maximal oxygen uptake
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Author(s):  
Fang Li ◽  
Chun-Hao Chang ◽  
Chia-An Ho ◽  
Cheng-You Wu ◽  
Hung-Chih Yeh ◽  
...  

The maximal oxygen uptake (VO2max) prediction models established by step tests are often used for evaluating cardiorespiratory fitness (CRF). However, it is unclear which type of stepping frequency sequence is more suitable for the public to assess the CRF. Therefore, the main purpose of this study was to test the effectiveness of two 3-min incremental step-in-place (3MISP) tests (i.e., 3MISP30s and 3MISP60s) with the same total number of steps but different step-frequency sequences in predicting VO2max. In this cross-sectional study, a total of 200 healthy adults in Taiwan completed 3MISP30s and 3MISP60s tests, as well as cardiopulmonary exercise testing. The 3MISP30s and 3MISP60s models were established through multiple stepwise regression analysis by gender, age, percent body fat, and 3MISP-heart rate. The statistical analysis included Pearson’s correlations, the standard errors of estimate, the predicted residual error sum of squares, and the Bland–Altman plot to compare the measured VO2max values and those estimated. The results of the study showed that the exercise intensity of the 3MISP30s test was higher than that of the 3MISP60s test (% heart rate reserve (HRR) during 3MISP30s vs. %HRR during 3MISP60s = 81.00% vs. 76.81%, p < 0.001). Both the 3MISP30s model and the 3MISP60s model explained 64.4% of VO2max, and the standard errors of the estimates were 4.2043 and 4.2090 mL·kg−1·min−1, respectively. The cross-validation results also indicated that the measured VO2max values and those predicted by the 3MISP30s and 3MISP60s models were highly correlated (3MISP30s model: r = 0.804, 3MISP60s model: r = 0.807, both p < 0.001). There was no significant difference between the measured VO2max values and those predicted by the 3MISP30s and 3MISP60s models in the testing group (p > 0.05). The results of the study showed that when the 3MISP60s test was used, the exercise intensity was significantly reduced, but the predictive effectiveness of VO2max did not change. We concluded that the 3MISP60s test was physiologically less stressful than the 3MISP30s test, and it could be a better choice for CRF evaluation.


2021 ◽  
pp. 1-5
Author(s):  
Philipp Kalden ◽  
Isabelle Schoeffl ◽  
Kathrin Rottermann ◽  
Florian Loeffelbein ◽  
Anna Michaelis ◽  
...  

Abstract Introduction: Cardiopulmonary exercise testing represents the diagnostic tool for determining cardiopulmonary function. Especially in small children, exercise testing is extremely challenging. To address this problem, field testing has been implemented using small mobile devices. This study aims at using this protocol for developing normal values for cardiopulmonary exercise testing in very young children. Material and methods: Healthy children aged 4–8 years were recruited. All children were tested according to an outdoor protocol, in which they were instructed to walk, then run slowly, then a little harder and at last run at full speed. Each step lasted for 2 minutes, except the last step, in which the children were instructed to maintain as long as possible. Results: A total of 104 children (64 female/35 male, mean age 6.6 years) performed outdoor cardiopulmonary exercise testing using a mobile device. Almost all tests were completed successfully (95%). Despite a predominance of female study subjects, anthropometric values did not differ between boys and girls. V̇O2peak/kg, respiratory exchange ratio, VT1, heart rate at VT1, and time of exercise were also comparable between sexes. Generally, a tendency of higher maximal oxygen uptake could be observed in older children. Conclusion: Open field mobile cardiopulmonary exercise testing represents a novel approach in very young children. In this study, we were able to determine normal values of maximal oxygen uptake and OUES/kg for 4–8-year-old children. The method is easy to achieve and safe.


Author(s):  
Rita Khairani ◽  
Donna Adriani ◽  
Patwa Amani

BackgroundPulmonary function decreases with age. Similarly, physical exercise capacity measured by maximal oxygen uptake, which is one indicator to measure the level of cardiac and pulmonary vascular resistance, decreases by >1% per year. This results in many respiratory diseases that occur in older persons, especially in obese older persons. Pulmonary function is a basic component of cardiopulmonary endurance, besides other factors such as age, hemodynamics, metabolism, and lifestyle. The objective of this study was to determine whether body mass index (BMI) and pulmonary function have a significant association with cardiopulmonary endurance in older women. MethodsThe study used a cross-sectional design involving 66 subjects aged 60 years and older in South Jakarta. Data was collected by measuring body mass index (BMI), pulmonary function (FEV1, FVC, FEV1/FVC) and maximal oxygen uptake (VO2 max) for cardiopulmonary endurance. Data analysis used simple and multiple linear regression tests in SPSS v.25, with p<0.05. ResultsOf the 66 older persons, 57.6% was obese. Pulmonary function of subjects showed restriction (33.3%), obstruction (6.1%) and a combination of restriction and obstruction (1.5%). Furthermore, mean VO2 max was 12.2 mL/kg/min. Multiple linear regression analysis showed a significant association of BMI and FEV1/FVC with VO2 max (â =-0.56; 95% CI=-0.81 - (-) 0.31; p=0.000; â =0.09; 95% CI=0.01-0.18; p=0.028). BMI was the most influential risk factor of VO2 max (Beta = -0.46). ConclusionsThere was a significant association of BMI and FEV1/FVC with VO2 max, BMI being the most influential risk factor of cardiopulmonary endurance in older women.


