Effect of a Reduced-CHO Diet on the Rate of Perceived Exertion Curve During an Incremental Test

2014 ◽  
Vol 24 (5) ◽  
pp. 532-542 ◽  
Author(s):  
Guilherme Assuncao Ferreira ◽  
Raul Osiecki ◽  
Adriano Eduardo Lima-Silva ◽  
Michel Cardoso de Angelis-Pereira ◽  
Fernando Roberto De-Oliveira
Keyword(s):  
Power Output ◽  
Lactate Threshold ◽  
Perceived Exertion ◽  
Control Diet ◽  
Cycle Ergometer ◽  
Incremental Test ◽  
Physically Active ◽  
Rate Of Perceived Exertion ◽  
Short Period ◽  
Proportional Increase

The objective of this study was to evaluate the effect of a reduced-carbohydrate (reduced-CHO) diet on the rate of perceived exertion (RPE) curve during an incremental test. Nine physically active men performed a progressive incremental test on a cycle ergometer (25 W·2 min−1) after 72 hr on either a control diet (60% CHO) or a reduced-CHO diet (30% CHO). Lactate and RPE thresholds were identified using the Dmax method (DmaxLa and DmaxRPE, respectively). Power output, heart rate and RPE scores in DmaxLa and DmaxRPE were similar between the diets and were not different from each other, regardless of the diet. Lactate values were consistently higher (p < .05) in the control diet compared with the reduced-CHO diet during power output after the lactate breakpoint; however, they were not accompanied by a proportional increase in RPE scores. These results suggest that DmaxRPE and DmaxLa are not dissociated after a short-period reduced-CHO diet, whereas the lactate values after the lactate threshold are reduced with a reduced-CHO diet, although they are not accompanied by alterations in RPE.

Identification of training status differences using perceived exertion threshold

2016 ◽  
Vol 41 (4) ◽  
pp. 456-459
Author(s):  
Guilherme A. Ferreira ◽  
Romulo Bertuzzi ◽  
Adriano E. Lima-Silva ◽  
Carlos Malfatti ◽  
Fernando R. De-Oliveira ◽  
...  
Keyword(s):  
Power Output ◽  
Lactate Threshold ◽  
Perceived Exertion ◽  
Training Status ◽  
Physically Active ◽  
Rate Of Perceived Exertion ◽  
Status Differences

We investigated if the rate of perceived exertion (RPE) threshold is as sensitive as the lactate threshold to detect training differences. Lactate and RPE thresholds were identified in well-trained cyclists and physically active males. Power output was higher in well-trained cyclists than in physically active individuals for both thresholds (p < 0.05). Our results suggest that RPE threshold is successful in discriminating differences between well-trained cyclists and physically active individuals.

A Novel Approach for Lactate Threshold Assessment Based on Rating of Perceived Exertion

2013 ◽  
Vol 8 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Nicolas Fabre ◽  
Laurent Mourot ◽  
Livio Zerbini ◽  
Barbara Pellegrini ◽  
Lorenzo Bortolan ◽  
...  
Keyword(s):  
Lactate Threshold ◽  
Perceived Exertion ◽  
Ventilatory Threshold ◽  
Lactate Concentration ◽  
Cycle Ergometer ◽  
Rating Of Perceived Exertion ◽  
Strongly Correlated ◽  
Incremental Test ◽  
Distance Method ◽  
Novel Approach

This study tested the hypothesis that the DMAX (for maximal distance) method could be applied to ratings of perceived exertion (RPE), to propose a novel method for individual detection of the lactate threshold (LT) using RPE alone during an incremental test to exhaustion. Twenty-one participants performed an incremental test on a cycle ergometer. At the end of each stage, lactate concentration was measured and the participants estimated RPE using the Borg CR100 scale. The intensity corresponding to the fixed lactate values of 2 or 4 mmol · L−1(2mM and 4mM), the ventilatory threshold (VT), the respiratory-compensation point (RCP), and the instant of equality of pulmonary gas exchange (RER=1.00) were determined. Lactate (DMAX La) and RPE (DMAX RPE) thresholds were determined using the DMAX method. Oxygen uptake (VO2), heart rate, and power output measured at DMAX RPE and at DMAX La were not statistically different. Bland-Altman plots showed small bias and good agreements when DMAX RPE was compared with the DMAX La and RER=1.00 methods (bias = −0.05% and −2% of VO2max, respectively). Conversely, VO2 from the DMAX RPE method was lower than VO2 at 4 mM and at RCP and was higher than VO2 at 2 mM and at VT. VO2 at DMAX RPE was strongly correlated with VO2 at DMAX La (r = .97), at RER=1.00 (r = .97), at 2 mM (r = .85), at 4 mM (r = .93), at VT (r = .95), and at RCP (r = .95). The combination of the DMAX method with the RPE responses permitted precise and individualized estimates of LT using the DMAX method.

