Agreement analysis between critical power and intensity corresponding to 50%  in cycling exercise

Souza, Kristopher Mendes de; Lucas, Ricardo Dantas de; Salvador, Paulo Cesar do Nascimento; Helal, Lucas; Guglielmo, Luiz Guilherme Antonacci; Greco, Camila Coelho

doi:10.5007/1980-0037.2016v18n2p197

Cited by 3 publications

(3 citation statements)

References 29 publications

(47 reference statements)

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“…On separate days, 2 tests until exhaustion (TE) were performed, in random order, at an intensity corresponding to the Δ50%, determined as the speed corresponding to 50% between the first lactate threshold and the MAS. It is important to highlight that this intensity was chosen because it considers both the lactate threshold and the V̇ o 2 max to normalize exercise intensity (20), and it is very close to the critical power intensity (11). The experimental protocol was conducted as follows: (a) subject preparation (skin preparation and electrode placement); (b) standardized warm-up period; (c) 2 or 3 MVCs (5% of variation was tolerated) of the knee extensors muscles with superimposed doublet (100 Hz) and potentiated twitch evoked 2 seconds after the MVC, separated by 2 minutes; (d) running warm-up; (e) caffeinated chewing gum intake; (f) running until exhaustion; and (g) after MVCs of the knee extensors muscles with superimposed doublet (100 Hz) and twitch evoked 2 seconds after the MVC, separated by 1 minute.…”

Section: Methodsmentioning

confidence: 99%

“…On separate days, 2 tests until exhaustion (TE) were performed, in random order, at an intensity corresponding to the D50%, determined as the speed corresponding to 50% between the first lactate threshold and the MAS. It is important to highlight that this intensity was chosen because it considers both the lactate threshold and the V _ O 2 max to normalize exercise intensity (20), and it is very close to the critical power intensity (11) after MVCs of the knee extensors muscles with superimposed doublet (100 Hz) and twitch evoked 2 seconds after the MVC, separated by 1 minute.…”

Section: Experimental Approach To the Problemmentioning

confidence: 99%

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Effects of Caffeine Chewing Gum on Exercise Tolerance and Neuromuscular Responses in Well-Trained Runners

Dittrich

Serpa²,

Lemos³

et al. 2021

Journal of Strength and Conditioning Research

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Dittrich, N, Serpa, MC, Lemos, EC, De Lucas, RD, and Guglielmo, LGA. Effects of caffeine chewing gum on exercise tolerance and neuromuscular responses in well-trained runners. J Strength Cond Res 35(6): 1671–1676, 2021—This study aimed to investigate the effects of caffeinated chewing gum on endurance exercise, neuromuscular properties, and rate of perceived exertion on exercise tolerance. Twelve trained male runners (31.3 ± 6.4 years; 70.5 ± 6.6 kg; 175.2 ± 6.2 cm; 9.4 ± 2.7% body fat; and V̇o 2max = 62.0 ± 4.2 ml·kg−1·min−1) took part of the study. The athletes performed an intermittent treadmill test to determine maximal aerobic speed and delta 50% (Δ50%) intensity. In the following visits, they performed 2 randomized time to exhaustion tests (15.4 ± 0.7 km·h−1) after the ingestion of 300 mg of caffeine in a double-blind, crossover, randomized design. Maximal voluntary contraction of the knee extensor associated to surface electromyographic recording and the twitch interpolation technique were assessed before and immediately after the tests to quantify neuromuscular fatigue of the knee extensor muscles. Caffeine significantly improved exercise tolerance by 18% (p < 0.01). Neuromuscular responses decreased similarly after time to exhaustion in both exercise conditions; however, athletes were able to run a longer distance in the caffeine condition. The performance improvement induced by caffeine seems to have a neuromuscular contribution because athletes were able to run a longer distance with the same neuromuscular impairment.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Approach To the Problemmentioning

confidence: 99%

Effects of Caffeine Chewing Gum on Exercise Tolerance and Neuromuscular Responses in Well-Trained Runners

