Metabolic and performance‐related consequences of exercising at and slightly above <scp>MLSS</scp>

Iannetta, Danilo; Inglis, Erin Calaine; Fullerton, Christopher; Passfield, Louis; Murias, Juan M.

doi:10.1111/sms.13280

Cited by 55 publications

(51 citation statements)

References 43 publications

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“…In this context, the discrepancy between these measures is concerning if trying to use FTP95% as a proxy for MLSS, as previous research has demonstrated that exercising at only 10 W above MLSS profoundly reduces subsequent performance ability (i.e. time to task failure) is substantially reduced 15 .…”

Section: Discussionmentioning

confidence: 99%

Maximal Lactate Steady State Versus the 20-Minute Functional Threshold Power Test in Well-Trained Individuals: “Watts” the Big Deal?

Inglis¹,

Iannetta²,

Passfield³

et al. 2020

International Journal of Sports Physiology and Performance

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Purpose: To (1) compare the power output (PO) for both the 20-minute functional threshold power (FTP20) field test and the calculated 95% (FTP95%) with PO at maximal lactate steady state (MLSS) and (2) evaluate the sensitivity of FTP95% and MLSS to training-induced changes. Methods: Eighteen participants (12 males: 37 [6] y and 6 females: 28 [6] y) performed a ramp-incremental cycling test to exhaustion, 2 to 3 constant-load MLSS trials, and an FTP20 test. A total of 10 participants returned to repeat the test series after 7 months of training. Results: The PO at FTP20 and FTP95% was greater than that at MLSS (P = .00), with the PO at MLSS representing 88.5% (4.8%) and 93.1% (5.1%) of FTP and FTP95%, respectively. MLSS was greater at POST compared with PRE training (12 [8] W) (P = .002). No increase was observed in mean PO at FTP20 and FTP95% (P = .75). Conclusions: The results indicate that the PO at FTP95% is different to MLSS, and that changes in the PO at MLSS after training were not reflected by FTP95%. Even when using an adjusted percentage (ie, 88% rather than 95% of FTP20), the large variability in the data is such that it would not be advisable to use this as a representation of MLSS.

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Section: Discussionmentioning

confidence: 99%

Maximal Lactate Steady State Versus the 20-Minute Functional Threshold Power Test in Well-Trained Individuals: “Watts” the Big Deal?

Inglis¹,

Iannetta²,

Passfield³

et al. 2020

International Journal of Sports Physiology and Performance

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“…[HHb] of the quadriceps vastus lateralis muscle was measured using a frequency‐domain multi‐distance NIRS system (OxiplexTS, Model 92 505; ISS) as described elsewhere . Briefly, the NIRS probe was placed on the belly at the distal portion of the vastus lateralis muscle.…”

Section: Methodsmentioning

confidence: 99%

“…[HHb] of the quadriceps vastus lateralis muscle was measured using a frequency-domain multi-distance NIRS system (OxiplexTS, Model 92 505; ISS) as described elsewhere. 30 Briefly, the NIRS probe was placed on the belly at the distal portion of the vastus lateralis muscle. The probe was secured using a tightened black elastic strap to prevent movement and covered with an optically dense, black vinyl sheet to minimize the intrusion of extraneous light.…”

Section: Data Collectionmentioning

confidence: 99%

Menstrual and oral contraceptive cycle phases do not affect submaximal and maximal exercise responses

