Can metabolic thresholds be used as exercise intensity markers in adult men with obesity – fat burn points used as an exercise marker

2020 ◽  
Vol 16 (2) ◽  
pp. 113-119
Author(s):  
R. Peric ◽  
Z. Nikolovski
Keyword(s):  
Oxygen Consumption ◽  
Exercise Intensity ◽  
Oxidation Rate ◽  
Pearson Correlation ◽  
Maximal Oxygen Consumption ◽  
Fat Oxidation ◽  
Coefficient Of Determination ◽  
Pearson Correlation Coefficient ◽  
Adult Men ◽  
Paired T Test

We aimed to determine the exercise intensity eliciting the highest (FATmax) and the lowest (FATmin) fat oxidation rate in sedentary men with obesity and to examine if these intensities correlate with their individual aerobic (AeT) and anaerobic (AnT) thresholds, respectively. Nineteen obese males performed breath-by-breath analysis to assess maximal oxygen consumption (VO2max) and to calculate their fat oxidation rate. Pearson correlation coefficient (r), coefficient of determination (R2) and paired t-test were used to evaluate VO2 at AeT and at FATmax and VO2 at AnT and at FATmin, respectively. FATmax and AeT occurred at 42.80±2.68% of VO2max and 43.02±2.73% of VO2max, while FATmin and AnT occurred at 53.40±3.65% of VO2max and 53.38±3.65% of VO2max, respectively. A high correlations were found between intensities matching FATmax and AeT (r=0.86, P<0.01) and those at FATmin and at AnT (r=0.99, P<0.01). The existing correlations suggest that metabolic thresholds may be used as exercise intensity markers assuring more tailored exercise approach in men with obesity.

scholarly journals Can Metabolic Thresholds be used as Exercise Intensity Markers in Adult men with Obesity?

2018 ◽  
Author(s):  
Peric Ratko ◽  
Nikolovski Zoran
Keyword(s):  
Oxygen Consumption ◽  
Exercise Intensity ◽  
Oxidation Rate ◽  
Pearson Correlation ◽  
Maximal Oxygen Consumption ◽  
Fat Oxidation ◽  
Coefficient Of Determination ◽  
Pearson Correlation Coefficient ◽  
Adult Men ◽  
Paired T Test

AbstractThe first aim of the study was to identify the exercise intensity eliciting the highest (FATmax) and the lowest (FATmin) fat oxidation rate in men with obesity. The second aim was to evaluate if FATmax and FATmin correlate with aerobic (AeT) and anaerobic (AnT) thresholds, which in turn could be used as exercise intensity markers. Nineteen adult sedentary men participated in the study. Breath-by-breath analysis was performed throughout the test to assess maximal oxygen consumption (VO2max) with stoichiometric equations used to calculate fat oxidation rate. Pearson correlation coefficient (r), coefficient of determination (R2) and paired t-test were used to evaluate differences between VO2 at AeT and at FATmax and VO2 at AnT and at FATmin, respectively. FATmax and AeT occurred at 42.80 ± 2.68 % of VO2max and 43.02 ± 2.73 % of VO2max, while FATmin and AnT occurred at 53.40 ± 3.65 % of VO2max and 53.38 ± 3.65 % of VO2max, respectively. A high correlations were found between VO2 at FATmax and at AeT (r = 0.86, p < 0.01) and VO2 at FATmin and at AnT (r = 0.99, p < 0.01). The existing correlations suggest that metabolic thresholds may be used as exercise intensity markers in men with obesity.

scholarly journals Comparison between continuous and intermittent submaximal exercise at the intensity of maximal fat oxidation

2016 ◽  
Vol 13 (3) ◽  
pp. 4604
Author(s):  
Gökhan İpekoğlu ◽  
Şükrü Serdar Balcı
Keyword(s):  
Oxygen Consumption ◽  
Exercise Intensity ◽  
Oxidation Rate ◽  
Maximal Oxygen Consumption ◽  
Fat Oxidation ◽  
Cycle Ergometer ◽  
Whole Body ◽  
Oxidation Rates ◽  
Maximal Fat Oxidation ◽  
Protocol Test

