PMID- 26534723
OWN - NLM
STAT- MEDLINE
DCOM- 20160808
LR  - 20181113
IS  - 1574-4647 (Electronic)
IS  - 0161-9152 (Print)
IS  - 0161-9152 (Linking)
VI  - 37
IP  - 6
DP  - 2015 Dec
TI  - Effects of age and muscle action type on acute strength and power recovery 
      following fatigue of the leg flexors.
PG  - 111
LID - 10.1007/s11357-015-9845-2 [doi]
LID - 111
AB  - Short-term strength and power recovery patterns following fatigue have received 
      little research attention, particularly as they pertain to age-specific 
      responses, and the leg flexors (i.e., hamstrings) muscle group. Thus, research is 
      warranted addressing these issues because both age-related alterations in the 
      neuromuscular system and mode of muscle action (e.g., eccentric, concentric, 
      isometric) may differentially influence recovery responses from fatigue. The aim 
      of this study was to investigate the strength and power recovery responses for 
      eccentric, concentric, and isometric muscle actions of the leg flexors in young 
      and older men following an isometric, intermittent fatigue-inducing protocol. 
      Nineteen young (age = 25 +/- 3 years) and nineteen older (71 +/- 4) men performed 
      maximal voluntary contractions (MVCs) for eccentric, concentric, and isometric 
      muscle actions followed by a fatigue protocol of intermittent (0.6 duty cycle) 
      isometric contractions of the leg flexors at 60% of isometric MVC. MVCs of each 
      muscle action were performed at 0, 7, 15, and 30 min following fatigue. Peak 
      torque (PT) and mean power values were calculated from the MVCs and the 
      eccentric/concentric ratio (ECR) was derived. For PT and mean power, young men 
      showed incomplete recovery at all time phases, whereas the older men had 
      recovered by 7 min. Eccentric and isometric muscle actions showed incomplete 
      recovery at all time phases, but concentric recovered by 7 min, independent of 
      age. The ECR was depressed for up to 30 min following fatigue. More rapid and 
      pronounced recovery in older men and concentric contractions may be related to 
      physiological differences specific to aging and muscle action motor unit 
      patterns. Individuals and clinicians may use these time course responses as a 
      guide for recovery following activity-induced fatigue.
FAU - Thompson, Brennan J
AU  - Thompson BJ
AD  - Neuromuscular Research Laboratory, Department of Kinesiology and Health Sciences, 
      Utah State University, Logan, UT, USA. brennan.thompson@usu.edu.
FAU - Conchola, Eric C
AU  - Conchola EC
AD  - Applied Musculoskeletal and Human Physiology Research Laboratory, Oklahoma State 
      University, Stillwater, OK, USA.
FAU - Stock, Matt S
AU  - Stock MS
AD  - Human Performance Laboratory, Texas Tech University, Lubbock, TX, USA.
LA  - eng
PT  - Journal Article
DEP - 20151103
PL  - Netherlands
TA  - Age (Dordr)
JT  - Age (Dordrecht, Netherlands)
JID - 101250497
SB  - IM
MH  - Adult
MH  - Age Factors
MH  - Aged
MH  - Exercise/*physiology
MH  - Humans
MH  - Leg/*physiology
MH  - Male
MH  - Muscle Contraction/physiology
MH  - Muscle Fatigue/*physiology
MH  - Muscle Strength/*physiology
MH  - Muscle, Skeletal/*physiology
MH  - Torque
PMC - PMC5005847
OTO - NOTNLM
OT  - Concentric
OT  - Eccentric
OT  - Elderly
OT  - Hamstrings
OT  - Isometric
OT  - Low frequency fatigue
COIS- Compliance with ethical standards Informed consent All participants completed and 
      signed an informed consent document and health history questionnaire prior to any 
      testing.
EDAT- 2015/11/05 06:00
MHDA- 2016/08/09 06:00
PMCR- 2016/12/01
CRDT- 2015/11/05 06:00
PHST- 2015/05/25 00:00 [received]
PHST- 2015/10/14 00:00 [accepted]
PHST- 2015/11/05 06:00 [entrez]
PHST- 2015/11/05 06:00 [pubmed]
PHST- 2016/08/09 06:00 [medline]
PHST- 2016/12/01 00:00 [pmc-release]
AID - 10.1007/s11357-015-9845-2 [pii]
AID - 9845 [pii]
AID - 10.1007/s11357-015-9845-2 [doi]
PST - ppublish
SO  - Age (Dordr). 2015 Dec;37(6):111. doi: 10.1007/s11357-015-9845-2. Epub 2015 Nov 3.