Omni Scale Perceived Exertion Responses In Obese And Normal Weight Male Adolescents During Cycle Exercise

This study compared undifferentiated ratings of perceived exertion (RPE) during short duration, very high intensity cycle exercise using high and low resistance. 30 recreationally trained males (24.2 ± 2.4 yr.) were memory-anchored to the Borg 15-category scale. The high and low resistance exercises were defined by 30-sec. maximum tests assigned in counterbalanced order, with resistances set before testing during an orientation session. High resistance was 10% of body mass. Low resistance resulted in the same total work as the high resistance over the 30-sec. sessions (± 5%) but increased pedal rate. RPE was taken at 8, 13, 18, 23, and 28 sec. during the high and the low resistance exercises. Measurements were compared using a 2-way repeated-measures analysis of variance. RPE was significantly greater ( p = .005) for the high than the low resistance exercise at each interval. RPE increased when the subjects were required to pedal against a greater resistance and produce the highest forces. These RPE data are consistent with data from both aerobic cycle and resistance exercise. The data suggest that instantaneous force production, not summed work, is a primary determinant of RPE. All of these observations support Cafarelli's theoretical model of effort sense. In conclusion, as an individual generates more force during high resistance exercise than in light resistance exercise, a potential explanation of our results is that the increased motor outflow and corollary sensory signal lead to a greater sense of effort.

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Validation of the Italian Version of the Omni Scale of Perceived Exertion in a Sample of Italian-Speaking Adults

Perceptual and Motor Skills ◽

10.2466/06.07.13.27.pms.112.1.201-210 ◽

2011 ◽

Vol 112 (1) ◽

pp. 201-210 ◽

Cited By ~ 2

Author(s):

Laura Guidetti ◽

Marianna Broccatelli ◽

Carlo Baldari ◽

Cosme Franklim Buzzachera ◽

Fredric L. Goss ◽

...

Keyword(s):

Perceived Exertion ◽

Italian Version ◽

Omni Scale

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Effects of a Ketogenic Diet on Muscle Fatigue in Healthy, Young, Normal-Weight Women: A Randomized Controlled Feeding Trial

Nutrients ◽

10.3390/nu12040955 ◽

2020 ◽

Vol 12 (4) ◽

pp. 955 ◽

Cited By ~ 2

Author(s):

Anna Sjödin ◽

Fredrik Hellström ◽

EwaCarin Sehlstedt ◽

Michael Svensson ◽

Jonas Burén

Keyword(s):

Muscle Fatigue ◽

Mixed Models ◽

Perceived Exertion ◽

Daily Life ◽

Control Diet ◽

Normal Weight ◽

Ratings Of Perceived Exertion ◽

Daily Life Activities ◽

Low Carbohydrate ◽

Handgrip Test

Ketogenic low-carbohydrate high-fat (LCHF) diets are increasingly popular in broad sections of the population. The main objective of this study was to evaluate the effects of a non-energy-restricted ketogenic LCHF diet on muscle fatigue in healthy, young, and normal-weight women. Twenty-four women were randomly allocated to a 4-week ketogenic LCHF diet followed by a 4-week control diet (a National Food Agency recommended diet), or the reverse sequence due to the crossover design. Treatment periods were separated by a 15 week washout period. Seventeen women completed the study and were included in the analyses. Treatment effects were evaluated using mixed models. The ketogenic LCHF diet had no effect on grip strength or time to fatigue, measured with handgrip test (day 24–26). However, cycling time to fatigue decreased with almost two minutes (−1.85 min 95% CI:[−2.30;−1.40]; p < 0.001) during incremental cycling (day 25–27), accommodated with higher ratings of perceived exertion using the Borg scale (p < 0.01). Participants’ own diary notes revealed experiences of muscle fatigue during daily life activities, as well as during exercise. We conclude that in young and healthy women, a ketogenic LCHF diet has an unfavorable effect on muscle fatigue and might affect perceived exertion during daily life activities.

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