Electromyographic, Mechanomyographic, And Metabolic Responses During Cycle Ergometry At A Constant Rating Of Perceived Exertion.

2015 ◽  
Vol 47 ◽  
pp. 787
Author(s):  
Kristen Cochrane ◽  
Terry Housh ◽  
Nathaniel D.M. Jenkins ◽  
Haley C. Bergstrom ◽  
Cory M. Smith ◽  
...  
Keyword(s):  
Perceived Exertion ◽  
Cycle Ergometry ◽  
Rating Of Perceived Exertion ◽  
Metabolic Responses

Effect of ENDUROX™ on Metabolic Responses to Submaximal Exercise

1999 ◽  
Vol 9 (4) ◽  
pp. 434-442 ◽  
Author(s):  
Samuel N. Cheuvront ◽  
Robert J. Moffatt ◽  
Kyle D. Biggerstaff ◽  
Shawn Bearden ◽  
Paul McDonough
Keyword(s):  
Oxygen Consumption ◽  
Repeated Measures ◽  
Perceived Exertion ◽  
Minute Ventilation ◽  
Rating Of Perceived Exertion ◽  
Peak Oxygen Consumption ◽  
Metabolic Responses ◽  
Double Blind ◽  
Serum Glycerol ◽  
Male Subjects

Claims that ENDUROX™ enhances performance by altering metabolic responses to exercise were tested. In a double-blind crossover design, 10 male subjects were randomly assigned to consume 400 mg of placebo or 800 mg ENDUROX™ for 7 days. Cycle ergometry was performed for 30 minutes at 25%, followed by 10 min at 65% of peak oxygen consumption. After a 1-week washout period, subjects performed the identical exercise protocol following 7 days of reciprocal supplemental conditions. Expired gases were collected and analyzed continuously for oxygen consumption, minute ventilation, and respiratory exchange ratio. Heart rate, blood pressure, rating of perceived exertion, blood lactate, and serum glycerol data were also collected at regular intervals. A two-way ANOVA with repeated measures revealed no significant main or interaction effects involving group differences (p > 0.05) between trials for any variable during rest, 25% or 65% (VO2 peak), or recovery. Our findings do not support the ergogenic claims for ENDUROX™.

scholarly journals The Effect of Static and Dynamic Stretching during Warm-Up on Running Economy and Perception of Effort in Recreational Endurance Runners

2021 ◽  
Vol 18 (16) ◽  
pp. 8386
Author(s):  
Emanuela Faelli ◽  
Marco Panascì ◽  
Vittoria Ferrando ◽  
Ambra Bisio ◽  
Luca Filipas ◽  
...  
Keyword(s):  
Perceived Exertion ◽  
Endurance Performance ◽  
Running Economy ◽  
Rating Of Perceived Exertion ◽  
Metabolic Responses ◽  
Endurance Running ◽  
Warm Up ◽  
Perception Of Effort ◽  
Recreational Runners ◽  
Endurance Runners

This randomized crossover counterbalanced study investigated, in recreational runners, the acute effects of pre-exercise stretching on physiological and metabolic responses, endurance performance, and perception of effort. Eight male endurance runners (age 36 ± 11 years) performed three running-until-exhaustion tests, preceded by three warm-ups, including the following different stretching protocols: static (SS), dynamic (DS), and no-stretching (NS). During the SS and DS sessions, the warm-up consisted of 10 min of running plus 5 min of SS or DS, respectively, while during the NS session, the warm-up consisted of 15 min of running. Physiological and metabolic responses, and endurance running performance parameters, were evaluated. The perception of effort was derived from the rating of perceived exertion (RPE). Running economy significantly improved after SS (p < 0.05) and DS (p < 0.01), and RPE values were significantly lower in SS (p < 0.05) and DS (p < 0.01), compared to NS. No differences in physiological and metabolic responses among the sessions were found. This study showed that including SS and DS within the warm-up ameliorated running economy and decreased the perception of effort during a running-until-exhaustion test, highlighting the benefits of stretching on endurance performance. These results should encourage recreational runners to insert stretching during warm-up, to optimize the running energy costs, reducing the perception of effort and making the training sessions more enjoyable.

Exercise Regulation during Cycle Ergometry Using the Children’s Effort Rating Table (CERT) and Rating of Perceived Exertion (RPE) Scales

1996 ◽  
Vol 8 (4) ◽  
pp. 337-350 ◽  
Author(s):  
Kevin L. Lamb
Keyword(s):  
Perceived Exertion ◽  
Cycle Ergometry ◽  
Rating Of Perceived Exertion ◽  
Objective Measures ◽  
Validity And Reliability ◽  
Specific Exercise ◽  
Perceived Effort ◽  
Rest Periods ◽  
Intraclass Correlations ◽  
Effort Rating

This study examined the validity and reliability of the Rating of Perceived Exertion (RPE) scale and the Children’s Effort Rating Table (CERT) as methods of regulating exercise intensity during discontinuous cycle ergometry. Sixty-four school children (ages 9–10) were randomly assigned to one of two groups, RPE or CERT, and received two trials 7 days apart. On both occasions, subjects produced 4 × 4-min scale-specific exercise intensities—3, 5, 7, and 9 (CERT) or 8, 12, 15, and 18 (RPE)—interspersed with 2-min rest periods. Analyses yielded significant (p < .01) correlations between perceived effort levels and objective measures: r = .47 to .61 (heart rate) and r = .59 to .75 (power output). Intraclass correlations indicated satisfactory overall repeatability of the produced exercise intensities (R > .70), but some notable inconsistencies were observed. The usefulness of effort perception scales among preadolescent children is presently rather limited, probably due to a number of confounding factors that need to be systematically addressed.

