PMID- 25393233
OWN - NLM
STAT- MEDLINE
DCOM- 20150806
LR  - 20191210
IS  - 1555-0265 (Print)
IS  - 1555-0265 (Linking)
VI  - 10
IP  - 5
DP  - 2015 Jul
TI  - Reliability of the Dynamic Strength Index in college athletes.
PG  - 542-5
LID - 10.1123/ijspp.2014-0255 [doi]
AB  - PURPOSE: To determine the reliability of the Dynamic Strength Index (DSI) in 
      college athletes. METHOD: Nineteen male college athletes performed the squat jump 
      (SJ) and isometric midthigh pull (IMTP) to determine peak force, on 2 separate 
      days. Reliability was assessed by intraclass correlation coefficient (ICC), 
      typical error (TE), percentage change in the mean, smallest worthwhile change 
      (SWC), and coefficient of variation (%CV). RESULTS: Peak force for the SJ was 
      2137+/-499 N and 2781+/-435 N for the IMTP, resulting in a mean DSI of 0.78+/-0.19. 
      Peak forces in the SJ (ICC=.99, TE=57.22 N, change in mean=0.2%, SWC=4.7%, 
      CV=2.6%) and IMTP (ICC=.95, TE=104.22 N, change in mean=0.5%, SWC=3.1%, CV=3.8%) 
      were considered highly reliable between sessions. However, IMTP peak force was 
      the only variable with an overall TE<SWC. The DSI was also highly reliable 
      (ICC=.97, TE=0.03, change in mean=-0.3%, SWC=5.1%, CV=4.6%) between sessions. 
      CONCLUSION: This study demonstrates that peak force in the SJ and IMTP are 
      reliable, resulting in a reliable assessment of dynamic-force-production 
      capabilities via the DSI. The DSI may be used to guide individualized training 
      interventions and monitor specific adaptations to training. Changes in SJ peak 
      force, IMTP peak force, and DSI were >4.67%, 3.13%, and 5.13%, respectively, 
      identifying meaningful changes in response to training or competition.
FAU - Thomas, Christopher
AU  - Thomas C
AD  - Directorate of Sport, Exercise and Physiotherapy. University of Salford, Salford, 
      UK.
FAU - Jones, Paul A
AU  - Jones PA
FAU - Comfort, Paul
AU  - Comfort P
LA  - eng
PT  - Journal Article
PT  - Validation Study
DEP - 20141113
PL  - United States
TA  - Int J Sports Physiol Perform
JT  - International journal of sports physiology and performance
JID - 101276430
SB  - IM
MH  - Adult
MH  - *Athletes
MH  - Humans
MH  - Lower Extremity/physiology
MH  - Male
MH  - *Muscle Strength/physiology
MH  - Reproducibility of Results
MH  - Young Adult
EDAT- 2014/11/14 06:00
MHDA- 2015/08/08 06:00
CRDT- 2014/11/14 06:00
PHST- 2014/11/14 06:00 [entrez]
PHST- 2014/11/14 06:00 [pubmed]
PHST- 2015/08/08 06:00 [medline]
AID - 2014-0255 [pii]
AID - 10.1123/ijspp.2014-0255 [doi]
PST - ppublish
SO  - Int J Sports Physiol Perform. 2015 Jul;10(5):542-5. doi: 10.1123/ijspp.2014-0255. 
      Epub 2014 Nov 13.