Intra and intersession reliability of the Run RocketTM in recreationally trained participants




Athletic training, Sports performance, Exercise training


Sprint performance plays an important role in the success of many sports including track and field and team-based sports. Resisted sprint equipment has shown to be an effective method to increase sprint velocity and acceleration. The aim of the study was to determine the intrasession and intersession (7 days) reliability of a commercially available resisted sprint machine in recreationally trained individuals for two resistance settings. Fourteen recreationally active participants partook in the study (male = 10, female = 4) over a 7-day period. Three maximal 15m sprints, at two resistance levels (R0 and R5), were undertaken in a randomised order (6 sprints in total at each trial). Intrasession (comparison of the first 3 sprints for each trial) and intersession (mean of the 3 sprints for both trials) correlation coefficient (ICC), coefficients of variation (%CV), average variability, SEM and minimal detectable difference were calculated for 5 and 15m for both resistance levels. Intrasession reliability was very large to nearly perfect across both distances and resistance levels (ICC range .79 - .98), %CV ranged between 2.4 - 5.8% with larger values seen during the first trial for three of the four indices. Intersession reliability was very large to nearly perfect across all variables (ICC range .87 - .97), %CV was small and ranged between 2.0 - 4.1%. Average variability was small for all measurements. The Run RocketTM showed high intra and intersession reliability. The results show that this equipment could be reliably used within a sprint programme for recreationally trained individuals.


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Andre, M., Fry, A., Bradford, L., & Buhr, K. (2013). Determination of Friction and Pulling Forces During a Weighted Sled Pull. J Strength Cond Res, 27(5), 1175-1178.

Bachero-Mena, B., & González-Badillo, J. (2014). Effects of Resisted Sprint Training on Acceleration With Three Different Loads Accounting for 5, 12.5, and 20% of Body Mass. J Strength Cond Res, 28(10), 2954-2960.

Bartolini, J., Brown, L., Coburn, J et al. (2011). Optimal Elastic Cord Assistance for Sprinting in Collegiate Women Soccer Players. J Strength Cond Res, 25(5), 1263-1270.

Bradshaw, E., Hume, P., Calton, M., & Aisbett, B. (2010). Reliability and variability of day-to-day vault training measures in artistic gymnastics. Sports Biomech, 9(2), 79-97.

Bridgeman, L., McGuigan, M., Gill, N., & Dulson, D. (2016). Test-Retest Reliability of a Novel Isokinetic Squat Device With Strength-Trained Athletes. J Strength Cond Res, 30(11), 3261-3265.

Clark, D., Sabick, M., Pfeiffer, R., Kuhlman, S., Knigge, N. & Shea, K. (2009). Influence of Towing Force Magnitude on the Kinematics of Supramaximal Sprinting. J Strength Cond Res, 23(4),1162-1168.

Cronin, J. & Hansen, K. (2006). Resisted Sprint Training for the Acceleration Phase of Sprinting. Strength and Conditioning Journal, 28(4), 42-51.[0042:rstfta];2

Cross, M., Brughelli, M., & Cronin, J. (2014). Effects of Vest Loading on Sprint Kinetics and Kinematics. J Strength Cond Res, 28(7), 1867-1874.

Cross, M., Tinwala, F., Lenetsky, S., Samozino, P., Brughelli, M., & Morin, J. (2016). Determining friction and effective loading for sled sprinting. J Sports Sci, 35(22), 2198-2203.

Cross, M., Brughelli, M., Samozino, P., Brown, S., & Morin, J. (2017). Optimal Loading for Maximizing Power During Sled-Resisted Sprinting. Int J Sports Physiol Perform, 12(8), 1069-1077.

de Hoyo, M., Gonzalo-Skok, O., Sañudo, B., Carrascal, C., Plaza-Armas, J., Camacho-Candil, F., & Otero-Esquina, C. (2016). Comparative Effects of In-Season Full-Back Squat, Resisted Sprint Training, and Plyometric Training on Explosive Performance in U-19 Elite Soccer Players. J Str Cond Res, 30(2), 368-377.

Duthie, G., Pyne, D., Marsh, D., & Hooper, S. (2006). Sprint Patterns in Rugby Union Players During Competition. J Strength Cond Res, 20(1), 208-214.

Dvorak, J., Junge, A., & Grimm, K. (2005). Football medicine manual. Zurich: F-MARC, 81-93.

Ebben, W., Davies, J., & Clewien, R. (2008). Effect of the Degree of Hill Slope on Acute Downhill Running Velocity and Acceleration. J Strength Cond Res, 22(3), 898-902.

Gabbett, T. (2012). Sprinting Patterns of National Rugby League Competition. J Strength Cond Res, 26(1), 121-130.

Girard, O., Mendez-Villanueva, A., & Bishop, D. (2011). Repeated-Sprint Ability – Part I. Sports Med, 41(8), 673-694.

Harrison, A., & Bourke, G. (2009). The Effect of Resisted Sprint Training on Speed and Strength Performance in Male Rugby Players. J Strength Cond Res, 23(1), 275-283.

Hopkins, W.G. (2000). Measures of Reliability in Sports Medicine and Science. Sports Med, 30, 1-15.

Hopkins, W. (2002). A New View of Statistics. Sportsciorg. Available at:

Hopkins, W., G. (2015). Spreadsheets for analysis of variability and reliability. Sportscience, 19, 36-42.

Johnson, A., Eastman, C., Feland, J., Mitchell, U., Mortensen, B., & Eggett, D. (2013). Effect of High-Speed Treadmill Training With a Body Weight Support System in a Sport Acceleration Program With Female Soccer Players. J Strength Cond Res, 27(6), 1496-1502.

