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A Submaximal Test for the Assessment of Knee Extensor Endurance Capacity.
MedLine Citation:
PMID:  23877376     Owner:  NLM     Status:  Publisher    
PURPOSE: To develop an undemanding test for endurance capacity of the knee extensor muscles, which can also be applied with frail participants. We hypothesized firstly that the first objective indications for peripheral fatigue during incremental unilateral repetitive isometric knee extensor contractions could be used to assess a fatigue threshold (FT), secondly, that torque at FT would depend on training status and thirdly, that this torque could easily be sustained for 30 min.
METHODS: Five trained and five untrained participants performed 5-min-bouts of 60 repetitive contractions (3s on, 2s off). Torque, set at 25%MVC was increased by 5%MVC in subsequent bouts. The highest torque for which rsEMG remained stable during the bout was defined FT. On separate occasions, 30 min bouts were performed at and above FT to assess sustainable torque. Changes in gas exchange parameters, heart rate and ratings of perceived exertion (RPE) were monitored to corroborate fatigue threshold.
RESULTS: At FT (RPE: 5.7±1.7) torque was higher (p<0.05) in trained (41.4±5.8 %MVC) than untrained participants (30.5±1.8 %MVC). Sustainable torque was ∼4% higher than (p<0.05) and significantly related to FT (r=0.79).When torque was increased by 5%MVC, significant increases in rsEMG and VO2 were found.
CONCLUSION: During incremental knee extensor contractions, FT could be assessed at sub maximal exercise intensity. FT was higher in trained than untrained participants and related to exercise sustainability. With the use of FT, changes in endurance capacity of single muscle groups can potentially also be determined in frail participants for whom exercise performed till exhaustion is unwarranted.
Cornelis J de Ruiter; Max I P Mallee; Lara E C Leloup; Arnold de Haan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-7-19
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-7-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
MOVE Research Institute Amsterdam, VU University Amsterdam, The Netherlands.
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