The aim of the study was to determine the rate of fat oxidation during continuous and intermittent acute endurance exercise. Eleven healthy untrained men participated in this study. Subjects performed Bruce protocol test on cycle ergometer to determine maximal oxygen consumption (VO2max).  The exercise intensity in which the highest fat oxidation rate occurs was determined in this exercise test for each subject. Oxygen uptake (VO2) and carbon dioxide (VCO2) production during the exercises were followed by respiratory gas analyzer and whole-body fat oxidation was calculated by indirect calorimeter equations. Subjects performed 45min intermittent (IE) and continuous (CE) exercises in respiratory exchange ratio (RER) at intensity correspondent at the highest fat oxidation rate (Fat max). The peak fat oxidation rate was equal to 40.6% of maximum oxygen consumption of subjects. The changes occurring with time in fat (F=20.67) and carbohydrate (F=19.44) oxidation rates were statistically significant (P<0.01). However, the changes of fat and carbohydrate (CHO) oxidation with time did not show any statistically significant differences between the continuous and intermittent exercises (P>0.05). The results of the study indicate that the continuous and intermittent exercises performed at the exercise intensity ensuring maximum fat oxidation rate provide similar fat oxidation. Especially, for the individuals starting regular exercise applications newly, it can be said that similar positive results regarding fat oxidation can also be obtained by avoiding the insipidity of long lasting exercises and giving breaks.

Effect of exercise intensity on 24-h energy expenditure and nutrient oxidation

2002 ◽  
Vol 92 (3) ◽  
pp. 1045-1052 ◽  
Author(s):  
Edward L. Melanson ◽  
Teresa A. Sharp ◽  
Helen M. Seagle ◽  
Tracy J. Horton ◽  
William T. Donahoo ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Energy Expenditure ◽  
Exercise Intensity ◽  
Maximal Oxygen Consumption ◽  
Fat Oxidation ◽  
Carbohydrate Oxidation ◽  
Con A ◽  
Oxidation Rates ◽  
Enzymatic Profile ◽  
Low Intensity Exercise

The aim of this study was to determine the effects of exercise at different intensities on 24-h energy expenditure (EE) and substrate oxidation. Sixteen adults (8 men and 8 women) were studied on three occasions [sedentary day (Con), a low-intensity exercise day (LI; 400 kcal at 40% of maximal oxygen consumption) and a high-intensity exercise day (HI; 400 kcal at 70% of maximal oxygen consumption)] by using whole room indirect calorimetry. Both 24-h EE and carbohydrate oxidation were significantly elevated on the exercise days (Con < LI = HI), but 24-h fat oxidation was not different across conditions. Muscle enzymatic profile was not consistently related to 24-h fat or carbohydrate oxidation. With further analysis, it was found that, compared with men, women sustained slightly higher rates of 24-h fat oxidation (mg · kg FFM−1· min−1) and had a muscle enzymatic profile favoring fat oxidation. It is concluded that exercise intensity has no effect on 24-h EE or nutrient oxidation. Additionally, it appears that women may sustain slightly greater 24-h fat oxidation rates during waking and active periods of the day.

scholarly journals Objective and subjective measures of exercise intensity during thermo-neutral and hot yoga

2018 ◽  
Vol 43 (4) ◽  
pp. 397-402 ◽  
Author(s):  
Corinne N. Boyd ◽  
Stephanie M. Lannan ◽  
Micah N. Zuhl ◽  
Ricardo Mora-Rodriguez ◽  
Rachael K. Nelson
Keyword(s):  
Oxygen Consumption ◽  
Light Intensity ◽  
Exercise Intensity ◽  
Perceived Exertion ◽  
Maximal Oxygen Consumption ◽  
Rating Of Perceived Exertion ◽  
Moderate Intensity ◽  
Subjective Measures ◽  
Moderate Intensity Exercise ◽  
Constant Intensity

While hot yoga has gained enormous popularity in recent years, owing in part to increased environmental challenge associated with exercise in the heat, it is not clear whether hot yoga is more vigorous than thermo-neutral yoga. Therefore, the aim of this study was to determine objective and subjective measures of exercise intensity during constant intensity yoga in a hot and thermo-neutral environment. Using a randomized, crossover design, 14 participants completed 2 identical ∼20-min yoga sessions in a hot (35.3 ± 0.8 °C; humidity: 20.5% ± 1.4%) and thermo-neutral (22.1 ± 0.2 °C; humidity: 27.8% ± 1.6%) environment. Oxygen consumption and heart rate (HR) were recorded as objective measures (percentage of maximal oxygen consumption and percentage of maximal HR (%HRmax)) and rating of perceived exertion (RPE) was recorded as a subjective measure of exercise intensity. There was no difference in exercise intensity based on percentage of maximal oxygen consumption during hot versus thermo-neutral yoga (30.9% ± 2.3% vs. 30.5% ± 1.8%, p = 0.68). However, exercise intensity was significantly higher during hot versus thermo-neutral yoga based on %HRmax (67.0% ± 2.3% vs. 60.8% ± 1.9%, p = 0.01) and RPE (12 ± 1 vs. 11 ± 1, p = 0.04). According to established exercise intensities, hot yoga was classified as light-intensity exercise based on percentage of maximal oxygen consumption but moderate-intensity exercise based on %HRmax and RPE while thermo-neutral yoga was classified as light-intensity exercise based on percentage of maximal oxygen uptake, %HRmax, and RPE. Despite the added hemodynamic stress and perception that yoga is more strenuous in a hot environment, we observed similar oxygen consumption during hot versus thermo-neutral yoga, classifying both exercise modalities as light-intensity exercise.

