PMID- 28958069
OWN - NLM
STAT- MEDLINE
DCOM- 20190509
LR  - 20190509
IS  - 1758-535X (Electronic)
IS  - 1079-5006 (Linking)
VI  - 73
IP  - 5
DP  - 2018 Apr 17
TI  - The Influence of Age, Joint Angle, and Muscle Group on Strength Production 
      Characteristics at the Knee Joint.
PG  - 603-607
LID - 10.1093/gerona/glx156 [doi]
AB  - The current understanding of age-related declines in muscle strength capacities 
      is largely based upon strength testing at joint angles of optimal performance, 
      but many activities of daily living involve force generation at muscle 
      lengths/angles outside of optimal force. This study investigated the influence of 
      age, joint angle, and muscle group (knee extensors and flexors) on maximal and 
      rapid strength characteristics. Young (n = 21; age = 22.1 years) and older (23; 
      72.6 years) adults performed maximal voluntary contractions for the knee 
      extensors and flexors at 20 degrees , 60 degrees , and 90 degrees  joint angles. Peak torque (PT) and 
      rate of torque development (RTD) were calculated. An age, angle, and muscle 
      interaction was found for PT, revealing differences for the knee flexors at all 
      three joint angles for the older adults, whereas the young adults were similar 
      between the 20 degrees  and 60 degrees  angles. The later RTD variable showed an age and muscle 
      group interaction, whereas no interactions were found for early RTD. The angle of 
      strength testing for maximal strength (PT) of the knee flexors showed dissimilar 
      changes in strength characteristics for young versus older adults across joint 
      angles. For later RTD variables, the testing angle was a more prominent factor 
      for the knee extensors, but less so for the flexors.
FAU - Thompson, Brennan J
AU  - Thompson BJ
AD  - Neuromuscular Research Laboratory, Department of Kinesiology and Health Science, 
      Utah State University, Logan.
FAU - Whitson, Morgan
AU  - Whitson M
AD  - Human Performance Laboratory, Department of Kinesiology and Sport Management, 
      Texas Tech University, Lubbock.
FAU - Sobolewski, Eric J
AU  - Sobolewski EJ
AD  - Department of Health Sciences, Furman University, Greenville, South Carolina.
FAU - Stock, Matt S
AU  - Stock MS
AD  - Applied Physiology Laboratory, Department of Health Professions, University of 
      Central Florida, Orlando.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Gerontol A Biol Sci Med Sci
JT  - The journals of gerontology. Series A, Biological sciences and medical sciences
JID - 9502837
SB  - IM
MH  - Activities of Daily Living
MH  - Aged
MH  - Aging/*physiology
MH  - Female
MH  - Humans
MH  - Knee Joint/*physiology
MH  - Male
MH  - Muscle Strength/*physiology
MH  - Torque
MH  - Young Adult
EDAT- 2017/09/29 06:00
MHDA- 2019/05/10 06:00
CRDT- 2017/09/29 06:00
PHST- 2017/06/01 00:00 [received]
PHST- 2017/08/08 00:00 [accepted]
PHST- 2017/09/29 06:00 [pubmed]
PHST- 2019/05/10 06:00 [medline]
PHST- 2017/09/29 06:00 [entrez]
AID - 4082430 [pii]
AID - 10.1093/gerona/glx156 [doi]
PST - ppublish
SO  - J Gerontol A Biol Sci Med Sci. 2018 Apr 17;73(5):603-607. doi: 
      10.1093/gerona/glx156.