PMID- 32865941
OWN - NLM
STAT- MEDLINE
DCOM- 20210121
LR  - 20210210
IS  - 1533-4287 (Electronic)
IS  - 1064-8011 (Linking)
VI  - 34
IP  - 9
DP  - 2020 Sep
TI  - Isometric Mid-thigh Pull Kinetics: Sex Differences and Response to Whole-Body 
      Vibration.
PG  - 2407-2411
LID - 10.1519/JSC.0000000000003726 [doi]
AB  - Merrigan, JJ, Dabbs, NC, and Jones, MT. Isometric mid-thigh pull kinetics: Sex 
      differences and response to whole-body vibration. J Strength Cond Res 34(9): 
      2407-2411, 2020-The purpose was to investigate whether whole-body vibration's 
      (WBV's) effect on force-time characteristics is dependent on time and sex. 
      Subjects (men, n = 18; women, n = 18) performed a static quarter squat with WBV 
      (frequency: 30 Hz; amplitude: 2-4 mm) and without for 5 x 30 seconds repetitions 
      (1:1, WBV:rest). Next, they performed 2 sets of 3 repetitions of the isometric 
      mid-thigh pull (IMTP) with 3 minutes of intraset rest and 5 minutes of interset 
      rest. Peak force (PF) and rate of force development (RFD) from 0 to 50, 0 to 150, 
      and 0 to 250 milliseconds (RFD50, RFD150, and RFD250) were analyzed (p < 0.05). A 
      significant effect of condition existed for PF (p = 0.019) and RFD from 0 to 250 
      seconds (p = 0.031). In women, RFD was moderately affected immediately post-WBV 
      (p = 0.070; d = 0.49). Yet in men, the effect of WBV on RFD existed 15 minutes 
      after exposure (p = 0.017; d = 0.36). In absolute terms men produced more PF than 
      women (1,008.6 +/- 289.7 N; p < 0.001). All RFD bands were greater in men than 
      those of women (RFD50, 5,519.3 +/- 2,927.2 N.s; RFD150, 3,361.4 +/- 1,385.3 N.s; 
      RFD250, 2,505.7 +/- 867.1 N.s; p < 0.05). However, relative to fat-free mass, PF in 
      men (40.1 +/- 7.2 N.kg) was not different from women (37.7 +/- 6.4 N.kg; p = 0.284). 
      The same was true for RFD150 (21.1 +/- 24.1 N.kg.s; p = 0.084) and RFD250 (10.9 +/- 
      14.1 N.kg.s; p = 0.128). Yet, RFD50 remained greater in men (139.1 +/- 33.6 N.kg.s) 
      than that of women (86.8 +/- 34.5 N.kg.s; p = 0.034). Current WBV protocols 
      resulted in trivial to moderate effects on IMTP forces, which may be dependent on 
      sex and time. Finally, it is recommended that women complete movements with the 
      intent to move weight quickly to improve early RFD.
FAU - Merrigan, Justin J
AU  - Merrigan JJ
AD  - George Mason University, Frank Pettrone Center for Sports Performance, Fairfax 
      Virginia.
AD  - School of Kinesiology, George Mason University, Manassas, Virginia; and.
FAU - Dabbs, Nicole C
AU  - Dabbs NC
AD  - Biomechanics and Sport Performance Laboratory, California State University, San 
      Bernadino, California.
FAU - Jones, Margaret T
AU  - Jones MT
AD  - George Mason University, Frank Pettrone Center for Sports Performance, Fairfax 
      Virginia.
AD  - School of Kinesiology, George Mason University, Manassas, Virginia; and.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Strength Cond Res
JT  - Journal of strength and conditioning research
JID - 9415084
SB  - IM
MH  - Adult
MH  - Cross-Over Studies
MH  - Exercise Test
MH  - Female
MH  - Humans
MH  - Isometric Contraction/*physiology
MH  - Kinetics
MH  - Male
MH  - Muscle Strength/*physiology
MH  - Sex Factors
MH  - Thigh/*physiology
MH  - *Vibration
EDAT- 2020/09/01 06:00
MHDA- 2021/01/22 06:00
CRDT- 2020/09/01 06:00
PHST- 2020/09/01 06:00 [entrez]
PHST- 2020/09/01 06:00 [pubmed]
PHST- 2021/01/22 06:00 [medline]
AID - 00124278-202009000-00001 [pii]
AID - 10.1519/JSC.0000000000003726 [doi]
PST - ppublish
SO  - J Strength Cond Res. 2020 Sep;34(9):2407-2411. doi: 10.1519/JSC.0000000000003726.