scholarly journals Maximal Fat Oxidation: Comparison between Treadmill, Elliptical and Rowing Exercises

2021 ◽  
pp. 170-178
Author(s):  
Michelle Filipovic ◽  
Stephanie Munten ◽  
Karl-Heinz Herzig ◽  
Dominique D. Gagnon
Keyword(s):  
Oxygen Consumption ◽  
Venous Blood ◽  
Maximal Oxygen Consumption ◽  
Blood Gases ◽  
Fat Oxidation ◽  
Peak Oxygen Consumption ◽  
Whole Body ◽  
Mixed Venous Blood ◽  
Exercise Modality ◽  
Maximal Fat Oxidation

Fat oxidation during exercise is associated with cardio-metabolic benefits, but the extent of which whole-body exercise modality elicits the greatest fat oxidation remains unclear. We investigated the effects of treadmill, elliptical and rowing exercise on fat oxidation in healthy individuals. Nine healthy males participated in three, peak oxygen consumption tests, on a treadmill, elliptical and rowing ergometer. Indirect calorimetry was used to assess maximal oxygen consumption (V̇O2peak), maximal fat oxidation (MFO) rates, and the exercise intensity MFO occurred (Fatmax). Mixed venous blood was collected to assess lactate and blood gases concentrations. While V̇O2peak was similar between exercise modalities, MFO rates were higher on the treadmill (mean ± SD; 0.61 ± 0.06 g·min-1) compared to both the elliptical (0.41 ± 0.08 g·min-1, p = 0.022) and the rower (0.40 ± 0.08 g·min-1, p = 0.017). Fatmax values were also significantly higher on the treadmill (56.0 ± 6.2 %V̇O2peak) compared to both the elliptical (36.8 ± 5.4 %V̇O2peak, p = 0.049) and rower (31.6 ± 5.0 %V̇O2peak, p = 0.021). Post-exercise blood lactate concentrations were also significantly lower following treadmill exercise (p = 0.021). Exercising on a treadmill maximizes fat oxidation to a greater extent than elliptical and rowing exercises, and remains an important exercise modality to improve fat oxidation, and consequently, cardio-metabolic health.

Plasma free and sulfoconjugated catecholamine responses to varying exercise intensity

1987 ◽  
Vol 63 (2) ◽  
pp. 654-658 ◽  
Author(s):  
M. S. Sothmann ◽  
A. B. Gustafson ◽  
M. Chandler
Keyword(s):  
Oxygen Consumption ◽  
Exercise Intensity ◽  
High Intensity ◽  
Maximal Oxygen Consumption ◽  
High Intensity Exercise ◽  
The Relationship ◽  
Circulating Levels

Plasma free catecholamines rise during exercise, but sulfoconjugated catecholamines reportedly fall. This study examined the relationship between exercise intensity and circulating levels of sulfoconjugated norepinephrine, epinephrine, and dopamine. Seven exercise-trained men biked at approximately 30, 60, and 90% of their individual maximal oxygen consumption (VO2max) for 8 min. The 90% VO2max period resulted in significantly increased plasma free norepinephrine (rest, 219 +/- 85; exercise, 2,738 +/- 1,149 pg/ml; P less than or equal to 0.01) and epinephrine (rest, 49 +/- 49; exercise, 555 +/- 516 pg/ml; P less than or equal to 0.05). These changes were accompanied by consistent increases in sulfoconjugated norepinephrine at both the 60% (rest, 852 +/- 292; exercise, 1,431 +/- 639; P less than or equal to 0.05) and 90% (rest, 859 +/- 311; exercise, 2,223 +/- 1,015; P less than or equal to 0.05) VO2max periods. Plasma sulfoconjugated epinephrine and dopamine displayed erratic changes at the three exercise intensities. These findings suggest that sulfoconjugated norepinephrine rises during high-intensity exercise.

