Reliability and Smallest Worthwhile Difference of the NFL-225 Test in NCAA Division I Football Players

Abstract Mann, JB, Ivey, PJ, Brechue, WF, and Mayhew, JL. Reliability and smallest worthwhile difference of the NFL-225 test in NCAA Division I football players. J Strength Cond Res 28(5): 1427–1432, 2014—The NFL-225 test is widely used to assess the strength level and evaluate the progress of college football players during resistance training. Despite the studies evaluating the validity of this test, there are no reports assessing its reliability. The purpose of this study was to determine the reliability and smallest worthwhile difference (SWD) of the NFL-225 test in Division I college football players. Seventy-two players were assessed for more than 3 weeks for the number of repetitions completed with a constant load of 102.3 kg (225 lbs) during winter conditioning. Test sessions occurred on the same day and at the same time 1 week apart. Intraclass correlation coefficients (ICCs) between weeks 1 and 2 (ICC = 0.987), weeks 2 and 3 (ICC = 0.981), and across weeks 1, 2, and 3 (ICC = 0.988) indicated high relative reliability. A small technical error (TE) (TE = 0.5 repetitions) provided strong absolute reliability. The SWD suggests that a change in performance of 3 repetitions or more after training would indicate a meaningful improvement in performance for this test.

[1]  J M Bland,et al.  Statistical methods for assessing agreement between two methods of clinical measurement , 1986 .

[2]  V. M. Zat︠s︡iorskiĭ,et al.  Science and practice of strength training , 1995 .

[3]  J. T. Kearney,et al.  Effects of three resistance training programs on muscular strength and absolute and relative endurance. , 1982, Research quarterly for exercise and sport.

[4]  T. Kizuka,et al.  MUSCULAR ADAPTATIONS TO COMBINATIONS OF HIGH‐ AND LOW‐INTENSITY RESISTANCE EXERCISES , 2004, Journal of strength and conditioning research.

[5]  J. Mayhew,et al.  NFL-225 Test to Predict 1RM Bench Press in NCAA Division I Football Players , 2012, Journal of strength and conditioning research.

[6]  J. Mayhew,et al.  Validation of the NFL-225 test for predicting 1-RM bench press performance in college football players. , 2002, The Journal of sports medicine and physical fitness.

[7]  M. Stone,et al.  Maximum Strength and Strength Training‐‐‐A Relationship to Endurance? , 2006 .

[8]  J. Mayhew,et al.  The Nfl-225 Test as a Measure of Bench Press Strength in College Football Players , 1999 .

[9]  M. Rhea.  DETERMINING THE MAGNITUDE OF TREATMENT EFFECTS IN STRENGTH TRAINING RESEARCH THROUGH THE USE OF THE EFFECT SIZE , 2004, Journal of strength and conditioning research.

[10]  C. Broeder,et al.  Validation of Submaximal Prediction Equations for the 1 Repetition Maximum Bench Press Test on a Group of Collegiate Football Players , 2003, Journal of strength and conditioning research.

[11]  R. Reiser,et al.  HIGH RESISTANCE/LOW REPETITION VS.LOW RESISTANCE/HIGH REPETITION TRAINING: EFFECTS ON PERFORMANCE OF TRAINED CYCLISTS , 2007, Journal of strength and conditioning research.

[12]  J. Mayhew,et al.  Anthropometric Dimensions Do Not Enhance One Repetition Maximum Prediction From the NFL‐225 Test in College Football Players , 2004, Journal of strength and conditioning research.

[13]  F. Naclerio,et al.  The Influence of Strength and Power on Muscle Endurance Test Performance , 2009, Journal of strength and conditioning research.

[14]  Brian L. Schroeder,et al.  Anthropometry Increases 1 Repetition Maximum Predictive Ability of NFL-225 Test for Division IA College Football Players , 2010, Journal of strength and conditioning research.

[15]  William J. Kraemer,et al.  Optimizing Strength Training: Designing Nonlinear Periodization Workouts , 2007 .

[16]  D. Altman,et al.  STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENT , 1986, The Lancet.

[17]  J. Whitehead,et al.  The 225-lb Reps-to-Fatigue Test as a Submaximal Estimate of 1-RM Bench Press Performance in College Football Players , 1998 .

[18]  D. Robbins.  Relationships Between National Football League Combine Performance Measures , 2012, Journal of strength and conditioning research.

[19]  W. Phillips,et al.  Reliability of maximal strength testing in older adults. , 2004, Archives of physical medicine and rehabilitation.

[20]  Daniel W Robbins,et al.  Positional Physical Characteristics of Players Drafted Into the National Football League , 2011, Journal of strength and conditioning research.

[21]  W. Hopkins.  Bias in Bland-Altman but not Regression Validity Analyses , 2004 .

[22]  J. Mihalik,et al.  The National Football League Combine: Performance Differences Between Drafted and Nondrafted Players Entering the 2004 and 2005 Drafts , 2008, Journal of strength and conditioning research.

[23]  W. Brechue,et al.  Upper-Body Work Capacity and 1RM Prediction Are Unaltered by Increasing Muscular Strength in College Football Players , 2009, Journal of strength and conditioning research.

[24]  W G Hopkins,et al.  Measures of Reliability in Sports Medicine and Science , 2000, Sports medicine.

[25]  J. Weir.  Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM. , 2005, Journal of strength and conditioning research.