Predicting Lactate Threshold With Rate of Perceived Exertion in Young Competitive Male Swimmers

2021 ◽  
pp. 003151252110052
Author(s):  
Jhonny K. F. da Silva ◽  
Bruna B. Sotomaior ◽  
Carolina F. Carneiro ◽  
Patrick Rodrigues ◽  
Lee Wharton ◽  
...  
Keyword(s):  
Lactate Threshold ◽  
Perceived Exertion ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Test Protocol ◽  
Male Athletes ◽  
Rate Of Perceived Exertion ◽  
Significant Difference ◽  
Maximal Deviation ◽  
Competitive Swimmers

The purpose of this study was to verify the effectiveness of the rate of perceived exertion threshold (RPET) for predicting young competitive swimmers’ lactate threshold (LT) during incremental testing. We enrolled 13 male athletes ( M age = 16, SD = 0.6 years) in an incremental test protocol consisting of eight repetitions of a 100-meter crawl with 2-minute intervals between each repetition. We collected data for blood lactate concentration ([La]) and Borg scale rate of perceived exertion (RPE) at the end of each repetition. The results obtained were: M RPET = 4.98, SD = 1.12 arbitrary units (A.U.) and M lactate threshold = 4.24, SD = 1.12 mmol.L−1, with [La] and RPE identified by the maximal deviation (Dmax) method without a significant difference ( p > 0.05) and large correlations between DmaxLa and DmaxRPE at variables for time (r = 0.64), velocity (r = 0.67) and percentage of personal best time (PB) (r = 0.60). These results suggest that RPET is a good predictor of LT in young competitive swimmers.

scholarly journals Prior exercise impairs subsequent performance in an intensity- and duration-dependent manner

2021 ◽  
Author(s):  
Madison M Fullerton ◽  
Louis Passfield ◽  
Martin J. MacInnis ◽  
Danilo Iannetta ◽  
Juan M Murias
Keyword(s):  
Lactate Threshold ◽  
Peak Power ◽  
Constant Load ◽  
Cycle Ergometer ◽  
Dependent Manner ◽  
Incremental Test ◽  
Subsequent Performance ◽  
Prior Exercise ◽  
Subsequent Time ◽  
Constant Load Exercise

Prior constant-load exercise performed for 30-min at or above maximal lactate steady state (MLSSp) significantly impairs subsequent time-to-task failure (TTF) compared with TTF performed without prior exercise. We tested the hypothesis that TTF would decrease in relation to the intensity and the duration of prior exercise compared to a baseline TTF trial. Eleven individuals (6 men, 5 women, 28 ± 8 yrs) completed the following tests on a cycle ergometer (randomly assigned after MLSSp was determined): i) a ramp-incremental test, ii) a baseline TTF trial performed at 80% of peak power (TTFb), iii) five 30-min constant-PO rides at 5% below lactate threshold (LT-5%), halfway between LT and MLSSp (Delta50), 5% below MLSSp (MLSS-5%), MLSSp, and 5% above MLSSp (MLSS+5%), and iv) 15- and 45-min rides at MLSSp (MLSS15 and MLSS45, respectively). Each condition was immediately followed by a TTF trial at 80% of peak power. Compared to TTFb (330 ± 52s), there was 8.0 ± 24.1, 23.6 ± 20.2, 41.0 ± 14.8, 52.2 ± 18.9, and 75.4 ± 7.4% reduction in TTF following LT-5%, Delta50, MLSS-5%, MLSSp, and MLSS+5%, respectively. Following MLSS15 and MLSS45 there were 29.0 ± 20.1 and 69.4 ± 19.6% reductions in TTF, respectively (P <0.05). It is concluded that TTF is reduced following prior exercise of varying duration at MLSSp and at submaximal intensities below MLSS. Novelty: •Prior constant-PO exercise, performed at intensities below MLSSp, reduces subsequent TTF performance. •Subsequent TTF performance is reduced in a linear fashion following an increase in the duration of constant-PO exercise at MLSSp.

