Reliability of identifying lactate threshold by use of visual method
DOI:
https://doi.org/10.11606/issn.2317-0190.v18i1a103488Keywords:
Lactic Acid, Anaerobic Threshold, Exercise, WomenAbstract
The lactate threshold (LT) is used as a marker for metabolic acidosis and represents the time during the exercise in which blood lactate begins to increase exponentially. LT has been used as a measurer of physical capacity, a sensitive indicator of the state of aerobic training in healthy and sick patients, in addition, assists in identifying the optimal training stimulus and the prescription of training intensity. The aim of this study was to evaluate the reliability, intra and interrater, of the LT obtained by a visual detection method. For this, 31 female volunteers (67.50 ± 4.41 years, 1.52 ± 0.07 m, 64.55 ± 11.46 kg), apparently healthy and postmenopausal, participated in the study. The LT was determined from a test performed on a treadmill, which consisted of stages with progressive workload (variation of speed and/or incline), until the patient experienced fatigue. Blood samples were collected from a finger prick of the middle finger every 3 minutes during the test. Next, the visual detection method graphics were constructed (software Prisma5) from the blood lactate concentra-tion collected at each stage of exercise (3 minute intervals) depending on the work rate corresponding to oxygen consumption (VO2) estimated during the treadmill test. Statistical analysis was performed by the intraclass correlation coefficient (ICC). Intrarater reliability was excellent (0.950 - 0.952) and interrater reliability was good (0.789 - 0.770). Thus, it has been determined that the visual detection method is a safe and reliable way to detect the LT in clinical practice and research.
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