Children’s Ratings of Effort during Cycle Ergometry: An Examination of the Validity of Two Effort Rating Scales

1995 ◽  
Vol 7 (4) ◽  
pp. 407-421 ◽  
Author(s):  
Kevin L. Lamb
Keyword(s):  
Perceived Exertion ◽  
Rating Scales ◽  
Cycle Ergometry ◽  
Rating Of Perceived Exertion ◽  
Perceived Effort ◽  
Intraclass Correlations ◽  
Group 2 ◽  
Power Outputs ◽  
Pearson Correlations ◽  
Effort Rating

This study assessed and compared the validity of children’s effort ratings using the established Borg 6–20 Rating of Perceived Exertion (RPE) scale and a recently devised Children’s Effort Rating Table (CERT) during continuous cycle ergometry. Seventy school children were randomly assigned to one of two groups: Group 1 (RPE) and Group 2 (CERT). Both groups received two incremental exercise trials (Trial 1 and Trial 2) 7 days apart. For both scales, data analysis yielded significant (p < .01) Pearson correlations between perceived effort ratings and heart rate (HR) (rs ≥ .50) and perceived effort and absolute power outputs (rs ≥ .59). Moreover, correlations for CERT were consistently higher than for RPE. Test-retest intraclass correlations of R = .91 (CERT) and R = .90 (RPE) revealed that both scales were reliable. These data suggest that among preadolescent children the traditional scale (RPE) is not the only, nor indeed the best, option for monitoring perceived exertion during controlled exercise.

Electromyographic, mechanomyographic, and metabolic responses during cycle ergometry at a constant rating of perceived exertion

2015 ◽  
Vol 40 (11) ◽  
pp. 1178-1185 ◽  
Author(s):  
Kristen C. Cochrane ◽  
Terry J. Housh ◽  
Nathaniel D.M. Jenkins ◽  
Haley C. Bergstrom ◽  
Cory M. Smith ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Consumption Rate ◽  
Perceived Exertion ◽  
Consumption Rate ◽  
Polynomial Regression ◽  
Vastus Lateralis ◽  
Cycle Ergometry ◽  
Rating Of Perceived Exertion ◽  
Peak Oxygen Consumption ◽  
Mean Power

Ten subjects performed four 8-min rides (65%–80% peak oxygen consumption) to determine the physical working capacity at the OMNI rating of perceived exertion (RPE) threshold (PWCOMNI). Polynomial regression analyses were used to examine the patterns of responses for surface electromyographic (EMG) amplitude (EMG AMP), EMG mean power frequency (EMG MPF), mechanomyographic (MMG) AMP, and MMG MPF of the vastus lateralis as well as oxygen consumption rate, respiratory exchange ratio (RER), and power output (PO) were examined during a 1-h ride on a cycle ergometer at a constant RPE that corresponded to the PWCOMNI. EMG AMP and MMG MPF tracked the decreases in oxygen consumption rate, RER, and PO, while EMG MPF and MMG AMP tracked RPE. The decreases in EMG AMP and MMG MPF were likely attributable to decreases in motor unit (MU) recruitment and firing rate, while the lack of change in MMG AMP may have resulted from a balance between MU de-recruitment as PO decreased, and an increase in the ability of activated fibers to oscillate. The current findings suggested that during submaximal cycle ergometry at a constant RPE, MU de-recruitment and mechanical changes within the muscle may influence the perception of effort via feedback from group III and IV afferents.

scholarly journals Physiological responses and cycle characteristics during double-poling versus diagonal-stride roller-skiing in junior cross-country skiers

2021 ◽  
Author(s):  
Erik P. Andersson ◽  
Irina Hämberg ◽  
Paulo Cesar Do Nascimento Salvador ◽  
Kerry McGawley
Keyword(s):  
Oxygen Uptake ◽  
Perceived Exertion ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Peak Oxygen Uptake ◽  
Submaximal Exercise ◽  
Rating Of Perceived Exertion ◽  
Time To Exhaustion ◽  
Double Poling ◽  
Cross Country

Abstract Purpose This study aimed to compare physiological factors and cycle characteristics during cross-country (XC) roller-skiing at matched inclines and speeds using the double-poling (DP) and diagonal-stride (DS) sub-techniques in junior female and male XC skiers. Methods Twenty-three well-trained junior XC skiers (11 women, 12 men; age 18.2 ± 1.2 yr.) completed two treadmill roller-skiing tests in a randomized order using either DP or DS. The exercise protocols were identical and included a 5 min warm-up, 4 × 5 min submaximal stages, and an incremental test to exhaustion, all performed at a 5° incline. Results No significant three-way interactions were observed between sex, submaximal exercise intensity, and sub-technique. For the pooled sample, higher values were observed for DP versus DS during submaximal exercise for the mean oxygen uptake kinetics response time (33%), energy cost (18%), heart rate (HR) (9%), blood lactate concentration (5.1 versus 2.1 mmol·L−1), rating of perceived exertion (12%), and cycle rate (25%), while cycle length was lower (19%) (all P < 0.001). During the time-to-exhaustion (TTE) test, peak oxygen uptake ($$\dot{V}$$ V ˙ O2peak), peak HR, and peak oxygen pulse were 8%, 2%, and 6% lower, respectively, for DP than DS, with a 29% shorter TTE during DP (pooled data, all P < 0.001). Conclusion In well-trained junior XC skiers, DP was found to exert a greater physiological load than DS during uphill XC roller-skiing at submaximal intensities. During the TTE test, both female and male athletes were able to ski for longer and reached markedly higher $$\dot{V}$$ V ˙ O2peak values when using DS compared to DP.

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