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Reliability and Validity

Reliability and Validity

Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.

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In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data

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Reliability and Validity of the 30-15 Intermittent Field Test With and Without a Soccer Ball.

Kathleen M Paulsen¹, Brendon P McDermott¹, Aaron J Myers¹

¹University of Arkansas.

Research Quarterly for Exercise and Sport

|August 26, 2022

Summary

The 30-15 Intermittent Field Test (30-15 IFT) is reliable and valid for female soccer players. Adding a ball to the 30-15 IFT (30-15 IFT-B) maintains reliability but reduces performance.

Keywords:

Cardiorespiratory fitness fitness test soccer talent identification technical skill

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Area of Science:

Sports Science
Exercise Physiology
Soccer Performance

Background:

Assessing intermittent exercise capacity is crucial for soccer players.
The 30-15 Intermittent Field Test (30-15 IFT) is a common tool for this purpose.
Its validity and reliability, particularly with added complexity like ball handling, require further investigation.

Purpose of the Study:

To evaluate the reliability and validity of the 30-15 Intermittent Field Test (30-15 IFT).
To assess the impact of incorporating a ball (30-15 IFT-B) on test outcomes.
To compare performance metrics between the standard and ball-integrated tests.

Main Methods:

Twenty-four collegiate female soccer players participated.
Participants completed one Yo-Yo Intermittent Recovery (YYIR) test and multiple trials of the 30-15 IFT and 30-15 IFT-B.
Measures included maximal intermittent running velocity (VIFT), peak heart rate (HRpeak), and rating of perceived exertion (RPE).

Main Results:

Both 30-15 IFT and 30-15 IFT-B demonstrated good trial-to-trial reliability for VIFT and HRpeak.
VIFT was significantly lower during the 30-15 IFT-B compared to the 30-15 IFT.
Estimated VO2max showed strong correlations between the YYIR, 30-15 IFT, and 30-15 IFT-B.

Conclusions:

The standard 30-15 Intermittent Field Test (30-15 IFT) is a valid and reliable measure for female soccer players.
The 30-15 IFT with a ball (30-15 IFT-B) is reliable but yields lower maximal velocities.
These findings inform test selection for evaluating intermittent aerobic fitness in female soccer.