PMID- 29910432
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20240326
IS  - 2075-4663 (Electronic)
IS  - 2075-4663 (Linking)
VI  - 5
IP  - 4
DP  - 2017 Sep 23
TI  - Influence of Dynamic Strength Index on Countermovement Jump Force-, Power-, 
      Velocity-, and Displacement-Time Curves.
LID - 10.3390/sports5040072 [doi]
LID - 72
AB  - The dynamic strength index (DSI), often calculated as the ratio of 
      countermovement jump (CMJ) propulsion peak force to isometric mid-thigh pull 
      (IMTP) peak force, is said to inform whether ballistic or maximal strength 
      training is warranted for a given athlete. CMJ propulsion peak force is highly 
      influenced by jump strategy, however, which is not highlighted by the DSI alone. 
      This study aimed to quantitatively compare CMJ force-, power-, velocity-, and 
      displacement-time curves between athletes who achieved high versus low DSI 
      scores. Fifty-three male collegiate athletes performed three CMJs and IMTPs on a 
      force platform. Athletes were ranked based on DSI score and the CMJ kinetic and 
      kinematic-time curves of the bottom and top twenty athletes were compared. The 
      low DSI group (0.55 +/- 0.10 vs. 0.92 +/- 0.11) produced greater IMTP peak force 
      (46.7 +/- 15.0 vs. 31.1 +/- 6.6 N.kg(-1)) but a larger braking net impulse in the 
      CMJ, leading to greater braking velocity and larger countermovement displacement. 
      This strategy resulted in a similar CMJ propulsion peak force (25.9 +/- 2.2 vs. 
      25.4 +/- 3.1 N.kg(-1)) to the high DSI group. These results, taken together with 
      those of previous studies, support the notion of ballistic versus maximal 
      strength training likely being better suited to low versus high DSI scorers, 
      respectively.
FAU - McMahon, John J
AU  - McMahon JJ
AD  - Directorate of Sport, Exercise and Physiotherapy, University of Salford, 
      Frederick Road, Salford M6 6PU, UK. j.j.mcmahon@salford.ac.uk.
FAU - Jones, Paul A
AU  - Jones PA
AUID- ORCID: 0000-0002-3295-7670
AD  - Directorate of Sport, Exercise and Physiotherapy, University of Salford, 
      Frederick Road, Salford M6 6PU, UK. p.a.jones@salford.ac.uk.
FAU - Dos'Santos, Thomas
AU  - Dos'Santos T
AD  - Directorate of Sport, Exercise and Physiotherapy, University of Salford, 
      Frederick Road, Salford M6 6PU, UK. t.dossantos@hotmail.co.uk.
FAU - Comfort, Paul
AU  - Comfort P
AD  - Directorate of Sport, Exercise and Physiotherapy, University of Salford, 
      Frederick Road, Salford M6 6PU, UK. p.comfort@salford.ac.uk.
LA  - eng
PT  - Journal Article
DEP - 20170923
PL  - Switzerland
TA  - Sports (Basel)
JT  - Sports (Basel, Switzerland)
JID - 101722684
PMC - PMC5969025
OTO - NOTNLM
OT  - athlete monitoring
OT  - ballistic training
OT  - strength training
OT  - temporal phase analysis
COIS- The authors declare no conflict of interest.
EDAT- 2018/06/19 06:00
MHDA- 2018/06/19 06:01
PMCR- 2017/09/23
CRDT- 2018/06/19 06:00
PHST- 2017/08/30 00:00 [received]
PHST- 2017/09/14 00:00 [revised]
PHST- 2017/09/20 00:00 [accepted]
PHST- 2018/06/19 06:00 [entrez]
PHST- 2018/06/19 06:00 [pubmed]
PHST- 2018/06/19 06:01 [medline]
PHST- 2017/09/23 00:00 [pmc-release]
AID - sports5040072 [pii]
AID - sports-05-00072 [pii]
AID - 10.3390/sports5040072 [doi]
PST - epublish
SO  - Sports (Basel). 2017 Sep 23;5(4):72. doi: 10.3390/sports5040072.