Int J Sports Med 1994; 15(2): 80-83
DOI: 10.1055/s-2007-1021024
Training and Testing

© Georg Thieme Verlag Stuttgart · New York

Daily Variation in Step Length of Trained Male Runners

M. Craib, C. Caruso, R. Clifton, C. Burleson, V. Mitchell, D. Morgan
  • The University of North Carolina at Greensboro, Greensboro, North Carolina 27412-5001
Further Information

Publication History

Publication Date:
14 March 2008 (online)


The purpose of this study was to quantify daily intra-individual variability in mean step length, a basic descriptor of the running pattern. Following 60 minutes of treadmill accommodation, nine trained male subjects (X age = 34.2yrs±7.2, × V̇O2max = 57.0±4.8ml·kg·-1·min-1) performed daily (Mon-Fri) 6-minute treadmill runs at three submaximal speeds (2.68, 3.13 and 3.58m·s-1) over a 4-week period. To minimize extraneous influences, subjects refrained from road racing and completed the 20 running sessions (5d·wk-1·4 weeks for each speed) at the same time of day and in the same footwear. Treadmill velocity was calibrated for each 6-minute running bout and step length was determined during the last 2 minutes of each run. Results indicated that mean step length and coefficient of variation values were 0.984m and 2.50% at 2.68 m·s-1, 1.124m and 2.22% at 3.13m·s-1, and 1.254m and 2.26% at 3.58 m·s-1. Reliability analyses indicated that the percentage of variation accounted for in step length across all speeds was high and improved very little as test number increased (range = 96% for two days vs 99% for five days). Taken together, these findings suggest that when testing conditions are controlled, within-subject variability in step length measures obtained at multiple submaximal running speeds is small in trained subjects and that criterion step length values can be obtained by averaging duplicate measurements.