Development and Validation of a Regression Model to Estimate VO2peak from PACER 20-m Shuttle Run Performance

2006 ◽  
Vol 3 (s2) ◽  
pp. S34-S46 ◽  
Author(s):  
Matthew T. Mahar ◽  
Gregory J. Welk ◽  
David A. Rowe ◽  
Dana J. Crotts ◽  
Kerry L. McIver
Keyword(s):  
Regression Model ◽  
Body Mass ◽  
Cross Validation ◽  
Total Sample ◽  
Regression Equation ◽  
Validation Sample ◽  
Multiple Correlation ◽  
Males And Females ◽  
Development And Validation ◽  
Shuttle Run

Background:The purpose of this study was to develop and cross-validate a regression model to estimate VO2peak from PACER performance in 12- to 14-year-old males and females.Methods:A sample of 135 participants had VO2peak measured during a maximal treadmill test and completed the PACER 20-m shuttle run. The sample was randomly split into validation (n = 90) and cross-validation (n = 45) samples. The validation sample was used to develop the regression equation to estimate VO2peak from PACER laps, gender, and body mass.Results:The multiple correlation (R) was .66 and standard error of estimate (SEE) was 6.38 ml·kg−1·min−1. Accuracy of the model was confirmed on the cross-validation sample. The regression equation developed on the total sample was: VO2peak = 47.438 + (PACER*0.142) + (Gender[m=1, f=0]*5.134) − (body mass [kg]*0.197), R = .65, SEE = 6.38 ml·kg–1·min–1.Conclusions:The model developed in this study was more accurate than the Leger et al. model and allows easy conversion of PACER laps to VO2peak.

Prediction of VO2peak from the 20-m Shuttle-Run Test in Youth With Down Syndrome

2011 ◽  
Vol 28 (2) ◽  
pp. 146-156 ◽  
Author(s):  
Stamatis Agiovlasitis ◽  
Kenneth H. Pitetti ◽  
Myriam Guerra ◽  
Bo Fernhall
Keyword(s):  
Body Mass Index ◽  
Down Syndrome ◽  
Oxygen Uptake ◽  
Regression Model ◽  
Body Mass ◽  
Prediction Equation ◽  
Peak Oxygen Uptake ◽  
Run Test ◽  
Shuttle Run

This study examined whether 20-m shuttle-run performance, sex, body mass index (BMI), age, height, and weight are associated with peak oxygen uptake (VO2peak) in youth with Down syndrome (DS; n = 53; 25 women, age 8–20 years) and whether these variables can be used to develop an equation to predict VO2peak. BMI, 20-m shuttle-run performance, and sex were significantly associated with VO2peak in youth with DS, whereas age, height, and weight were not. A regression model included only shuttle-run performance as a significant predictor of VO2peak; however, the developed prediction equation had low individual predictability. Therefore, 20-m shuttle-run performance alone does not provide valid prediction of VO2peak in youth with DS. Sex, BMI, age, height, and weight do not improve the prediction of VO2peak.

Morphology and Hydrodynamic Resistance in Young Swimmers

2001 ◽  
Vol 13 (3) ◽  
pp. 246-255 ◽  
Author(s):  
Nataphoom Benjanuvatra ◽  
Brian A. Blanksby ◽  
Bruce C. Elliott
Keyword(s):  
Body Mass ◽  
Drag Force ◽  
Water Surface ◽  
Regression Equation ◽  
Hydrodynamic Resistance ◽  
Age Group ◽  
Males And Females

Six 9-, 11-, and 13-year-old, anthropometrically matched males and females were towed on the water surface via a mechanical winch at 1.3 to 2.5 ms−1 in increments of 0.3 ms−1 during a prone streamlined glide. Passive drag force of the 13-year age group was significantly larger than that of the 9-year age group at 1.9, 2.2, and 2.5 ms−1, but not at 1.3-1.6 ms−1. While anthropometry did not feature in any regression equation at any age for passive drag at velocities of 1.3 and 1.6 ms−1, body mass was the best predictor of drag at 1.9 and 2.5 ms−1.