Temperature effects on ventilatory rate, heart rate, and preferred pedal rate during cycle ergometry

1995 ◽  
Vol 79 (3) ◽  
pp. 781-785 ◽  
Author(s):  
F. Leweke ◽  
K. Bruck ◽  
H. Olschewski
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Perceived Exertion ◽  
Sweat Rate ◽  
Cycle Ergometer ◽  
O2 Uptake ◽  
Experimental Time ◽  
Physiological Variables ◽  
Pedal Rate ◽  
Rate Of Perceived Exertion

According to the most customary exercise protocols, core temperature (Tc) rises in parallel with workload (WL) and experimental time. Physiological variables, however, may be related to each of these factors. To investigate effects of WL independent of experimental time and body temperature, we employed four moderate WLs in 4-min steps between 35 and 65% peak O2 uptake (VO2 peak) in randomized order. To investigate independent effects of body temperature, the same work protocol was performed both after resting in comfortable ambient temperature [control test (Cont)] and after a double cold exposure [precooling test (Pret)], where Tc and the temperature set point are decreased by approximately 0.6 and 0.3 degrees C, respectively. Eight male subjects (24 +/- 1.9 yr, VO2 peak 4.9 +/- 0.5 l/min) worked on a cycle ergometer in a climatic chamber. Heart rate (HR) and breathing frequency (BF), but not preferred pedal rate (PR), were positively correlated to Tc, the slopes amounting to 17 and 3.75 min-1/degree C for HR and BF, respectively. The regression appeared linear over the whole temperature range, and the regression lines were not shifted by precooling. PR was increased by time, but Pret-Cont differences of PR and Tc were inversely correlated (r = -0.50, P < 0.01). The effects of WL were highly significant on HR, O2 uptake, and rate of perceived exertion but not on BF, PR, and sweat rate. The relation of rate of perceived exertion to HR was shifted by precooling.

Anaerobic Threshold Prediction Using the OMNI-Walk/Run Scale in Long-Distance Runners: A Preliminary Study

2021 ◽  
Vol 16 (5) ◽  
pp. 727-730
Author(s):  
Yuri de Almeida Costa Campos ◽  
Jeferson M. Vianna ◽  
Miller P. Guimarães ◽  
Hiago L.R. Souza ◽  
Raúl Domínguez ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Anaerobic Threshold ◽  
Lactate Threshold ◽  
Perceived Exertion ◽  
Lactate Concentration ◽  
Rating Of Perceived Exertion ◽  
Distance Runners ◽  
Long Distance ◽  
Incremental Test ◽  
Significant Difference

Purpose: To identify the anaerobic threshold through the lactate threshold determined by Dmax and rating of perceived exertion (RPE) threshold by Dmax and to evaluate the agreement and correlation between lactate threshold determined by Dmax and RPE threshold by Dmax during an incremental test performed on the treadmill in long-distance runners. Methods: A total of 16 long-distance runners volunteered to participate in the study. Participants performed 2 treadmill incremental tests for the collection of blood lactate concentrations and RPE separated by a 48-hour interval. The incremental test started at 8 km·h−1, increasing by 1.2 km·h−1 every third minute until exhaustion. During each stage of the incremental test, there were pauses of 30 seconds for the collection of blood lactate concentration and RPE. Results: No significant difference was found between methods lactate threshold determined by Dmax and RPE threshold by Dmax methods (P = .664). In addition, a strong correlation (r = .91) and agreement through Bland–Altman plot analysis were found. Conclusions: The study demonstrated that it is possible to predict anaerobic threshold from the OMNI-walk/run scale curve through a single incremental test on the treadmill. However, further studies are needed to evaluate the reproducibility and objectivity of the OMNI-walk/run scale for anaerobic threshold determination.

