Document Detail


Slower heart rate and oxygen consumption kinetic responses in the on- and off-transient during a discontinuous incremental exercise: effects of aging.
MedLine Citation:
PMID:  23117650     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: The analysis of the kinetic responses of heart rate (HR) and oxygen consumption (VO2) are an important tool for the evaluation of exercise performance and health status. OBJECTIVES: The purpose of this study was to investigate the effects of aging on the HR and VO2 kinetics during the rest-exercise transition (on-transient) and the exercise-recovery transition (off-transient), in addition to investigating the influence of exercise intensity (mild and moderate) on these variables. METHOD: A total of 14 young (23±3 years) and 14 elderly (70±4 years) healthy men performed an incremental exercise testing (ramp protocol) on a cycle-ergometer to determine the maximal power (MP). Discontinuous exercise testing was initiated at 10% of the MP with subsequent increases of 10% until exhaustion. The measurement of HR, ventilatory and metabolic variables and blood lactate were obtained at rest and during the discontinuous exercise. RESULTS: The lactate threshold was determined in each subject and was similar between the groups (30±7% of MP in the young group and 29±5% of MP in the elderly group, p>0.05). The HR and VO2 kinetics (on- and off-transient) were slower in the elderly group compared to the young group (p<0.05). Additionally, in the young group, the values of HR and VO2 kinetics were higher in the moderate compared to the mild exercise intensity. CONCLUSION: We concluded that the elderly group presented with slower HR and VO2 kinetics in relation to the young group for both on- and off-transients of the dynamic exercise. Moreover, in the young group, the kinetic responses were slower in the moderate intensity in relation to the mild intensity.
Authors:
Rodrigo P Simões; José C Bonjorno Jr; Thomas Beltrame; Aparecida M Catai; Ross Arena; Audrey Borghi-Silva
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-02
Journal Detail:
Title:  Revista brasileira de fisioterapia (Sao Carlos (Sao Paulo, Brazil))     Volume:  -     ISSN:  1809-9246     ISO Abbreviation:  Rev Bras Fisioter     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101186153     Medline TA:  Rev Bras Fisioter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Cardiopulmonary Physical Therapy Laboratory, Nucleus of Research in Physical Exercise, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, Brazil.
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