Biology ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1196
Author(s):  
Cristian Marín-Pagán ◽  
Stéphane Dufour ◽  
Tomás T. Freitas ◽  
Pedro E. Alcaraz

Endurance profile assessment is of major interest to evaluate the cyclist’s performance potential. In this regard, maximal oxygen uptake and functional threshold power are useful functional parameters to determine metabolic training zones (ventilatory threshold). The aim of this study was to evaluate and compare the physiological profile of different road cyclist age categories (Youth, Junior, and Under-23) to obtain the performance requirements. Sixty-one competitive road cyclists (15–22 years) performed a maximal incremental test on a bike in order to determine functional parameters (maximal fat oxidation zone, ventilatory thresholds, maximal oxygen uptake, and functional threshold power) and metabolic training zones. The results suggest major differences, with the Youth group showing clear changes in all metabolic zones except in fat oxidation. The main differences between Under-23 vs. Junior groups were observed in maximal relative power output (Under-23: 6.70 W·Kg−1; Junior: 6.17 W·Kg−1) and relative functional threshold power (Under-23: 4.91 W·Kg−1; Junior: 4.48 W·Kg−1). The Youth group physiological profile is clearly different to the other age categories. Some parameters normalized to body weight (maximal oxygen consumption, load and functional threshold power) could be interesting to predict a sporting career during the Junior and Under-23 stages.


Author(s):  
Jing Hu ◽  
Zhen Wang ◽  
Bingkai Lei ◽  
Junping Li ◽  
Ruiyuan Wang

The low-carbohydrate high-fat (LCHF) diet has recently been subject to attention on account of its reported influences on body composition and physical performance. However, the combined effect of LCHF with high-intensity interval training (HIIT) is unclear. A systematic review and meta-analysis were conducted to explore the effect of the LCHF diet combined with HIIT on human body composition (i.e., body weight (BM), body mass index (BMI), fat mass (FM), body fat percentage (BFP), fat-free mass (FFM)) and maximal oxygen uptake (VO2max). Online libraries (PubMed, Web of Science, EMBASE, Cochrane Library, EBSCO, CNKI, Wan Fang) were used to search initial studies until July 2021, from which 10 out of 2440 studies were included. WMD served as the effect size with a confidence interval value of 95%. The results of meta-analysis showed a significant reduction in BM (WMD = −5.299; 95% CI: −7.223, −3.376, p = 0.000), BMI (WMD = −1.150; 95% CI: −2.225, −0.075, p = 0.036), BFP (WMD = −2.787; 95% CI: −4.738, −0.835, p = 0.005) and a significant increase in VO2max (WMD = 3.311; 95% CI: 1.705, 4.918, p = 0.000), while FM (WMD = −2.221; 95% CI: −4.582, 0.139, p = 0.065) and FFM (WMD = 0.487; 95% CI: −3.512, 4.469, p = 0.814) remained unchanged. In conclusion, the LCHF diet combined with HIIT can reduce weight and fat effectively. This combination is sufficient to prevent muscle mass loss during LCHF, and further enhance VO2max. Further research might be required to clarify the effect of other types of exercise on body composition and physical performance during LCHF.


Author(s):  
Fang Li ◽  
Chun-Hao Chang ◽  
Yu-Chun Chung ◽  
Huey-June Wu ◽  
Nai-Wen Kan ◽  
...  

The purpose of this research was to develop the 3 min incremental step-in-place (3MISP) test for predicting maximal oxygen uptake (V•O2max). A total of 205 adults (20–64 years) completed the 3MISP and V•O2max tests. Using age, gender, body composition (BC) including percent body fat (PBF) or body mass index (BMI), and with or without heart rate (HR) at the beginning of exercise (HR0) or difference between HR at the third minute during the exercise and the first minute post exercise (ΔHR3 − HR4) in the 3MISP test, six V•O2max prediction models were derived from multiple linear regression. Age (r = −0.239), gender (r = 0.430), BMI (r = −0.191), PBF (r = −0.706), HR0 (r = −0.516), and ΔHR3 − HR4 (r = 0.563) were significantly correlated to V•O2max. Among the six V•O2max prediction models, the PBF model∆HR3 − HR4 has the highest accuracy. The simplest models with age, gender, and PBF/BMI explained 54.5% of the V•O2max in the PBF modelBC and 39.8% of that in the BMI modelBC. The addition of HR0 and ∆HR3 − HR4 increases the variance of V•O2max explained by the PBF and BMI models∆HR3 − HR4 by 17.98% and 45.23%, respectively, while standard errors of estimate decrease by 10.73% and 15.61%. These data demonstrate that the models established using 3MISP-HR data can enhance the accuracy of V•O2max prediction.


2021 ◽  
Author(s):  
Mikkel T Hansen ◽  
Birk M Gronfeldt ◽  
Tue Romer ◽  
Mathilde Fogelstrom ◽  
Kasper Sorensen ◽  
...  

2021 ◽  
Vol 9 (18) ◽  
Author(s):  
Ian R. Villanueva ◽  
John C. Campbell ◽  
Serena M. Medina ◽  
Theresa M. Jorgensen ◽  
Shannon L. Wilson ◽  
...  

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