Northwestern Syntax Screening Test

1980 ◽  
Vol 45 (2) ◽  
pp. 200-208 ◽  
Author(s):  
David L. Ratusnik ◽  
Thomas M. Klee ◽  
Carol Melnick Ratusnik
Keyword(s):  
Regression Model ◽  
Screening Test ◽  
Test Score ◽  
Cross Validation ◽  
Multiple Regression Model ◽  
Validation Sample ◽  
Test Items ◽  
One Year ◽  
The One ◽  
Total Test

The NSST was administered to 900 children aged three years to seven years, 11 months. Using a step-wise multiple regression model, the test was shortened from 20 to 11 test items receptively and expressively, while accounting for 95% of total test score variance. This shortened form, taking approximately 10 minutes to administer, was normed in six-month intervals as opposed to the one-year intervals of the original NSST. A cross validation sample of 301 children was used to demonstrate that comparable clinical decisions are made employing either form.

scholarly journals A psychometric investigation into the cross validation of an adaptation of the Ghiselli Predictability Index in personnel selection

2006 ◽  
Vol 32 (4) ◽  
Author(s):  
Callie Theron ◽  
Deon Meiring
Keyword(s):  
Regression Model ◽  
Personnel Selection ◽  
Cross Validation ◽  
Future Research ◽  
Validation Sample ◽  
Holdout Sample ◽  
Predictability Index ◽  
The Cross ◽  
Psychometric Investigation ◽  
Positive Results

Twigge, Theron, Steele and Meiring (2004) concluded that it is possible to develop a predictability index based on a concept originally proposed by Ghiselli (1956, 1960a, 1960b), which correlates with the real residuals derived from the regression of a criterion on one or more predictors. The addition of such a predictability index to the original regression model was found to produce a statistically significant increase in the correlation between the selection battery and the criterion. To be able to convincingly demonstrate the feasibility of enhancing selection utility through the use of predictability indices would, however, require the cross validation of the results obtained on a derivation sample on a holdout sample selected from the same population. The objective of this article consequently is to investigate the extent to which such a predictability index, developed on a validation sample, would successfully cross validate to a holdout sample. Encouragingly positive results were obtained. Recommendations for future research are made.

scholarly journals RELIABILITY OF TESTS FOR SPEED AND AGILITY ASSESSMENT IN CADET BASKETBALL PLAYERS

2021 ◽  
pp. 559
Author(s):  
Miloš Lukić ◽  
Adam Petrović ◽  
Nemanja Ćopić ◽  
Svetlana Petronijević ◽  
Srećko Jovanović
Keyword(s):  
Body Mass ◽  
Body Height ◽  
Total Sample ◽  
Basketball Player ◽  
Basketball Players ◽  
Reliable Test ◽  
Correlation Studies ◽  
Agility Assessment ◽  
The Mean ◽  
Shuttle Run

The aim of this research is to determine whether the Illinois test (IL), T-test (Tt), 4x5m Shuttle run (4x5m), 20 m Sprint (S20m), 10 m Sprint (S10m) are reliable tests in assessing the speed and agility of cadet basketball players. The strategy of this research involved a traditional quantitative approach to research with a correlation studies design. The total sample consisted of 38 male participants. The mean age of the participants was -AGE=16.03 years, body height-BH=183.5 cm; body mass-BM=74.1 kg; Body Mass Index-BMI=22.08 kg/m2. The most reliable agility test when performing without a ball is ILNB, while less reliable are TtNB and the 4x5mNB, both without a ball. A reliable test that is performed without a ball to assess the speed of a cadet basketball player is the S10mNB. On the other hand, all speed and agility tests when performed with a ball are reliable for testing cadet basketball players. The proposed speed and agility tests have proven to be reliable for cadet basketball players.

Seasonal Variation of Suicide in the City of São Paulo, Brazil, 1996–2010

Crisis ◽  
2014 ◽  
Vol 35 (1) ◽  
pp. 5-9 ◽  
Author(s):  
Daniel Hideki Bando ◽  
Fernando Madalena Volpe
Keyword(s):  
Seasonal Pattern ◽  
Total Sample ◽  
Sao Paulo ◽  
Seasonal Patterns ◽  
São Paulo ◽  
Health Statistics ◽  
Males And Females ◽  
June July ◽  
The City ◽  
Over Time

