Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
©Journal of Sports Science and Medicine (2021) 20, 357 - 364   DOI:

Research article
Reliability of Sprint Force-Velocity-Power Profiles Obtained with KiSprint System
Nejc Šarabon1,2,3,4, , Žiga Kozinc1,2, Amador Garcia Ramos5,6, Olivera M. Knežević7, Milan Čoh8, Dragan M. Mirkov9
Author Information
1 University of Primorska, Faculty of Health Sciences, Slovenia
2 University of Primorska, Andrej Marušič Institute, Slovenia
3 InnoRenew CoE, Human Health Department, Slovenia
4 S2P, Science to practice, Ltd., Laboratory for Motor Control and Motor Behavior, Slovenia
5 Faculty of Sport Sciences, University of Granada, Spain
6 Faculty of Education, Universidad Católica de la Santísima Concepción, Chile
7 Institute for Medical Research, University of Belgrade, Serbia
8 Faculty of Sport, Ljubljana, University of Ljubljana, Slovenia
9 Faculty of Sport and Physical Education, University of Belgrade, Serbia

Nejc Šarabon
✉ University of Primorska, Faculty of Health Sciences, Polje 42, SI-6310 Izola, Slovenia
Publish Date
Received: 14-01-2021
Accepted: 29-03-2021
Published (online): 05-04-2021
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This study aimed to assess the within- and between-session reliability of the KiSprint system for determining force-velocity-power (FVP) profiling during sprint running. Thirty (23 males, 7 females; 18.7 ± 2.6 years;) young high-level sprinters performed maximal effort sprints in two sessions separated by one week. Split times (5, 10, 20 and 30 m), which were recorded with a laser distance meter (a component of the KiSprint system), were used to determine the horizontal FVP profile using the Samozino’s field-based method. This method assesses the FVP relationships through estimates of the step-averaged ground reaction forces in sagittal plane during sprint acceleration using only anthropometric and spatiotemporal (split times) data. We also calculated the maximal theoretical power, force and velocity capabilities and the slope of the FV relationship, the maximal ratio of horizontal-to-resultant force (RF), and the decrease in the RF (DRF). Overall, the results showed moderate or good to excellent within- and between-session reliability for all variables (ICC > 0.75; CV < 10 %), with the exception of FV slope and DRF that showed low relative reliability (ICC = 0.47-0.48 within session, 0.31-0.33 between-session) and unacceptable between-session absolute reliability values (CV = 10.9-11.1 %). Future studies are needed to optimize the protocol in order to maximize the reliability of the FVP variables, especially when practitioners are interested in the FV slope and DRF. In summary, our results question the utility of the sprint-based FVP profiling for individualized training prescription, since the reliability of the FV slope and D RF variables is highly questionable.

Key words: Acceleration, horizontal force, force-velocity relationship, sprinters

           Key Points
  • This study showed moderate to excellent within- and between-session reliability for sprint split times (5, 10, 20 and 30 m) and most variables related to force-velocity profiling in sprint running (F0, V0, Pmax).
  • Unacceptable lower reliability was shown for force-velocity profile (i.e. the slope of the profile) and the coefficient of decrease in the ratio between horizontal and total force throughout the trial.
  • Future studies are needed to optimize the protocol in order to maximize the reliability of the force-velocity variables.
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