PMID- 27348269
OWN - NLM
STAT- MEDLINE
DCOM- 20170703
LR  - 20180307
IS  - 1097-4598 (Electronic)
IS  - 0148-639X (Linking)
VI  - 55
IP  - 3
DP  - 2017 Mar
TI  - Influence of age on passive stiffness and size, quality, and strength 
      characteristics.
PG  - 305-315
LID - 10.1002/mus.25231 [doi]
AB  - INTRODUCTION: We examined the effects of aging on passive stiffness, size, 
      quality, and strength characteristics of the posterior hip and thigh muscles. 
      METHODS: Fifteen young (25 +/- 3 years) and 15 old (72 +/- 5 years) men participated 
      in this study. Echo intensity (EI) and cross-sectional area (CSA) were determined 
      from ultrasound scans of the hamstrings. Straight-leg raises were used to assess 
      passive stiffness, which was calculated from the slopes of the initial (phase 1) 
      and final (phase 2) portions of the angle-torque curve. Peak torque (PT) and rate 
      of torque development (RTD) were assessed through maximal voluntary contractions. 
      RESULTS: Phase 2 slope and EI were higher (P </= 0.024), and CSA, PT, and RTD were 
      lower (P </= 0.011) in the old compared with the young men; however, no difference 
      (P = 0.145) was observed for phase 1 slope. CONCLUSIONS: Decreases in muscle 
      quality, as indicated by increases in EI, may contribute to the greater passive 
      stiffness observed in older adults. Muscle Nerve 55: 305-315, 2017.
CI  - (c) 2016 Wiley Periodicals, Inc.
FAU - Palmer, Ty B
AU  - Palmer TB
AD  - Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, 
      Texas, USA.
FAU - Thompson, Brennan J
AU  - Thompson BJ
AD  - Department of Kinesiology and Health Science, Utah State University, Logan, Utah, 
      USA.
LA  - eng
PT  - Journal Article
DEP - 20161128
PL  - United States
TA  - Muscle Nerve
JT  - Muscle & nerve
JID - 7803146
SB  - IM
MH  - Adult
MH  - Aged
MH  - Aging/*physiology
MH  - Electromyography
MH  - Humans
MH  - Isometric Contraction/physiology
MH  - Male
MH  - Muscle Strength/*physiology
MH  - Muscle, Skeletal/diagnostic imaging/*physiology
MH  - Range of Motion, Articular/physiology
MH  - Statistics as Topic
MH  - Stiff-Person Syndrome/diagnostic imaging/*pathology
MH  - Torque
MH  - Ultrasonography
MH  - Young Adult
OTO - NOTNLM
OT  - echo intensity
OT  - falls risk
OT  - hamstrings
OT  - range of motion
OT  - straight-leg raise
OT  - ultrasound
EDAT- 2016/06/28 06:00
MHDA- 2017/07/04 06:00
CRDT- 2016/06/28 06:00
PHST- 2016/02/12 00:00 [received]
PHST- 2016/06/22 00:00 [revised]
PHST- 2016/06/26 00:00 [accepted]
PHST- 2016/06/28 06:00 [pubmed]
PHST- 2017/07/04 06:00 [medline]
PHST- 2016/06/28 06:00 [entrez]
AID - 10.1002/mus.25231 [doi]
PST - ppublish
SO  - Muscle Nerve. 2017 Mar;55(3):305-315. doi: 10.1002/mus.25231. Epub 2016 Nov 28.