improve accuracy substantially.

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“…Moreover, a poor correlation has been observed between the vertical maximum force produced in a CMJ and the horizontal maximum force produced in a sprint, especially in high level athletes [53] such as the subjects in the present study. Further, a gold standard CMJ assessment tool (i.e., two force platforms coordinated) [69] might provide high-precision information regarding the difference in force application between the two lower limbs (i.e., previously injured vs. uninjured), and perhaps found data along the same line as the RSA test realized in the present study.…”

Section: Discussionmentioning

confidence: 73%

Evaluation of Neuromuscular Fatigue According to Injury History in a Repeat Sprint Ability Test, Countermovement Jump, and Hamstring Test in Elite Female Soccer Players

et al. 2022

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Sprinting is a fundamental component of the professional soccer player’s ability to achieve the highest performance in the sport. The aim of this study was to analyze the influence of hamstring injury history on the neuromuscular fatigue produced by an RSA test in elite female football players. Nineteen female elite soccer players of the Second Spanish Soccer Division participated in the study. The participants were divided into: (1) a Control group who have not suffered previous muscular injuries and (2) a Hamstring group with previous hamstring injury at least one season prior to the protocol. The players performed a protocol consisting of a Repeat Sprint Ability Test (RSA) (6 × 40 m; 30 s rest), and CMJ and Hamstring tests before and after the RSA. The different variables of the study were compared between groups with a two-way ANOVA for repeated measures. The main findings from the present study were that, in subjects with previous hamstring injury, the performance was impaired compared with the control group: (1) in the initial meters of the sprint during an RSA there was a higher percentage difference between SprintTT and ideal Split in 0–10 m compared to 0–20 m in the hamstring group (p = 0.006; ES = 0.51); and in situations of high fatigue there was a higher %Dif1vs6 compared to %Dif1vs5 (percentage difference between the first sprint and fifth sprint) in the hamstring group (p = 0.005; ES = 0.54) compared with the control group. It seems that in elite female soccer players with previous hamstring injury, RSA-induced fatigue produces a greater decrease in the performance in the first 10 m of the sprint compared to the control uninjured players.

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Can We Rely on Flight Time to Measure Jumping Performance or Neuromuscular Fatigue-Overload in Professional Female Soccer Players?

Cited by 8 publications

References 33 publications

Agreement between Force Platform and Smartphone Application-Derived Measures of Vertical Jump Height in Youth Grassroots Soccer Players

Agreement between Force Platform and Smartphone Application-Derived Measures of Vertical Jump Height in Youth Grassroots Soccer Players

Accuracy of flight time and countermovement-jump height estimated from videos at different frame rates with MyJump

Evaluation of Neuromuscular Fatigue According to Injury History in a Repeat Sprint Ability Test, Countermovement Jump, and Hamstring Test in Elite Female Soccer Players

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