Test–retest reliability of second lactate turnpoint using two different criteria in competitive cyclists

Hoefelmann, Camila Peter; Diefenthaeler, Fernando; Costa, Vitor Pereira; Lucas, Ricardo Dantas de; Shambrook, Philip; Guglielmo, Luiz Guilherme Antonacci

doi:10.1080/17461391.2014.944874

Cited by 12 publications

(7 citation statements)

References 48 publications

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“…The time course of [La] vs. work rates was graphically interpolated and LT 2 was determined using the IAT methodology, i. e. 1.5 mmol.L − 1 above the point of minimum ratio between [La] and work rate [12]. The agreement between IAT and MLSS as well as IAT reliability has been described elsewhere [10,17]. HR, VO 2 and RPE at IAT were also identified by linear interpolation between two segments.…”

Section: Graded Exercise Testmentioning

confidence: 99%

“…Specifically, no study has compared FTP against the individual anaerobic threshold (IAT). We have previously shown that IAT agrees more with MLSS than other LT methods [10] and presents high intraindividual reliability [17], suggesting this method could be a more robust measure to test the validity of FTP. Alternatively, a time to exhaustion (TTE) at FTP 20 could provide further evidence for the validity of the concept, but, to our knowledge, this evidence has not been published yet.…”

Section: Introductionmentioning

confidence: 99%

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Functional Threshold Power in Cyclists: Validity of the Concept and Physiological Responses

et al. 2018

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Functional threshold power is defined as the highest power output a cyclist can maintain in a quasi-steady state for approximately 60 min (FTP). In order to improve practicality for regular evaluations, FTP could theoretically be determined as 95% of the mean power output in a 20-min time trial (FTP). This study tested this assumption and the validity of FTP and FTP against the individual anaerobic threshold (IAT). Twenty-three trained male cyclists performed an incremental test to exhaustion, 20- and 60-min time trials, and a time to exhaustion at FTP. Power output, heart rate and oxygen uptake representing FTP, FTP and IAT were not different (p>0.05), and large to very large correlations were found (r=0.61 to 0.88). Bland-Altman plots between FTP, FTP and IAT showed small bias (-1 to -5 W), but large limits of agreement ([-40 to 32 W] to [-62 to 60 W]). Time to exhaustion at FTP was 50.9±15.7 min. In conclusion, FTP and FTP should not be used interchangeably on an individual basis and their validity against IAT should be interpreted with caution.

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Section: Graded Exercise Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functional Threshold Power in Cyclists: Validity of the Concept and Physiological Responses

et al. 2018

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“…The maximum and the lactate threshold were assessed, using the same test, on the SRM cycle ergometer (SRM Italia, Lucca, Italy) with the same settings (height and fore-aft position of the seat, height and distance of the handlebar, and length of the pedal crankarms) and the same type of bicycle pedals for each subject. The original incremental protocol to exhaustion to determine maximum calls for a minimum of five and a maximum of nine 4-minute stages, each with resistance increments between a minimum of 20 and a maximum of 50 watts [ 26 ] and has been found to be highly reliable for the lactate threshold assessment in cyclists [ 27 ]. Although the protocol called for an intensity of 40% of maximum for the first stage, we decided to use 30% in light of the fact that to determine the lactate threshold, the blood concentration of lactate at the end of the first stage should not be significantly higher than the resting value [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of water-based recovery on blood lactate removal after high-intensity exercise

et al. 2017

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This study assessed the effectiveness of water immersion to the shoulders in enhancing blood lactate removal during active and passive recovery after short-duration high-intensity exercise. Seventeen cyclists underwent active water- and land-based recoveries and passive water and land-based recoveries. The recovery conditions lasted 31 minutes each and started after the identification of each cyclist’s blood lactate accumulation peak, induced by a 30-second all-out sprint on a cycle ergometer. Active recoveries were performed on a cycle ergometer at 70% of the oxygen consumption corresponding to the lactate threshold (the control for the intensity was oxygen consumption), while passive recoveries were performed with subjects at rest and seated on the cycle ergometer. Blood lactate concentration was measured 8 times during each recovery condition and lactate clearance was modeled over a negative exponential function using non-linear regression. Actual active recovery intensity was compared to the target intensity (one sample t-test) and passive recovery intensities were compared between environments (paired sample t-tests). Non-linear regression parameters (coefficients of the exponential decay of lactate; predicted resting lactates; predicted delta decreases in lactate) were compared between environments (linear mixed model analyses for repeated measures) separately for the active and passive recovery modes. Active recovery intensities did not differ significantly from the target oxygen consumption, whereas passive recovery resulted in a slightly lower oxygen consumption when performed while immersed in water rather than on land. The exponential decay of blood lactate was not significantly different in water- or land-based recoveries in either active or passive recovery conditions. In conclusion, water immersion at 29°C would not appear to be an effective practice for improving post-exercise lactate removal in either the active or passive recovery modes.

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“…The test was interrupted when the cyclist was unable to maintain the cadence for more than 5 seconds or stopped voluntarily. Previous study 25 have suggested a variation of the 2.6% in ICT performance, using fixed methods. Besides is a test well-established and often used in research 3,11,26 , the psychophysiological variables evaluated by ICT are highly correlated with cycling performance 26 .…”

Section: Incremental Cycling Test (Ict)mentioning

confidence: 99%

Ischemic preconditioning delays the time of exhaustion in cycling performance during the early but not in the late phase

Arriel

Souza

Silva

et al. 2019

Motriz: rev. educ. fis.

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Aims: To investigate the early and late ischemic preconditioning (IPC) effect on the trained cyclists' performance during incremental cycling test until exhaustion. Methods: Twenty-one male cyclists allocated to an IPC (2 x 5-min of blood flow occlusion at 50 mm Hg above systolic pressure followed + 5-min of deflation), SHAM (2 x 5-min at 20 mm Hg) or control (CON; no occlusion) interventions, performed three incremental cycling test (ICT) until exhaustion on separate days. The ICT were conducted pre interventions (baseline), 5-min and 24-h after interventions. The heart rate (HR) and power output (PO) were recorded during all ICT. Results: The IPC group increased ICT performance (4.4 ± 4.0 %; effect size (ES) = 0.27) 5-min post intervention, accompanied by HR mean reduction, compared to baseline (p < 0.05). However, there were no changes in SHAM (2.2 ± 4.2%; ES = 0.07) and CON (2.9 ± 5.0%; ES = 0.06) groups. In 24-h post intervention, SHAM (0.2 ± 4.7%; ES = 0.02) and CON (-1.0 ±1.6; ES = 0.03) maintained (p > 0.05) and IPC group decreased the performance (-4.6 ± 3.6 %; ES = 0.16) compared to 5-min post intervention (p < 0.05), but all groups were similar to baseline (p > 0.05). There were no difference (p > 0.05) among groups for PO peak, HR and ICT performance in all moments (baseline, 5-min and 24-h post intervention). Conclusion: The IPC increases early but not late incremental cycling test performance.

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Test–retest reliability of second lactate turnpoint using two different criteria in competitive cyclists

Cited by 12 publications

References 48 publications

Functional Threshold Power in Cyclists: Validity of the Concept and Physiological Responses

Functional Threshold Power in Cyclists: Validity of the Concept and Physiological Responses

Effect of water-based recovery on blood lactate removal after high-intensity exercise

Ischemic preconditioning delays the time of exhaustion in cycling performance during the early but not in the late phase

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