Prediction of Cardio-respiratory Fitness Utilizing a Modified Step Test Protocol

<p><strong>Purpose:</strong> The purpose of this study was to evaluate the validity of the newly developed Jackrabbit step test equation and to determine if the Jackrabbit equation is more reliable than the Queen’s College step test (QCST). It was hypothesized that the Jackrabbit equation would provide a valid prediction of VO₂peak and would provide more reliability than the QCST. <strong>Methods</strong>: One hundred (48 males and 52 females) subjects between the ages of 18-26 performed the QCST, a modified version of the National Young Men’s Christian Association (YMCA) step test, and a VO2peak treadmill test. All subjects completed a PAR-Q, pre-screening form, and were instructed to refrain from alcohol, caffeine, exercise, and over the counter medications for 24 hours and food for 2 hours prior to the test to be eligible for the study.<strong> Results:</strong> There was a significant difference between the measured VO2peak (47.3 ml/kg/min) and predicted VO2peak from the Jackrabbit (48.4 ml/kg/min) and QCST (47.2 ml/kg/min) equations with the Jackrabbit equation being farther from the mean than the QCST equation. Pearson correlations were stronger for the Jackrabbit equation (0.79) compared to the QCST (0.70). Intraclass correlations were also stronger for the Jackrabbit equation (0.989) vs. the QCST equation (0.979). Standard errors of estimate and typical errors of estimate were lower for the Jackrabbit equation than for the QCST equation (TEE = 4.33 to 5.07, SEE = 3.61 to 6.99). The mean difference or bias for the QCST is zero while the mean difference (bias) for the Jackrabbit is 1.2 ml/kg/min. The width of the 95% confidence limits (QCST: 27.4; Jackrabbit: 17.0) indicates that the use of the Jackrabbit equation provides less variation in the prediction of VO2peak. The tails of the mount plot represent differences between the predicted and actual VO2peak as seen in the Queen’s plot. The horizontal line at 2.5% on the x-axis corresponds to the location of 95% of the differences. While the peak for the two plots are equal distance from zero, the width of the Queen’s plot and length of the tails indicate less variance in the Jackrabbit prediction equation. Conclusion: The Jackrabbit equation in conjunction with the modified YMCA step test protocol offered a more valid prediction of VO2peak than the QCST and a less reliable method of assessing VO2peak than the QCST.<br /><br /></p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis - University Access Only

Discipline thesis:degree_discipline

Health and Nutritional Sciences

Year dc:date.available

2013

Author dc:creator

• Kelly, Joshua J.

Contributors dc:contributor

• Jessica Meendering

• Circulatory and Respiratory Physiology
• Nutrition

Statement dc:rights

• <p>In Copyright - Educational Use Permitted<br /><a href="http://rightsstatements.org/vocab/InC-EDU/1.0/">http://rightsstatements.org/vocab/InC-EDU/1.0/</a></p>

Language dc:language

en

Repository record dc:identifier

https://openprairie.sdstate.edu/etd/1442

OAI identifier oai:identifier

oai:openprairie.sdstate.edu:etd-2448