PMID- 28933711
OWN - NLM
STAT- MEDLINE
DCOM- 20180409
LR  - 20181202
IS  - 1533-4287 (Electronic)
IS  - 1064-8011 (Linking)
VI  - 31
IP  - 10
DP  - 2017 Oct
TI  - The Effect of Hip Joint Angle on Isometric Midthigh Pull Kinetics.
PG  - 2748-2757
LID - 10.1519/JSC.0000000000002098 [doi]
AB  - The aim of this study were to compare isometric midthigh pull (IMTP) peak force 
      (PF), time-specific force values (100-, 150-, and 200 ms), rate of force 
      development (RFD) at predetermined time bands (0-100, 0-150, and 0-200 ms) and 
      net forces between 2 commonly adopted hip joint angles (145 degrees [hip145] and 
      175 degrees [hip175]) with a 145 degrees  standardized knee angle. Twenty-eight collegiate 
      athletes (age: 21.7 +/- 1.5 years, height: 1.75 +/- 0.08 m, mass: 81.5 +/- 8.4 kg) 
      performed 2 IMTP trials at each hip joint angle in a randomized counterbalanced 
      order. A subgroup (n = 10) performed the IMTP testing 7 days later to establish 
      the between-session reliability. Intraclass correlation coefficients (ICCs) and 
      coefficient of variation (CV) demonstrated high within-session reliability and 
      acceptable variability for all IMTP kinetics at each posture (ICC >/= 0.86, CV </= 
      13.7%), excluding hip175 RFD 0-100 ms and net force at 100 ms which demonstrated 
      greater variability (CV = 18.1-18.5%). High between-session reliability and 
      acceptable variability were observed for all IMTP kinetics at each posture (ICC = 
      0.72-0.97, CV = 4.5-12.8%), excluding RFD 0-100 ms which demonstrated greater 
      variability for both postures. Hip145 produced significantly greater 
      time-specific force values (p </= 0.025, g = 0.25-0.28), RFD at predetermined time 
      bands (p </= 0.001, g = 0.59-0.78), and net forces (p </= 0.001, g = 0.57-0.74) 
      compared with hip175. Trivial nonsignificant differences were demonstrated 
      between postures for PF and force at 100 ms (p > 0.05, g </= 0.14). Significantly 
      greater body weights (weighing period force) were observed with hip175 compared 
      with hip145 (p < 0.001, g = 0.74). Coaches should consider administering a hip145 
      for IMTP testing as greater IMTP kinetics and lower levels of pretension during 
      the weighing period are achieved with this posture.
FAU - Dos'Santos, Thomas
AU  - Dos'Santos T
AD  - Human Performance Laboratory, Directorate of Sport, Exercise, and Physiotherapy, 
      University of Salford, Greater Manchester, United Kingdom.
FAU - Thomas, Christopher
AU  - Thomas C
FAU - Jones, Paul A
AU  - Jones PA
FAU - McMahon, John J
AU  - McMahon JJ
FAU - Comfort, Paul
AU  - Comfort P
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - United States
TA  - J Strength Cond Res
JT  - Journal of strength and conditioning research
JID - 9415084
SB  - IM
MH  - Athletes
MH  - Exercise Test
MH  - Female
MH  - Hip Joint/*physiology
MH  - Humans
MH  - Isometric Contraction/*physiology
MH  - Kinetics
MH  - Knee Joint/physiology
MH  - Male
MH  - Muscle Strength/*physiology
MH  - Observer Variation
MH  - Posture/*physiology
MH  - Reproducibility of Results
MH  - Thigh/*physiology
MH  - Young Adult
EDAT- 2017/09/22 06:00
MHDA- 2018/04/10 06:00
CRDT- 2017/09/22 06:00
PHST- 2017/09/22 06:00 [entrez]
PHST- 2017/09/22 06:00 [pubmed]
PHST- 2018/04/10 06:00 [medline]
AID - 00124278-201710000-00013 [pii]
AID - 10.1519/JSC.0000000000002098 [doi]
PST - ppublish
SO  - J Strength Cond Res. 2017 Oct;31(10):2748-2757. doi: 
      10.1519/JSC.0000000000002098.