| Full text | |
| Author(s): |
Rodrigo P Simões
[1]
;
José C Bonjorno Jr
[2]
;
Thomas Beltrame
[3, 4]
;
Aparecida M Catai
[3]
;
Ross Arena
[5, 6]
;
Audrey Borghi-Silva
[3]
Total Authors: 6
|
| Affiliation: | [1] Universidade Federal de São Carlos (UFSCar). Nucleus of Research in Physical Exercise. Cardiopulmonary Physical Therapy Laboratory - Brasil
[2] Universidade de São Paulo (USP). Bioengineering Post-Graduation - Brasil
[3] Univ Fed Sao Carlos, Cardiopulm Phys Therapy Lab, Sao Carlos, SP - Brazil
[4] Univ Waterloo, Fac Appl Hlth Sci, Waterloo, ON - Canada
[5] Univ New Mexico, Latin Amer & Iberian Inst, Albuquerque, NM 87131 - USA
[6] Univ New Mexico, Dept Internal Med, Dept Orthopaed, Phys Therapy Program, Div Cardiol, Albuquerque, NM 87131 - USA
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | BRAZILIAN JOURNAL OF PHYSICAL THERAPY; v. 17, n. 1, p. 69-76, 2012-11-02. |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 09/01842-0 - Analysis of central and peripheral muscle metabolism and adjustments on dynamic versus resistance exercise in coronary arterial disease patients: effects of resistance physical training program based on anaerobic threshold by different methodologies |
| Grantee: | Audrey Borghi Silva |
| Support Opportunities: | Research Grants - Young Investigators Grants |