Background: In light of the few reports from intertropical latitudes and their conflicting results, we aimed to replicate and update the investigation of seasonal patterns of suicide occurrences in the city of São Paulo, Brazil. Methods: Data relating to male and female suicides were extracted from the Mortality Information Enhancement Program (PRO-AIM), the official health statistics of the municipality of São Paulo. Seasonality was assessed by studying distribution of suicides over time using cosinor analyses. Results: There were 6,916 registered suicides (76.7% men), with an average of 39.0 ± 7.0 observed suicides per month. For the total sample and for both sexes, cosinor analysis estimated a significant seasonal pattern. For the total sample and for males suicide peaked in November (late spring) with a trough in May–June (late autumn). For females, the estimated peak occurred in January, and the trough in June–July. Conclusions: A seasonal pattern of suicides was found for both males and females, peaking in spring/summer and dipping in fall/winter. The scarcity of reports from intertropical latitudes warrants promoting more studies in this area.

Health Status of Senior Citizens: A Cross-sectional study

2020 ◽  
Vol 11 (01) ◽  
Author(s):  
Priyanka Beniwal ◽  
Chandrakala Singh
Keyword(s):  
Health Status ◽  
Senior Citizens ◽  
Total Sample ◽  
Cross Sectional Study ◽  
Age Group ◽  
Poor Health Status ◽  
Cross Sectional ◽  
Males And Females ◽  
The Individual ◽  
Average Health

Aging is a series of processes that begin with life and continue throughout the lifecycle. It represents the closing period in the lifespan, a time when the individual looks back on life, lives on past accomplishments and begins to finish off his life course. It represents the accumulation of changes in person over time. The study aims to investigate the health status of senior citizens. The present study was carried out in Hisar and Sirsa district of Haryana state. A total of 400 elderly equally representing both males and females of age group 65-70 years were selected randomly for the study. Modified inventory developed by Khan and Lal (2011) was used to assess health status of senior citizens. The results of the study elucidated that health status of senior citizens depicted that 54.25 per cent of the total respondents had average health status followed by good (25.25%) and poor health status (20.50%). The most common health problems reported by the senior citizens were joint pains, back pains, blood pressure, and chest pain etc. Gender wise comparison of total sample further pointed out that females were poor in their health against males.

scholarly journals Convolutional Neural Network-Based Clinical Predictors of Oral Dysplasia: Class Activation Map Analysis of Deep Learning Results

Cancers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1291
Author(s):  
Seda Camalan ◽  
Hanya Mahmood ◽  
Hamidullah Binol ◽  
Anna Luiza Damaceno Araújo ◽  
Alan Roger Santos-Silva ◽  
...  
Keyword(s):  
Cross Validation ◽  
Clinical Predictors ◽  
Oral Dysplasia ◽  
Novel Technologies ◽  
Photographic Images ◽  
The Uk ◽  
Map Analysis ◽  
Development And Validation ◽  
Fold Cross Validation ◽  
Activation Map

Oral cancer/oral squamous cell carcinoma is among the top ten most common cancers globally, with over 500,000 new cases and 350,000 associated deaths every year worldwide. There is a critical need for objective, novel technologies that facilitate early, accurate diagnosis. For this purpose, we have developed a method to classify images as “suspicious” and “normal” by performing transfer learning on Inception-ResNet-V2 and generated automated heat maps to highlight the region of the images most likely to be involved in decision making. We have tested the developed method’s feasibility on two independent datasets of clinical photographic images of 30 and 24 patients from the UK and Brazil, respectively. Both 10-fold cross-validation and leave-one-patient-out validation methods were performed to test the system, achieving accuracies of 73.6% (±19%) and 90.9% (±12%), F1-scores of 97.9% and 87.2%, and precision values of 95.4% and 99.3% at recall values of 100.0% and 81.1% on these two respective cohorts. This study presents several novel findings and approaches, namely the development and validation of our methods on two datasets collected in different countries showing that using patches instead of the whole lesion image leads to better performance and analyzing which regions of the images are predictive of the classes using class activation map analysis.

scholarly journals Development and validation of a regression model for Listeria monocytogenes growth in roast beefs

2021 ◽  
pp. 103770
Author(s):  
Taran Skjerdal ◽  
Lars Erik Gangsei ◽  
Ole Alvseike ◽  
Kyrre Kausrud ◽  
Alessandra De Cesare ◽  
...  
Keyword(s):  
Listeria Monocytogenes ◽  
Regression Model ◽  
Development And Validation
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