Abstract
Abstract Aim: This study aims to investigate the concordance between two cycle ergometers for variables measured in the test of maximum incremental effort. Methods: This correlation study enrolled 15 inactive women (19,2 ± 4,0 years old). At random, the participants performed two maximal effort incremental tests (MEIT), using cycle ergometers (Keiser-M3 and Ergo-167) on different days with a minimum interval of 72 hours. The test had stages of two minutes, and two-step increments were carried out at the end of each stage. Lactate concentration ([LAC]), and rated perceived exertion (RPE) were collected, in addition to monitoring oxygen uptake (VO2) and heart rate (HR). The Paired t-test was carried out to compare physiologic variables, Lin's test was used for correlation, and Bland Altman was used to measuring concordances among variables. Results: The correlations between physiologic parameters were considered strong for HR on the anaerobic threshold (Keiser M3 = 146 ± 14 bpm; Ergo-167 = 149 ± 9 bpm; r = 0.762), greater blood lactate value (Keiser M3 = 9,97 ± 2,51 mmol/L; Ergo-167 = 9.71 ± 2.56 mmol/L; r = 0.820), VO2max (Keiser M3 = 38,37 ± 6,97 mL/kg/min; Ergo-167 = 36.06 ± 8.4 mL/kg/min; r = 0,806) and HRmax (Keiser M3 = 186 ± 53 bpm; Ergo-167 = 188 ± 11 bpm; r = 0.716). Conclusion: The results show the feasibility of using the cycle ergometer Keiser, model M3, to perform the maximal effort incremental test, whereas there was high concordance in the physiologic responses in both ergometers for inactive women.
Highlights
Incremental tests were performed in different contexts since clinical and functional variables measured at rest are not capable to adequately identify an individual's ability to perform physical exercises[1,2]
The samples were collected at the biochemistry and exercise physiology laboratory at the Federal University of Pelotas (UFPel) with controlled temperature and humidity at 21° and 60%, respectively, and in each session, the participants performed maximal effort incremental tests (MEIT) in different cycle ergometers in random order and counterbalanced
The main findings indicate the following: i) there is a concordance between cardiac results obtained from HRmax and in the anaerobic threshold identification using heart rate (HR) during the test; ii) there is a strong concordance between the ergometers for [LAC]peak variable; iii) a strong correlation between bicycles used for VO2max measurements was found; iv) the MEIT protocol, elaborated for tests in Keiser ergometer, is efficient when the aim is maximal physiologic measurements of HR, [LAC], VO2 and rating of perceived exertion (RPE)
Summary
Incremental tests were performed in different contexts since clinical and functional variables measured at rest are not capable to adequately identify an individual's ability to perform physical exercises[1,2]. The results from these tests are used to obtain relevant information to the prevention and treatment of pathological conditions[3], as well as for prescribing and understanding the physiological adjustments associated with physical training[4]. Among the most usual physiological measures related to exercise, there are those associated with lactacidemic responses, given their relevance in the prescription of exercise intensity in cyclic sport modalities with aerobic predominance[11]. The first ventilatory threshold is recommended as a submaximal physiologic index and has been used to determine functional measures, prescription, and training intensity control[17], mainly due to its non-invasive characteristic[18]
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