PMID- 30787653
OWN - NLM
STAT- MEDLINE
DCOM- 20200225
LR  - 20231005
IS  - 1303-2968 (Electronic)
IS  - 1303-2968 (Linking)
VI  - 18
IP  - 1
DP  - 2019 Mar
TI  - Influence of Sex and Maximum Strength on Reactive Strength Index-Modified.
PG  - 65-72
AB  - Reactive strength index-modified (RSImod) is a measure of lower body 
      explosiveness calculated by dividing jump height by time to takeoff. RSImod is 
      different between stronger and weaker athletes and between males and females. The 
      purpose of this study was to evaluate differences in RSImod between males and 
      females while controlling for maximal strength and lower body explosiveness. 
      Forty-three female and fifty-eight male Division-I athletes performed 
      countermovement jumps on a force plate during unloaded (0kg) and loaded (20kg) 
      conditions. We used an ANCOVA to test whether RSImod is different between sexes 
      conditioning on relative maximum strength (PFa) and average RFD 0-200ms (RFD200) 
      measured during the isometric mid- thigh pull (IMTP). Differences of 0.087 (95% 
      CI: 0.040-0.134; p = 0.0005) and 0.075 (95% CI: 0.040-0.109, p < 0.0001) were 
      observed for RSImod between sexes in unloaded and loaded conditions, 
      respectively. A male with PFa of 186 (grand mean of the sample) and RFD200 of 
      6602 N/s (grand mean of the sample) is predicted to have 28% greater RSImod than 
      a female of similar PFa and RFD200. Maximum strength development should be a 
      primary aim of training in female athletes, in addition to other trainable 
      factors, such as stiffness and RFD.
FAU - Beckham, George K
AU  - Beckham GK
AD  - Department of Kinesiology, California State University, Monterey Bay, Seaside, 
      CA, USA.
FAU - Suchomel, Timothy J
AU  - Suchomel TJ
AD  - Department of Human Movement Sciences, Carroll University, Waukesha, WI, USA.
FAU - Sole, Christopher J
AU  - Sole CJ
AD  - Department of Health and Human Performance, The Citadel, Charleston, SC, USA.
FAU - Bailey, Christopher A
AU  - Bailey CA
AD  - Department of Kinesiology, Health Promotion, and Recreation, University of North 
      Texas, Denton, TX.
FAU - Grazer, Jacob L
AU  - Grazer JL
AD  - School of Health and Human Performance, Georgia College, Milledgeville, GA, USA.
FAU - Kim, Steven B
AU  - Kim SB
AD  - Mathematics and Statistics Department, California State University, Monterey Bay, 
      Seaside, CA, USA.
FAU - Talbot, Kasie B
AU  - Talbot KB
AD  - Mathematics and Statistics Department, California State University, Monterey Bay, 
      Seaside, CA, USA.
FAU - Stone, Michael H
AU  - Stone MH
AD  - Center of Excellence for Sport Science and Coach Education, Department of 
      Exercise and Sport Science, East Tennessee State University, Johnson City, TN, 
      USA.
LA  - eng
PT  - Journal Article
DEP - 20190211
PL  - Turkey
TA  - J Sports Sci Med
JT  - Journal of sports science & medicine
JID - 101174629
SB  - IM
MH  - Female
MH  - Humans
MH  - Lower Extremity/*physiology
MH  - Male
MH  - Muscle Strength/*physiology
MH  - Physical Conditioning, Human
MH  - Plyometric Exercise
MH  - Retrospective Studies
MH  - Sex Factors
MH  - Sports/*physiology
PMC - PMC6370960
OTO - NOTNLM
OT  - Countermovement jump
OT  - isometric mid-thigh pull
OT  - jump technique
OT  - reactive strength
OT  - sex difference
EDAT- 2019/02/23 06:00
MHDA- 2020/02/26 06:00
PMCR- 2019/02/11
CRDT- 2019/02/22 06:00
PHST- 2018/08/25 00:00 [received]
PHST- 2018/11/30 00:00 [accepted]
PHST- 2019/02/22 06:00 [entrez]
PHST- 2019/02/23 06:00 [pubmed]
PHST- 2020/02/26 06:00 [medline]
PHST- 2019/02/11 00:00 [pmc-release]
AID - jssm-18-65 [pii]
PST - epublish
SO  - J Sports Sci Med. 2019 Feb 11;18(1):65-72. eCollection 2019 Mar.