PMID- 24912198
OWN - NLM
STAT- MEDLINE
DCOM- 20150218
LR  - 20141219
IS  - 1555-0265 (Print)
IS  - 1555-0265 (Linking)
VI  - 10
IP  - 1
DP  - 2015 Jan
TI  - Effect of knee and trunk angle on kinetic variables during the isometric midthigh 
      pull: test-retest reliability.
PG  - 58-63
LID - 10.1123/ijspp.2014-0077 [doi]
AB  - The isometric midthigh pull (IMTP) has been used to monitor changes in force, 
      maximum rate of force development (mRFD), and impulse, with performance in this 
      task being associated with performance in athletic tasks. Numerous postures have 
      been adopted in the literature, which may affect the kinetic variables during the 
      task; therefore, the aim of this investigation was to determine whether different 
      knee-joint angles (120 degrees , 130 degrees , 140 degrees , and 150 degrees ) and hip-joint angles (125 degrees  and 
      145 degrees ), including the subjects preferred posture, affect force, mRFD, and impulse 
      during the IMTP. Intraclass correlation coefficients demonstrated high 
      within-session reliability (r >/= .870, P < .001) for all kinetic variables 
      determined in all postures, excluding impulse measures during the 130 degrees  
      knee-flexion, 125 degrees  hip-flexion posture, which showed a low to moderate 
      reliability (r = .666-.739, P < .001), while between-sessions testing 
      demonstrated high reliability (r > .819, P < .001) for all kinetic variables. 
      There were no significant differences in peak force (P > .05, Cohen d = 0.037, 
      power = .408), mRFD (P > .05, Cohen d = 0.037, power = .409), or impulse at 100 
      ms (P > .05, Cohen d = 0.056, power = .609), 200 ms (P > .05, Cohen d = 0.057, 
      power = .624), or 300 ms (P > .05, Cohen d = 0.061, power = .656) across 
      postures. Smallest detectable differences demonstrated that changes in 
      performance of >1.3% in peak isometric force, >10.3% in mRFD, >5.3% in impulse at 
      100 ms, >4.4% in impulse at 200 ms, and >7.1% in impulse at 300 ms should be 
      considered meaningful, irrespective of posture.
FAU - Comfort, Paul
AU  - Comfort P
AD  - Directorate of Sport, Exercise and Physiotherapy, University of Salford, Salford, 
      UK.
FAU - Jones, Paul A
AU  - Jones PA
FAU - McMahon, John J
AU  - McMahon JJ
FAU - Newton, Robert
AU  - Newton R
LA  - eng
PT  - Journal Article
DEP - 20140606
PL  - United States
TA  - Int J Sports Physiol Perform
JT  - International journal of sports physiology and performance
JID - 101276430
SB  - IM
MH  - Exercise Test
MH  - Hip Joint/*physiology
MH  - Humans
MH  - Isometric Contraction/*physiology
MH  - Kinetics
MH  - Knee Joint/*physiology
MH  - Male
MH  - Physical Education and Training
MH  - Posture/*physiology
MH  - Reproducibility of Results
MH  - Sports/physiology
EDAT- 2014/06/10 06:00
MHDA- 2015/02/19 06:00
CRDT- 2014/06/10 06:00
PHST- 2014/06/10 06:00 [entrez]
PHST- 2014/06/10 06:00 [pubmed]
PHST- 2015/02/19 06:00 [medline]
AID - 2014-0077 [pii]
AID - 10.1123/ijspp.2014-0077 [doi]
PST - ppublish
SO  - Int J Sports Physiol Perform. 2015 Jan;10(1):58-63. doi: 10.1123/ijspp.2014-0077. 
      Epub 2014 Jun 6.