The Influence of Countermovement Jump Protocol on Reactive Strength Index Modified and Flight Time: Contraction Time in Collegiate Basketball Players

Heishman, Aaron; Brown, Brady; Daub, Bryce; Miller, Ryan; Freitas, Eduardo; Bemben, Michael

doi:10.3390/sports7020037

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The Influence of Countermovement Jump Protocol on Reactive Strength Index Modified and Flight Time: Contraction Time in Collegiate Basketball Players

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Department of Health and Exercise Science, University of Oklahoma, Norman, OK 73019, USA

Department of Athletics, Basketball Strength and Performance, University of Oklahoma, Norman, OK 73019, USA

Author to whom correspondence should be addressed.

Sports 2019, 7(2), 37; https://doi.org/10.3390/sports7020037

Received: 23 January 2019 / Revised: 2 February 2019 / Accepted: 10 February 2019 / Published: 12 February 2019

(This article belongs to the Special Issue Physical Performance in Team Sports)

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Abstract

The purpose of the present investigation was to evaluate differences in Reactive Strength Index Modified (RSI_Mod) and Flight Time to Contraction Time Ratio (FT:CT) during the countermovement jump (CMJ) performed without the arm swing (CMJNAS) compared to the CMJ with the arm swing (CMJAS), while exploring the relationship within each variable between jump protocols. A secondary purpose sought to explore the relationship between RSI_Mod and FT:CT during both jump protocols. Twenty-two collegiate basketball players performed both three CMJNAS and three CMJAS on a force plate, during two separate testing sessions. RSI_Mod was calculated by the flight-time (RSI_Mod^FT) and impulse-momentum methods (RSI_Mod^IMP). CMJ variables were significantly greater during the CMJAS compared to CMJNAS (p < 0.001). There were large to very large correlations within each variable between the CMJAS and CMJNAS. There were significant positive correlations among RSI_Mod^FT, RSI_Mod^IMP, and FT:CT during both the CMJAS (r ≥ 0.864, p < 0.001) and CMJNAS (r ≥ 0.960, p < 0.001). These findings identify an increase in RSI_Mod or FT:CT during the CMJAS, that may provide independent information from the CMJNAS. In addition, either RSI_Mod or FT:CT may be utilized to monitor changes in performance, but simultaneous inclusion may be unnecessary. View Full-Text

Keywords: athlete monitoring; athlete performance; collegiate basketball; fatigue monitoring; countermovement jump; CMJ arm swing; CMJ without arm swing

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Heishman, A.; Brown, B.; Daub, B.; Miller, R.; Freitas, E.; Bemben, M. The Influence of Countermovement Jump Protocol on Reactive Strength Index Modified and Flight Time: Contraction Time in Collegiate Basketball Players. Sports 2019, 7, 37. https://doi.org/10.3390/sports7020037

AMA Style

Heishman A, Brown B, Daub B, Miller R, Freitas E, Bemben M. The Influence of Countermovement Jump Protocol on Reactive Strength Index Modified and Flight Time: Contraction Time in Collegiate Basketball Players. Sports. 2019; 7(2):37. https://doi.org/10.3390/sports7020037

Chicago/Turabian Style

Heishman, Aaron, Brady Brown, Bryce Daub, Ryan Miller, Eduardo Freitas, and Michael Bemben. 2019. "The Influence of Countermovement Jump Protocol on Reactive Strength Index Modified and Flight Time: Contraction Time in Collegiate Basketball Players" Sports 7, no. 2: 37. https://doi.org/10.3390/sports7020037

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The Influence of Countermovement Jump Protocol on Reactive Strength Index Modified and Flight Time: Contraction Time in Collegiate Basketball Players

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