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Article

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

1
Department of Health and Exercise Science, University of Oklahoma, Norman, OK 73019, USA
2
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)
The purpose of the present investigation was to evaluate differences in Reactive Strength Index Modified (RSIMod) 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 RSIMod 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. RSIMod was calculated by the flight-time (RSIModFT) and impulse-momentum methods (RSIModIMP). 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 RSIModFT, RSIModIMP, 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 RSIMod or FT:CT during the CMJAS, that may provide independent information from the CMJNAS. In addition, either RSIMod 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 athlete monitoring; athlete performance; collegiate basketball; fatigue monitoring; countermovement jump; CMJ arm swing; CMJ without arm swing
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MDPI and ACS 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, 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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