Reliability And Validity Of The Push And Gflight System For Vertical Jump Test
Bibliographic record
Abstract
Vertical jump tests are often used in sports to primarily measure the power of the lower body. There are several protocols and several measurement tools to record these types of results PURPOSE: The purpose of the present study was to determine the validity of two devices (gFlight and PUSH) to measure the height of vertical jumps. METHODS: 120 jumps were performed in total [60 Squat Jump (SJ) and 60 Countermovement Jump (CMJ)]. Three university students, two males and one female, [age: 28.33 ± 2.08 years; height: 171.00 ± 7.55 cm; weight: 70.00 ± 9.90 kg] performed 20 jumps of each type (SJ and CMJ). Each participant took turns performing 20 SJ (paused 2 seconds at 90 degree) with both hands on their hips. A rest of 15-20 seconds was allowed between jumps. After a complete rest of 10 minutes, participants had to perform 20 CMJ with arm swing. The vertical jump heights of both devices (infrared vertimeter named the gFlight system, V2, Sterling, États-Unis, and an accelerometer placed at hip level named the PUSH system, built by PUSH, Toronto, Canada) were compared to the gold standard measurement obtained with the contact mat (Ergo Jump Bosco System). Values are reported as means±SD. A single factor (height) ANOVA and Pearson correlation analysis were performed using SPSS (Ver. 27). RESULTS: Average jump heights were similar between gFlight (22.72 ± 7.94 cm), PUSH (24.94 ± 6.86 cm) and contact mat (24.94 ± 7.78 cm), but gFlight was significantly lower (F(2, 238) = 56.88, p = .0001, ηP2 = .323) when compared to the other two measurements. The coefficient of determination (r2) was 0.945 (r = 0.972, p ≤ 0.001) for gFlight and r2 = 0.875 (r = 0.935, p ≤ 0.001) for PUSH when compared to the contact mat, respectively. Bland-Altman analysis indicated a constant bias of -2.22 cm for the gFlight across the range measured (10-40 cm), but not for the PUSH indicating an increase in error with increasing height when compared to the contact mat, respectively. CONCLUSION: Both devices measure vertical height similarly to the contact mat, but with inherent limitations than can be corrected. The gFlight vertimeter has a constant underestimation of 2.22 cm (within the range of 10-40 cm), while the PUSH reveals a progressive bias where the difference in height measurement becomes larger as height jump increases.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.013 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".