Efeitos do uso da máscara para análise de gases sobre variáveis fisiológicas e perceptuais máximas e submáximas durante um teste incremental

Abstract

Rev Bras Educ Fís Esporte, (São Paulo) 2016 Jul-Set; 30(3):533-40 • 533 Effects of the use of the mask for gas analysis in the incremental test IntroductionThe effects of the use of the mask for gas analysis on the submaximal and maximal physiological and perceptual variables in response to an incremental test CDD. 20.ed. 796 e maximum aerobic velocity (MAV) predicts running performance of middle and long distance athletes 1-2 . Moreover, it can be used in the control and prescription of exercise training 3 . e MAV represents the minimum velocity associated with the maximum oxygen consumption (VO 2max ) 1 and, it is an indicative of the individual aerobic power.In the 80th and 90th di erent methodologies have been proposed to determine the MAV. However, these methods have resulted in contradictory results (i.e., di erences in velocity values) 9 . Moreover, the protocol selection can in uence this measure [10][11] . N et al. 2 demonstrated that the S et al. 7 method, based on peak velocity (V peak ), performed with an incremental protocol on a treadmill, is capable to predict runners' performance in long distance races (10 to 90 km). Additionally, the authors suggested that muscular factors related to power capacity, and not the cardiovascular system, limited this variable. e use of V peak to monitor athletes' performance during a season has many advantages for coaches and researchers, given that it can be determined without the mask for gas analysis and neither more invasive techniques, such as blood collection (e.g., blood lactate). However, several previous studies have determined the Vpeak with these procedures 2,12 . To the best of authors knowledge, only one study determined the V peak with a "clean" protocol (that is, without the mask) and showed a correlation of 0.89 in a 16 km time-trial 1 . AbstractThis study aimed to determine the effects of using the mask to gas analysis on maximal and submaximal physiological and perceptual variables during an incremental test. We assessed 21 recreationally endurance trained runners (VO 2max : 54.0 ± 7.6 mL·kg -1 ·min -1 ) aged 30 to 49 years. These runners were submitted to two different incremental tests in randomized order to determination of maximum aerobic velocity (MAV), being used in one of them the equipment to gas analysis and not in the other. Peak velocity (V peak ) was determined based on KUIPERS et al. 17 adjustment. It was also analyzed physiological (HR and %HR max ) and perceptual (RPE) variables in each stage to comparison between protocols. Runners did a 10 and 15 km performance in fi eld track to verify the relationship with maximal aerobic speed obtained in both protocols. The use of the mask for gas analysis reduced Vpeak, but did not modify HRmax and RPE max . In regard to submaximal variables, HR was infl uenced mainly in initial stages in which values were higher in the test which the mask was used. However, when expressed as %HR max , runners remained in the majority of submaximal stages in higher percentages during the protocol with mask....

Determination of Maximum Accumulated Oxygen Deficit Using Backward Extrapolation

“…When we evaluate in a fractional way, without the constant use of the gas analysis mask, the increase of the tLim EXTR could be explained by the unrestricted access to ambient air and the lesser sensation of fatigue. Whereas in the tLim C , the use of the mask can theoretically prevent access to O 2 or CO 2 withdrawal as needed, increasing the sensation of fatigue due to increased cardiorespiratory and/ or metabolic stress (i. e. high CV = 18.5 % of [La -] PEAK ) [22][23][24][25]. Thus, it is clear that the increase of the tLim EXTR (more than 3 min) along with low homogeneity of the accumulated VO 2 measurement may have directly influenced the calculation of the MAOD EXTR by adding random errors (low and insignificant ICC, and low homogeneity in the sample TE and CV), compromising its reliability.…”