PMID- 25981878
OWN - NLM
STAT- MEDLINE
DCOM- 20160523
LR  - 20181202
IS  - 1466-447X (Electronic)
IS  - 0264-0414 (Linking)
VI  - 34
IP  - 3
DP  - 2016
TI  - The effects of chronic exercise training status on motor unit activation and 
      deactivation control strategies.
PG  - 199-208
LID - 10.1080/02640414.2015.1046396 [doi]
AB  - This study examined the mechanomyographic (MMGRMS) amplitude-force relationships 
      for 5 (age = 19.20 +/- 0.45 years) aerobically trained (AT), 5 (age = 25 +/- 4.53 
      years) resistance-trained (RT) and 5 (age = 21.20 +/- 2.17 years) sedentary (SED) 
      individuals. Participants performed an isometric trapezoidal muscle action at 60% 
      maximal voluntary contraction of the leg extensors that included linearly 
      increasing, steady force, and linearly decreasing muscle actions. MMG and 
      skinfold thickness were recorded from the vastus lateralis. b and a terms were 
      calculated from the natural log-transformed MMGRMS-force relationships (linearly 
      increasing and decreasing segments) for each participant. An average of MMGRMS 
      was calculated for the entire steady force segment. The b terms for the RT (0.727 
      +/- 0.334) and SED (0.622 +/- 0.281) were significantly greater (P < 0.05) than the 
      AT (0.159 +/- 0.223) and were greater during the linearly increasing (0.622 +/- 
      0.426) than decreasing (0.383 +/- 0.269) segments when collapsed across segments 
      and training status, respectively. MMGRMS during the steady force segment and 
      skinfold thicknesses were not different among training statuses (P = 0.106, P = 
      0.142). Motor unit (MU) activation strategies were influenced as a function of 
      exercise training status and muscle action. Future research is needed to fully 
      understand the implications of these changes in MU control strategies as a result 
      of chronic exercise training on exercise and athletic performance.
FAU - Trevino, Michael A
AU  - Trevino MA
AD  - a Neuromechanics Laboratory, Department of Health, Sport, and Exercise Sciences , 
      University of Kansas , Lawrence , KS , USA.
FAU - Herda, Trent J
AU  - Herda TJ
AD  - a Neuromechanics Laboratory, Department of Health, Sport, and Exercise Sciences , 
      University of Kansas , Lawrence , KS , USA.
LA  - eng
PT  - Journal Article
DEP - 20150518
PL  - England
TA  - J Sports Sci
JT  - Journal of sports sciences
JID - 8405364
SB  - IM
MH  - Electromyography
MH  - Exercise/*physiology
MH  - Humans
MH  - Quadriceps Muscle/*physiology
MH  - *Resistance Training
MH  - Sedentary Behavior
MH  - Skinfold Thickness
MH  - Young Adult
OTO - NOTNLM
OT  - exercise training
OT  - isometric trapezoidal muscle action
OT  - log-transform model
OT  - mechanomyography
OT  - motor unit control strategies
EDAT- 2015/05/20 06:00
MHDA- 2016/05/24 06:00
CRDT- 2015/05/19 06:00
PHST- 2015/05/19 06:00 [entrez]
PHST- 2015/05/20 06:00 [pubmed]
PHST- 2016/05/24 06:00 [medline]
AID - 10.1080/02640414.2015.1046396 [doi]
PST - ppublish
SO  - J Sports Sci. 2016;34(3):199-208. doi: 10.1080/02640414.2015.1046396. Epub 2015 
      May 18.