Dittrich

Serpa²,

Lemos³

et al. 2021

Journal of Strength and Conditioning Research

View full text Add to dashboard Cite

show abstract

“…The Δ50% exercise intensity was calculated by defining GET-VO 2 and VO 2 max, and then adding 50% of the difference between them to GET-VO 2 . After this, we made an interpolation using the linear regression model with the equation of a VO 2 /intensity relationship (Souza et al, 2016), in order to determine the Δ50% workload.…”

Section: Methodsmentioning

confidence: 99%

Thigh Ischemia-Reperfusion Model Does Not Accelerate Pulmonary VO2 Kinetics at High Intensity Cycling Exercise

et al. 2019

Self Cite

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Background: We aimed to investigate the effect of a priming ischemia-reperfusion (IR) model on the kinetics of pulmonary oxygen uptake (VO 2 ) and cardiopulmonary parameters after high-intensity exercise. Our primary outcome was the overall VO 2 kinetics and secondary outcomes were heart rate (HR) and O 2 pulse kinetics. We hypothesized that the IR model would accelerate VO 2 and cardiopulmonary kinetics during the exercise. Methods: 10 recreationally active men (25.7 ± 4.7 years; 79.3 ± 10.8 kg; 177 ± 5 cm; 44.5 ± 6.2 mL kg −1 min −1 ) performed a maximal incremental ramp test and four constant load sessions at the midpoint between ventilatory threshold and VO 2 max on separate days: two without IR (CON) and two with IR (IR). The IR model consisted of a thigh bi-lateral occlusion for 15 min at a pressure of 250 mmHg, followed by 3 min off, before high-intensity exercise bouts. Results: There were no significant differences for any VO 2 kinetics parameters (VO 2 base 1.08 ± 0.08 vs. 1.12 ± 0.06 L min −1 ; P = 0.30; τ = 50.1 ± 7.0 vs. 47.9 ± 6.4 s; P = 0.47), as well as for HR (MRT 180s 67.3 ± 6.0 vs. 71.3 ± 6.1 s; P = 0.54) and O 2 pulse kinetics (MRT 180s 40.9 ± 3.9 vs. 48.2 ± 5.6 s; P = 0.31) between IR and CON conditions, respectively. Conclusion: We concluded that the priming IR model used in this study had no influence on VO 2 , HR, and O 2 pulse kinetics during high-intensity cycling exercise.

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Biological and methodological factors affecting response variability to endurance training and the influence of exercise intensity prescription

Meyler

Bottoms

Muniz‐Pumares

2021

Experimental Physiology

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Changes in cardiorespiratory fitness (CRF) in response to endurance training (ET) exhibit large variations, possibly due to a multitude of biological and methodological factors. It is acknowledged that ∼20% of individuals may not achieve meaningful increases in CRF in response to ET. Genetics, the most potent biological contributor, has been shown to explain ∼50% of response variability, whilst age, sex and baseline CRF appear to explain a smaller proportion. Methodological factors represent the characteristics of the ET itself, including the type, volume and intensity of exercise, as well as the method used to prescribe and control exercise intensity. Notably, methodological factors are modifiable and, upon manipulation, alter response rates to ET, eliciting increases in CRF regardless of an individual's biological predisposition.Particularly, prescribing exercise intensity relative to a physiological threshold (e.g., ventilatory threshold) is shown to increase CRF response rates compared to when intensity is anchored relative to a maximum physiological value (e.g., maximum heart rate). It is, however, uncertain whether the increased response rates are primarily attributable to reduced response variability, greater mean changes in CRF or both.Future research is warranted to elucidate whether more homogeneous chronic adaptations manifest over time among individuals, as a result of exposure to more homogeneous exercise stimuli elicited by threshold-based practices.

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Agreement analysis between critical power and intensity corresponding to 50% in cycling exercise

Cited by 3 publications

References 29 publications

Effects of Caffeine Chewing Gum on Exercise Tolerance and Neuromuscular Responses in Well-Trained Runners

Effects of Caffeine Chewing Gum on Exercise Tolerance and Neuromuscular Responses in Well-Trained Runners

Thigh Ischemia-Reperfusion Model Does Not Accelerate Pulmonary VO2 Kinetics at High Intensity Cycling Exercise

Biological and methodological factors affecting response variability to endurance training and the influence of exercise intensity prescription

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