Acute Capsaicin Supplementation Improves 1,500-m Running Time-Trial Performance and Rate of Perceived Exertion in Physically Active Adults

2018 ◽  
Vol 32 (2) ◽  
pp. 572-577 ◽  
Author(s):  
Marcelo Conrado de Freitas ◽  
Jason M. Cholewa ◽  
Luis A. Gobbo ◽  
João V.N.S. de Oliveira ◽  
Fabio S. Lira ◽  
...  
Keyword(s):  
Perceived Exertion ◽  
Time Trial ◽  
Physically Active ◽  
Running Time ◽  
Time Trial Performance ◽  
Rate Of Perceived Exertion ◽  
Active Adults ◽  
Trial Performance

scholarly journals Effects of carbohydrate intake on time to exhaustion and anaerobic contribution during supramaximal exercise

2016 ◽  
Vol 29 (5) ◽  
pp. 691-697 ◽  
Author(s):  
Victor José BASTOS-SILVA ◽  
Sara Kely LEARSI ◽  
Alan de Albuquerque MELO ◽  
Adriano Eduardo LIMA-SILVA ◽  
Gustavo Gomes de ARAUJO
Keyword(s):  
Effect Size ◽  
Power Output ◽  
Constant Load ◽  
Cycle Ergometer ◽  
Maximum Power ◽  
Carbohydrate Intake ◽  
Time To Exhaustion ◽  
Supramaximal Exercise ◽  
Physically Active ◽  
Maximum Power Output

ABSTRACT Objective: This study evaluated the effect of carbohydrate intake on time to exhaustion and anaerobic contribution during supramaximal exercise on a cycle ergometer. Methods: The sample comprised ten participants with a mean age of 23.9±2.5 years, mean body mass of 75.1±12.3 kg, mean height of 170.0±1.0 cm, and mean body fat of 11.3±5.2%. The participants underwent an incremental test to determine maximal oxygen uptake and maximum power output, and two supramaximal tests with a constant load of 110% of the maximum power output to exhaustion. Thirty minutes before the supramaximal tests the participants consumed carbohydrates (2 g.kg-1) or placebo. Results: The times to exhaustion of carbohydrate and placebo did not differ (carbohydrate: 170.7±44.6s; placebo: 156.1±26.7s, p=0.17; effect size=0.39). Similarly, the anaerobic contributions of the two treatments did not differ (carbohydrate: 3.0±0.9 L; placebo: 2.7±1.1 L, p=0.23; effect size=0.29). Conclusion: Carbohydrate intake was not capable of increasing time to exhaustion and anaerobic contribution in physically active men cycling at 110% of maximum power output.

scholarly journals Preexercise Cycling Protocol Alters Pacing Behavior in Competitive Time Trials

2020 ◽  
Vol 15 (9) ◽  
pp. 1303-1308
Author(s):  
Marco J. Konings ◽  
Florentina J. Hettinga
Keyword(s):  
Power Output ◽  
Repeated Measures ◽  
Peak Power ◽  
Perceived Exertion ◽  
Time Trial ◽  
Cycle Ergometer ◽  
Peak Power Output ◽  
Experimental Conditions ◽  
And Performance ◽  
The Impact

Purpose: The behavior of an opponent has been shown to alter pacing and performance. To advance our understanding of the impact of perceptual stimuli such as an opponent on pacing and performance, this study examined the effect of a preexercise cycling protocol on exercise regulation with and without an opponent. Methods: Twelve trained cyclists performed 4 experimental, self-paced 4-km time-trial conditions on an advanced cycle ergometer in a randomized, counterbalanced order. Participants started the time trial in rested state (RS) or performed a 10-min cycling protocol at 67% peak power output (CP) before the time trial. During the time trials, participants had to ride alone (NO) or against a virtual opponent (OP). The experimental conditions were (1) RS-NO, (2) RS-OP, (3) CP-NO, and (4) CP-OP. Repeated-measures analyses of variance (P < .05) were used to examine differences in pacing and performance in terms of power output. Results: A faster pace was adopted in the first kilometer during RS-OP (318 [72] W) compared with RS-NO (291 [81] W; P = .03), leading to an improved finishing time during RS-OP compared with RS-NO (P = .046). No differences in either pacing or performance were found between CP-NO and CP-OP. Conclusions: The evoked response by the opponent to adopt a faster initial pace in the 4-km time trial disappeared when cyclists had to perform a preceding cycling protocol. The outcomes of this study highlight that perceived exertion alters the responsiveness to perceptual stimuli of cyclists during competition.

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