Perceptual Responses at Running Velocities Proximal to the Onset of Blood Lactate Accumulation

Acevedo, Edmund O.; Haltom, R.; Tryniecki, James L.; Powell, Kendall; Gaydos, P.

doi:10.1097/00005768-199805001-00034

Cited by 18 publications

(24 citation statements)

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“…Both physiological factors (e.g., impaired submaximal exercise capacity (Regensteiner et al 1998;Bauer et al 2007), impaired skeletal muscle microcirculation (Padilla et al 2006;Bauer et al 2007)) and psychological factors (Anderson et al 2001;Golden et al 2008;Polonsky et al 2005;Fisher et al 2007) such as depression and emotional stress associated with T2D might be involved. Psychological factors (such as self-efficacy and psychological endurance) are more strongly inversely correlated with RPE at lower exercise intensity levels than at higher exercise intensity levels in nondiabetics, as shown by prior studies (Hall et al 2005;Acevedo et al 2003;Coquart et al 2008b). An alternate possibility is that the relative work intensity-adjusted RPE group differences at 20 W are due to type II error, but our power calculation and the consistency of the differences between the T2D group and both groups of controls at 20 W suggests that this is unlikely to be the case.…”

Section: Discussionmentioning

confidence: 58%

Women with type 2 diabetes perceive harder effort during exercise than nondiabetic women

Huebschmann

Reis

Emsermann

et al. 2009

Appl. Physiol. Nutr. Metab.

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Regular exercise is a cornerstone of diabetes treatment; however, people with type 2 diabetes (T2D) are commonly sedentary. It is possible that a harder rate of perceived exertion (RPE) during exercise for those with T2D as compared with nondiabetics may be a barrier to physical activity. This study examined RPE (Borg scale, ordinal range 6-20) during submaximal exercise at identical absolute work rates to test the hypothesis that women with T2D demonstrate harder RPE during exercise than nondiabetic controls. In a prespecified analysis of existing data from equivalently sedentary women, RPE during submaximal exercise was compared among women with uncomplicated T2D (n = 13, mean body mass index (BMI) 34.2, mean hemoglobin A1c 9%), overweight controls (OC, n = 13, mean BMI 30.7), and normal-weight controls (NWC, n = 13, mean BMI 23.1). Subjects performed three 7 min, constant-load exercise tests at 20 W and 30 W. Mixed-effects general linear modeling was used to test for differences in mean RPE estimates among groups with and without adjustment for relative work intensity, age, habitual physical activity, or BMI. Subjects with T2D perceived harder effort during bicycling exercise than controls, as measured by RPE at 20 W and 30 W (p < 0.05 for T2D vs. OC and for T2D vs. NWC). Adjusting for relative work intensity eliminated significant group RPE differences at 30 W, but group RPE differences at 20 W remained significant. Harder perceived effort during exercise may be a barrier to physical activity for those with T2D.

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Section: Discussionmentioning

confidence: 58%

Women with type 2 diabetes perceive harder effort during exercise than nondiabetic women

Huebschmann

Reis

Emsermann

et al. 2009

Appl. Physiol. Nutr. Metab.

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show abstract

“…Previous studies have shown that (a) when participants are allowed to select their preferred intensity, they intuitively tend to gravitate toward a level that approximates the point of transition from an intensity that can be maintained through aerobic metabolism to an intensity that requires anaerobic supplementation, operationalized as a threshold in blood lactate accumulation or gas exchange 47,48 and (b) a systematic decrease in self-ratings of pleasure begins once the intensity exceeds the level of the aerobic-anaerobic transition. [49][50][51][52] In analyses not detailed here, we found that normal-weight and overweight participants did not differ in terms of the level of oxygen uptake they utilized in relation to their gas exchange threshold (used as an indirect, noninvasive marker of the aerobic-anaerobic transition) in either the self-selected or the imposed-intensity condition. In the self-selected intensity condition, the intensity remained below the gas exchange threshold for the entire duration of the bout (78, 85, 93, and 97% of the oxygen uptake at the gas exchange threshold at min 5, 10, 15, and 20, respectively).…”

Section: Discussionmentioning

confidence: 65%

Exercise does not feel the same when you are overweight: the impact of self-selected and imposed intensity on affect and exertion

2005

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Objective: The lower rates of adherence to physical activity commonly found among overweight adults compared to their normal-weight counterparts might be due to the activity being experienced as more laborious and less pleasant, particularly when its intensity is prescribed (or imposed) rather than self-selected. Design: Within-subject design, with two 20-min sessions of treadmill exercise, one at self-selected speed and one at imposed speed, 10% higher than the self-selected. Subjects: A total of 16 overweight (BMI: 31 kg/m 2 ) and 9 normal-weight (BMI: 22 kg/m 2 ) previously sedentary but healthy women (age: 43 years). Measurements: Heart rate, oxygen uptake relative to body weight, and ratings of perceived exertion and pleasure-displeasure were assessed every 5 min. Results: The overweight women showed higher oxygen uptake and perceived exertion than the normal-weight women during both sessions. Although the two groups did not differ in ratings of pleasure-displeasure during the session at self-selected speed, only the overweight women showed a significant decline when the speed was imposed. Conclusions: Imposing a speed that is just 10% higher than what overweight women would have self-selected led to a significant decline in reported pleasure. Over time, this could diminish the enjoyment of and intrinsic motivation for physical activity, reducing adherence.

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“…Nevertheless, it is interesting that these studies, despite using very different samples and exercise protocols, produced similar results. Specifically, Acevedo et al [61] examined 11 competitive male distance runners (mean age, 22.6 years; mean VO 2max , 67.7 ml·kg −1 ·min −1 ). They ran for 5 min at intensities 10% below, at, and 10% above OBLA.…”

Section: Discussionmentioning

confidence: 99%

The Relationship Between Exercise Intensity and Affective Responses Demystified: To Crack the 40-Year-Old Nut, Replace the 40-Year-Old Nutcracker!

2008

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Perceptual Responses at Running Velocities Proximal to the Onset of Blood Lactate Accumulation

Cited by 18 publications

References 0 publications

Women with type 2 diabetes perceive harder effort during exercise than nondiabetic women

Women with type 2 diabetes perceive harder effort during exercise than nondiabetic women

Exercise does not feel the same when you are overweight: the impact of self-selected and imposed intensity on affect and exertion

The Relationship Between Exercise Intensity and Affective Responses Demystified: To Crack the 40-Year-Old Nut, Replace the 40-Year-Old Nutcracker!

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