Kawamori, N., Nosaka, K., & Newton, R. (2013). Relationships Between Ground Reaction Impulse and Sprint Acceleration Performance in Team Sport Athletes. J Strength Cond Res, 27(3), 568-573.

Kawamori, N., Newton, R., Hori, N., & Nosaka, K. (2014). Effects of Weighted Sled Towing With Heavy Versus Light Load on Sprint Acceleration Ability. J Strength Cond Res, 28(10), 2738-2745.

Koo, T., & Li, M. (2016). A Guideline of Selecting and Reporting Intraclass Correlation Coefficients for Reliability Research. J Chiropr Med, 15(2), 155-163.

Lockie, R., Murphy, A., Knight, T., & Janse de Jonge, X. (2011). Factors That Differentiate Acceleration Ability in Field Sport Athletes. J Strength Cond Res, 25(10), 2704-2714.

Lockie, R., Murphy, A., Schultz, A., Knight, T., & Janse de Jonge, X. (2012). The Effects of Different Speed Training Protocols on Sprint Acceleration Kinematics and Muscle Strength and Power in Field Sport Athletes. J Strength Cond Res, 26(6), 1539-1550.

Lockie, R., Murphy, A., Callaghan, S., & Jeffriess, M. (2014). Effects of Sprint and Plyometrics Training on Field Sport Acceleration Technique. J Strength Cond Res, 28(7), 1790-1801.

Makaruk, B., Sozański, H., Makaruk, H., & Sacewicz, T. (2013). The Effects of Resisted Sprint Training on Speed Performance in Women. Human Movement, 14(2), 116-122.

Malone, S., Hughes, B., Doran, D., Collins, K., & Gabbett, T. (2019). Can the workload–injury relationship be moderated by improved strength, speed and repeated-sprint qualities?. J Sci Med Sport, 22(1), 29-34.

Martínez-Valencia, M., Romero-Arenas, S., Elvira, J., González-Ravé, J., Navarro-Valdivielso, F., & Alcaraz, P. (2015). Effects of Sled Towing on Peak Force, the Rate of Force Development and Sprint Performance During the Acceleration Phase. J Hum Kinet, 46(1), 139-148.

Matthews, M., Comfort, P., & Crebin, R. (2010). Complex Training in Ice Hockey: The Effects of a Heavy Resisted Sprint on Subsequent Ice-Hockey Sprint Performance. J Strength Cond Res, 24(11), 2883-2887.

Monte, A., Nardello, F., & Zamparo, P. (2017). Sled Towing: The Optimal Overload for Peak Power Production. Int J Sports Physiol Perform, 12(8), 1052-1058.

Morin, J., Slawinski, J., Dorel, S. et al. (2015). Acceleration capability in elite sprinters and ground impulse: Push more, brake less?. J Biomech, 48(12), 3149-3154.

Pantoja, P., Carvalho, A., Ribas, L. & Peyré-Tartaruga, L. (2018). Effect of weighted sled towing on sprinting effectiveness, power and force-velocity relationship. PLOS ONE, 13(10), p.e0204473.

Paulson, S., & Braun, W. (2011). The Influence of Parachute-Resisted Sprinting on Running Mechanics in Collegiate Track Athletes. J Strength Cond Res, 25(6), 1680-1685.

Petrakos, G., Morin, J., & Egan, B. (2016). Resisted Sled Sprint Training to Improve Sprint Performance: A Systematic Review. Sports Med, 46(3), 381-400.

Scanlan, A., Dascombe, B., & Reaburn, P. (2011). A comparison of the activity demands of elite and sub-elite Australian men's basketball competition. J Sports Sci, 29(11), 1153-1160.

Shalfawi, S., Enoksen, E., Tønnessen, E., & Ingebrigtsen, J. (2012). Assessing the test-retest reliability of the portable Brower Speed Trap II testing system. Kinesiology, 11(1), 24-30.

Sierer, S., Battaglini, C., Mihalik, J., Shields, E., & Tomasini, N. (2008). The National Football League Combine: Performance Differences Between Drafted and Nondrafted Players Entering the 2004 and 2005 Drafts. J Strength Cond Res, 22(1), 6-12.

Spencer, M., Lawrence, S., Rechichi, C., Bishop, D., Dawson, B., & Goodman, C. (2004). Time–motion analysis of elite field hockey, with special reference to repeated-sprint activity. J Sports Sci, 22(9), 843-850.

Till, K., Cobley, S., O’Hara, J., Brightmore, A., Cooke, C., & Chapman, C. (2011). Using anthropometric and performance characteristics to predict selection in junior UK Rugby League players. J Sci Med Sport, 14(3), 264-269.

Tønnessen, E., Shalfawi, S., Haugen, T., & Enoksen, E. (2011). The Effect of 40-m Repeated Sprint Training on Maximum Sprinting Speed, Repeated Sprint Speed Endurance, Vertical Jump, and Aerobic Capacity in Young Elite Male Soccer Players. J Strength Cond Res, 25(9), 2364-2370.

Upton, D. (2011). The Effect of Assisted and Resisted Sprint Training on Acceleration and Velocity in Division IA Female Soccer Athletes. J Strength Cond Res, 25(10), 2645-2652.

Weir, J. (2005). Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM. J Strength Cond Res, 19(1), 231-240.

West, D., Cunningham, D., Bracken, R. et al. (2013). Effects of Resisted Sprint Training on Acceleration in Professional Rugby Union Players. J Strength Cond Res, 27(4), 1014-1018.


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How to Cite

Godwin, M., Matthews, J., Stanhope, E., & Richards, K. (2021). Intra and intersession reliability of the Run RocketTM in recreationally trained participants. Journal of Human Sport and Exercise, 16(1), 53–62.



Performance Analysis of Sport