Mattu

Iannetta

MacInnis

et al. 2019

Scandinavian Med Sci Sports

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To examine whether the menstrual or monophasic oral contraceptive cycle phases affect submaximal (oxygen uptake (trueV˙O2) kinetics, maximal lactate steady‐state (MLSS)) and maximal (trueV˙O2max, time‐to‐exhaustion (TTE)) responses to exercise in healthy, active women. During the mid‐follicular or inactive‐pill phase and the mid‐luteal or active‐pill phase of the respective menstrual or oral contraceptive cycle, 15 non‐oral contraceptive users (mean and standard deviation (SD) (±): 27 ± 6 years; 171 ± 5 cm; 65 ± 7 kg) and 15 monophasic oral contraceptive users (24 ± 4 years; 169 ± 10 cm; 68 ± 10 kg) performed: one trueV˙O2 kinetics test; one ramp‐incremental test; two to three 30‐minute constant‐load cycling trials to determine the power output corresponding to MLSS (MLSSp), followed by a TTE trial. The phase of the menstrual or oral contraceptive cycle did not affect the time constant of the trueV˙O2 kinetics response (τtrueV˙O2) (mid‐follicular, 20 ± 5 seconds and mid‐luteal, 18 ± 3 seconds; inactive‐pill, 22 ± 8 seconds and active‐pill, 23 ± 6 seconds), trueV˙O2max (mid‐follicular, 3.06 ± 0.32 L min−1 and mid‐luteal, 3.00 ± 0.33 L min−1; inactive‐pill, 2.87 ± 0.39 L min−1 and active‐pill, 2.87 ± 0.45 L min−1), MLSSp (mid‐follicular, 181 ± 30 W and mid‐luteal, 182 ± 29 W; inactive‐pill, 155 ± 26 W and active‐pill, 155 ± 27 W), and TTE (mid‐follicular, 147 ± 42 seconds and mid‐luteal, 128 ± 54 seconds; inactive‐pill, 146 ± 70 seconds and active‐pill, 139 ± 77 seconds) (P > .05). The rate of perceived exertion (RPE) at minute 30 of the MLSSp trials was greater in the mid‐follicular phase (6.2 ± 1.5) compared with the mid‐luteal phase (5.3 ± 1.4) for non‐oral contraceptive users (P = .022). The hormonal fluctuations between the menstrual and oral contraceptive cycle phases had no detectable effects on submaximal and maximal exercise performance, even when RPE differed.

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“…The study design and complete details of all physiological data collected during the experiment have been presented previously 21 . Briefly, participants attended the laboratory for three to five experimental trials, where they performed the following tests:…”

Section: Methodsmentioning

confidence: 99%

“…However,, it is likely that factors other than changes in metabolic and neuromuscular states may also limit performance when exercising at these intensities. Therefore, comparing the effects of exercise at and above MLSS may help to elucidate those factors which influence exercise tolerance 21 . To date, changes in self-efficacy and affective responses during exercise above and below the MLSS, and their association with exercise tolerance have not been characterized.…”

Section: Introductionmentioning

confidence: 99%

Exercise slightly above the maximal lactate steady state reduces self-efficacy and increases negative affect

Wrightson¹,

Passfield²

2019

Preprint

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Objectives: To examine the effect of exercise at and slightly above the maximal lactate steady state (MLSS) on self-efficacy, affect and effort, and their associations with exercise tolerance.Design: Counterbalanced, repeated measures designMethod: Participants performed two 30‐minute constant‐load cycling exercise at a power output equal to that at MLSS and 10 W above MLSS, immediately followed by a time‐to‐exhaustion test at 80% of their peak power output. Self-efficacy, affect and effort were measured before and after 30 minutes of cycling at and above MLSS.Results: Negative affect and effort higher, and self-efficacy and time to exhaustion were reduced, following cycling at MLSS + 10 W compared to cycling at the MLSS. Following exercise at the MLSS self-efficacy, affect and effort were all associated with subsequent time-to exhaustion. However, following exercise at MLSS + 10 W, only affect was associated with time-to exhaustion. Conclusions: Self efficacy, affect and effort are profoundly affected by physiological state, highlighting the influence of somatic states on perceptions and emotions during exercise. The affective response to exercise appears to be associated with exercise tolerance, indicating that the emotional, as well as physiological, responses should be considered when prescribing exercise training.

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Metabolic and performance‐related consequences of exercising at and slightly above MLSS

Cited by 55 publications

References 43 publications

Maximal Lactate Steady State Versus the 20-Minute Functional Threshold Power Test in Well-Trained Individuals: “Watts” the Big Deal?

Maximal Lactate Steady State Versus the 20-Minute Functional Threshold Power Test in Well-Trained Individuals: “Watts” the Big Deal?

Menstrual and oral contraceptive cycle phases do not affect submaximal and maximal exercise responses

Exercise slightly above the maximal lactate steady state reduces self-efficacy and increases negative affect

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