PMID- 29333724
OWN - NLM
STAT- MEDLINE
DCOM- 20181218
LR  - 20210109
IS  - 2051-817X (Electronic)
IS  - 2051-817X (Linking)
VI  - 6
IP  - 1
DP  - 2018 Jan
TI  - Voluntary activation and twitch potentiation of the elbow flexors across 
      supinated, neutral, and pronated forearm orientations.
LID - 10.14814/phy2.13560 [doi]
LID - e13560
AB  - Elbow flexion force depends on forearm orientation with supinated and neutral 
      being stronger than pronated. The purpose of this study was to assess the 
      influence of forearm orientation on voluntary activation (VA), postactivation 
      potentiation (PAP), and twitch properties. Eleven males (23 +/- 3 years) performed 
      isometric elbow flexion maximal voluntary contractions (MVC) in supinated, 
      neutral, and pronated forearm orientations with supramaximal stimulation to the 
      biceps brachii muscle belly before, during, and after the MVC. MVC and VA were 
      higher in supinated (213.6 +/- 49.6 N; 93.0 +/- 5.2%) and neutral (243.6 +/- 48.0 N; 
      96.1 +/- 3.2%) compared with pronated (113.6 +/- 21.3 N; 70.9 +/- 20.4%) (P < 0.05), 
      while PAP did not differ across the three orientations (71.6 +/- 42.2%) (P > 0.05). 
      In the rested state, pronated peak tension (PT) was less compared with supinated 
      (42%). In the potentiated state, pronated PT was less than supinated (50%) and 
      neutral (53%) (P < 0.05). Reduced strength in the pronated orientation is 
      partially attributed to reduced drive; however, reductions in peak tension 
      indicate that there also is a mechanical disadvantage when the forearm is placed 
      into a pronated orientation, and this does not alter PAP.
CI  - (c) 2018 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on 
      behalf of The Physiological Society and the American Physiological Society.
FAU - Kohn, Sienna
AU  - Kohn S
AD  - School of Health and Exercise Sciences, Healthy Exercise and Aging Lab Group, 
      University of British Columbia Okanagan, Kelowna, British Columbia, Canada.
FAU - Smart, Rowan R
AU  - Smart RR
AD  - School of Health and Exercise Sciences, Healthy Exercise and Aging Lab Group, 
      University of British Columbia Okanagan, Kelowna, British Columbia, Canada.
FAU - Jakobi, Jennifer M
AU  - Jakobi JM
AUID- ORCID: 0000-0001-8613-7275
AD  - School of Health and Exercise Sciences, Healthy Exercise and Aging Lab Group, 
      University of British Columbia Okanagan, Kelowna, British Columbia, Canada.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Physiol Rep
JT  - Physiological reports
JID - 101607800
SB  - IM
MH  - Adult
MH  - Biomechanical Phenomena
MH  - Elbow/*physiology
MH  - Humans
MH  - *Isometric Contraction
MH  - Male
MH  - Muscle Strength
MH  - Muscle, Skeletal/*physiology
MH  - *Posture
MH  - Random Allocation
PMC - PMC5789656
OTO - NOTNLM
OT  - Biceps brachii
OT  - contractile properties
OT  - force
OT  - strength
EDAT- 2018/01/16 06:00
MHDA- 2018/12/19 06:00
PMCR- 2018/01/15
CRDT- 2018/01/16 06:00
PHST- 2017/09/17 00:00 [received]
PHST- 2017/11/29 00:00 [revised]
PHST- 2017/12/04 00:00 [accepted]
PHST- 2018/01/16 06:00 [entrez]
PHST- 2018/01/16 06:00 [pubmed]
PHST- 2018/12/19 06:00 [medline]
PHST- 2018/01/15 00:00 [pmc-release]
AID - PHY213560 [pii]
AID - 10.14814/phy2.13560 [doi]
PST - ppublish
SO  - Physiol Rep. 2018 Jan;6(1):e13560. doi: 10.14814/phy2.13560.