Urea kinetics in humans at two levels of exercise intensity

1993 ◽  
Vol 75 (3) ◽  
pp. 1180-1185 ◽  
Author(s):  
F. Carraro ◽  
T. D. Kimbrough ◽  
R. R. Wolfe
Keyword(s):  
Oxygen Consumption ◽  
Exercise Intensity ◽  
Maximal Oxygen Consumption ◽  
Constant Infusion ◽  
Body Protein ◽  
Urea Production ◽  
Urea Kinetics

A primed constant infusion of [15N2]urea was used to quantify the response of urea production to exercise at 40 and 70% maximal oxygen consumption on a treadmill. Total urea production, urea production from recycled N, urea production from nonrecycled N, and urea N recycled back into body protein were calculated. Most components of urea kinetics were unaffected by exercise at either intensity. The rate of urea reincorporated into protein was significantly increased during exercise and recovery at both levels of exercise. We conclude that exercise does not stimulate urea production but that there may be an accelerated reincorporation of urea N back into body protein.

Maximal Oxygen Consumption and Bone Mineral Density in A Group of Adult Men

2014 ◽  
Vol 17 (3) ◽  
pp. 414
Author(s):  
R. El Hage ◽  
E. Zakhem ◽  
G. Zunquin ◽  
D. Theunynck ◽  
F. Bachour ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Oxygen Consumption ◽  
Bone Mineral ◽  
Maximal Oxygen Consumption ◽  
Mineral Density ◽  
Adult Men

scholarly journals Modelamiento matemático de la mortalidad por COVID-19 en China

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Olegario Marín Machuca ◽  
Jessica Blanca Vargas Ayala ◽  
Ulert Marín Sánchez ◽  
Fredy Anibal Alvarado Zambrano ◽  
Elena Elizabeth Lon Kan Prado ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Correction Factor ◽  
Death Rate ◽  
Model Equation ◽  
Pearson Correlation ◽  
Coefficient Of Determination ◽  
Pearson Correlation Coefficient ◽  
Republic Of China ◽  
Palabras Clave ◽  
Independent Variable

<p>Se ha desarrollado un modelo matemático que permita analizar el comportamiento de la mortalidad en la República Popular de China ocasionado por COVID-2019. Se aplicó el modelo logístico para los datos reportados entre 11 de enero y el 12 de abril del 2020. El modelo formulado fue linealizado y planteado en dos formas. La primera, evaluando el factor de corrección B, que hace las veces de cantidad máxima de fallecidos. Se determinaron los parámetros A, k y r, obteniendo el modelo (Ecuación 7), con un coeficiente de correlación r=-0,9660 y el coeficiente de determinación r^2×100=93,31 %. La segunda forma, con el mismo valor de B, introduciendo un factor de corrección para la variable independiente, t, que hace las veces de “periodo”. Se determinaron los parámetros A, k y r, obteniendo el modelo (Ecuación 10), con un coeficiente de correlación r=-0,9668 y el coeficiente de determinación r^2×100=93,48 %; lo que demuestra buena estimación del modelo (Ecuación 7 y Ecuación 10). Asimismo, se evaluó la velocidad de mortalidad, derivando, ordinariamente los modelos (Ecuación 7 y Ecuación 10), obteniendo los modelos de velocidad (Ecuación 8 y Ecuación 11); concluyendo que la máxima velocidad de mortalidad fue de 118 personas por día el día 24 de febrero de 2020.</p><p>Palabras clave: comportamiento, coronavirus, modelo logístico, mortalidad.</p><p> </p><p><strong>ABSTRACT </strong></p><p>A mathematical model has developed in order to analyze the behavior of mortality in the People's Republic of China caused by COVID-2019. The logistical model was applied for the data reported between January 11th and April 12th, 2020. The model formulated was linearized and raised in two forms. The first, pre-evaluating correction factor B, representing the maximum number of deaths. Parameters A, k and r, were assessed obtaining the model (Equation 7), with a Pearson correlation coefficient r=-0,9660 and the coefficient of determination r2x100=93.31%. The second form, with the same value of B, by entering a correction factor for the independent variable t as a "period", Parameters A, k and r, were assessed obtaining the model (Equation 10), with a Pearson correlation coefficient r=-0,9668 and the coefficient of determination r2x100=93.48%; deducting good estimation of the model (Equation 7 and Equation 10). In addition, the death rate was evaluated, ordinating the models (equations 7 and 10), and obtaining the speed models (Equation 8 and Equation 11); describing the maximum death rate was 118 people per day on February 24th 2020.</p><p>Keywords: behavior, coronavirus, logistical model, mortality.</p>

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