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:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The analysis of the kinetic responses of heart rate (HR) and oxygen consumption (VO(2)) 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 VO(2) 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 VO(2) 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 VO(2) kinetics were higher in the moderate compared to the mild exercise intensity.
CONCLUSION: We concluded that the elderly group presented with slower HR and VO(2) 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; Thomas Beltrame; Aparecida M Catai; Ross Arena; Audrey Borghi-Silva
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-11-02
Journal Detail:
Title:  Brazilian journal of physical therapy     Volume:  17     ISSN:  1809-9246     ISO Abbreviation:  Braz J Phys Ther     Publication Date:    2013 Jan-Feb
Date Detail:
Created Date:  2013-03-29     Completed Date:  2014-03-10     Revised Date:  2014-05-02    
Medline Journal Info:
Nlm Unique ID:  101615124     Medline TA:  Braz J Phys Ther     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  69-76     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Aged, 80 and over
Aging / physiology*
Cross-Sectional Studies
Exercise / physiology*
Exercise Test / methods
Heart Rate / physiology*
Humans
Kinetics
Male
Middle Aged
Oxygen Consumption / physiology*
Prospective Studies
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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