PMID- 30682903
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20191120
IS  - 1555-0273 (Electronic)
IS  - 1555-0265 (Linking)
VI  - 14
IP  - 4
DP  - 2019 Apr 1
TI  - Effect of Sampling Frequency on Isometric Midthigh-Pull Kinetics.
PG  - 525-530
LID - 10.1123/ijspp.2019-2015-0222 [doi]
AB  - PURPOSE: Skeletal-muscle function can be evaluated using force-times curves 
      generated via the isometric midthigh pull (IMTP). Various sampling frequencies 
      (500-1000 Hz) have been used for IMTP assessments; however, no research has 
      investigated the influence of sampling frequency on IMTP kinetics. Therefore, the 
      purpose of this study was to investigate the influence of sampling frequency on 
      kinetic variables during the IMTP, including peak force, time-specific force 
      values (100, 150, and 200 ms), and rate of force development (RFD) at 3 time 
      bands (0-100, 0-150, 0-200 ms). METHODS: Academy rugby league players (n = 30, 
      age 17.5 +/- 1.1 y, height 1.80 +/- 0.06 m, mass 85.4 +/- 10.3 kg) performed 3 IMTP 
      trials on a force platform sampling at 2000 Hz, which was subsequently 
      down-sampled to 1500, 1000, and 500 Hz for analysis. RESULTS: Intraclass 
      correlation coefficients (ICC) and coefficients of variation (CV) demonstrated 
      high within-session reliability for all force and RFD variables across all 
      sampling frequencies (ICC >/= .80, CV </= 14.4%) except RFD 0-100 and 0-150, which 
      demonstrated slightly greater levels of variance (CV = 18.0-24.1%). 
      Repeated-measures analysis of variance revealed no significant differences 
      (P > .05, Cohen d </= 0.0171) in kinetic variables between sampling frequencies. 
      Overall, high reliability was observed across all sampling frequencies for peak 
      force, time-specific force, and RFD 0- to 200-ms variables, with no significant 
      differences (P > .05) for each kinetic variable across sampling frequencies. 
      CONCLUSIONS: Practitioners and scientists may consider sampling as low as 500 Hz 
      when measuring peak force, time-specific force values, and RFD at predetermined 
      time bands during the IMTP for accurate and reliable data.
FAU - Dos'Santos, Thomas
AU  - Dos'Santos T
FAU - Jones, Paul A
AU  - Jones PA
FAU - Kelly, Jonathan
AU  - Kelly J
FAU - McMahon, John J
AU  - McMahon JJ
FAU - Comfort, Paul
AU  - Comfort P
FAU - Thomas, Christopher
AU  - Thomas C
LA  - eng
PT  - Journal Article
DEP - 20190125
PL  - United States
TA  - Int J Sports Physiol Perform
JT  - International journal of sports physiology and performance
JID - 101276430
OTO - NOTNLM
OT  - force-time curve
OT  - peak force
OT  - rate of force development
OT  - reliability
EDAT- 2019/01/27 06:00
MHDA- 2019/01/27 06:01
CRDT- 2019/01/27 06:00
PHST- 2019/01/27 06:00 [pubmed]
PHST- 2019/01/27 06:01 [medline]
PHST- 2019/01/27 06:00 [entrez]
AID - 10.1123/ijspp.2019-2015-0222 [doi]
PST - ppublish
SO  - Int J Sports Physiol Perform. 2019 Apr 1;14(4):525-530. doi: 
      10.1123/ijspp.2019-2015-0222. Epub 2019 Jan 25.