Physiological Determinants of Maximal Aerobic Power in Healthy 12-Year-Old Boys

1999 ◽  
Vol 11 (4) ◽  
pp. 317-326 ◽  
Author(s):  
Thomas Rowland ◽  
Gregory Kline ◽  
Donna Goff ◽  
Leslie Martel ◽  
Lisa Ferrone
Keyword(s):  
Aerobic Power ◽  
Sixth Grade ◽  
Maximal Aerobic Power ◽  
Stroke Index ◽  
Maximal Heart Rate ◽  
Factors Influencing ◽  
Oxygen Difference ◽  
Maximal Cycle ◽  
Standard Gas

Little is known regarding the physiological determinants of maximal oxygen uptake (VO2max) in children. A group of 39 healthy sixth-grade boys (mean age, 12.2 years) underwent maximal cycle testing with determination of cardiovascular factors using Doppler echocardiography as well as standard gas exchange variables. Maximal stroke index was related to VO2max/kg (r=0.52, p < .05), but no relationship was observed between VO2max/kg and either maximal heart rate or calculated maximal arteriovenous oxygen difference. Values of maximal stroke index were closely related to those at rest (r = 0.67). These findings suggest that factors influencing resting stroke volume are primarily responsible for inter-individual differences in VO2max per kg in healthy, non-athletically-trained boys.

Determination of maximal aerobic power during upper-body exercise

1983 ◽  
Vol 54 (1) ◽  
pp. 113-117 ◽  
Author(s):  
M. N. Sawka ◽  
M. E. Foley ◽  
N. A. Pimental ◽  
M. M. Toner ◽  
K. B. Pandolf
Keyword(s):  
Heart Rate ◽  
Aerobic Power ◽  
Pulmonary Ventilation ◽  
Maximal Aerobic Power ◽  
Upper Body ◽  
Maximal Heart Rate ◽  
Upper Body Exercise ◽  
Peak Vo2 ◽  
Power Peak

The purpose of this investigation was to evaluate four protocols for their effectiveness in eliciting maximal aerobic power (peak VO2) during arm-crank exercise. Comparisons were made 1) between a continuous (CON) and an intermittent (INT) protocol (both employed a crank rate of 50 rpm) and 2) among the CON protocols employing crank rates of 30, 50, or 70 rpm. For the first group of experiments no significant (P greater than 0.05) differences were found between the CON and INT protocols for peak VO2, maximal pulmonary ventilation (VEmax), maximal heart rate (HRmax), or maximal blood lactate (LAmax) responses. For the second group of experiments, the CON-50 was compared with the CON-30 and CON-70 protocols. In comparison to the CON-50, significantly higher peak VO2 (+10%) and VEmax (+14%) responses were elicited by the CON-70 protocol, whereas significantly lower peak VO2 (-11%), VEmax (-23%), HRmax (-8%), and LAmax (-29%) responses were elicited by the CON-30 protocol. Of the arm-crank protocols examined the combination of a continuous design and a crank rate of 70 rpm provided the most effective protocol to elicit peak VO2 values.

Determination of the maximal fat oxidation point in obese children and adolescents: validity of methods to assess maximal aerobic power

2008 ◽  
Vol 105 (2) ◽  
pp. 325-331 ◽  
Author(s):  
Julien Aucouturier ◽  
Mélanie Rance ◽  
Martine Meyer ◽  
Laurie Isacco ◽  
David Thivel ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
Aerobic Power ◽  
Fat Oxidation ◽  
Maximal Aerobic Power ◽  
Obese Children ◽  
Maximal Fat Oxidation

Maximal aerobic exercise in pregnant women: heart rate, O2 consumption, CO2 production, and ventilation

1991 ◽  
Vol 70 (3) ◽  
pp. 1016-1023 ◽  
Author(s):  
F. K. Lotgering ◽  
M. B. van Doorn ◽  
P. C. Struijk ◽  
J. Pool ◽  
H. C. Wallenburg
Keyword(s):  
Heart Rate ◽  
Aerobic Power ◽  
Treadmill Exercise ◽  
Statistical Significance ◽  
Maximal Aerobic Power ◽  
Co2 Production ◽  
Maximal Heart Rate ◽  
O2 Uptake ◽  
Positive Linear Correlation ◽  
The Relationship

This study was to determine whether pregnancy affects maximal aerobic power. We measured heart rate, O2 uptake (VO2), CO2 production (VCO2), and ventilation at rest and during bicycle (BE) and treadmill exercise (TE) tests with rapidly increasing exercise intensities at 16, 25, and 35 wk gestation and 7 wk after delivery. Maximal heart rate was slightly lower throughout pregnancy compared with the nonpregnant state during both BE [174 +/- 2 vs. 178 +/- 2 (SE) beats/min] and TE (178 +/- 2 vs. 183 +/- 2 beats/min). Maximal VO2 was unaffected by pregnancy during BE and TE (2.20 +/- 0.08, 2.16 +/- 0.08, 2.15 +/- 0.08, and 2.19 +/- 0.08 l/min for BE and 2.45 +/- 0.08, 2.38 +/- 0.09, 2.33 +/- 0.09, and 2.39 +/- 0.08 l/min for TE at 16, 25, and 35 wk gestation and 7 wk postpartum, respectively). As a result of increased VO2 at rest, the amount of O2 available for exercise (exercise minus rest) tended to decrease with advancing gestation, reaching statistical significance only during TE at 35 wk gestation (1.99 +/- 0.08 l/min vs. 2.10 +/- 0.08 l/min postpartum). Power showed a positive linear correlation with O2 availability during BE as well as TE, and the relationship was unaffected by pregnancy.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Laboratory- and Field-Based Assessment of Maximal Aerobic Power of Elite Stand-Up Paddle-Board Athletes

2016 ◽  
Vol 11 (1) ◽  
pp. 28-32 ◽  
Author(s):  
Ben Schram ◽  
Wayne Hing ◽  
Mike Climstein
Keyword(s):  
Aerobic Power ◽  
Gas Analysis ◽  
Maximal Aerobic Power ◽  
Maximal Heart Rate ◽  
Strong Positive Correlation ◽  
Injury Rehabilitation ◽  
Metabolic Cart ◽  
Water Based ◽  
Analysis System ◽  
Power Outputs

Purpose:Stand-up paddle boarding (SUP) is a rapidly growing sport and recreational activity for which only anecdotal evidence exists on its proposed health, fitness, and injury-rehabilitation benefits. Participants: 10 internationally and nationally ranked elite SUP athletes.Methods:Participants were assessed for their maximal aerobic power on an ergometer in a laboratory and compared with other water-based athletes. Field-based assessments were subsequently performed using a portable gas-analysis system, and a correlation between the 2 measures was performed.Results:Maximal aerobic power (relative) was significantly higher (P = .037) when measured in the field with a portable gas-analysis system (45.48 ± 6.96 mL · kg−1 · min−1) than with laboratory-based metabolic-cart measurements (43.20 ± 6.67 mL · kg−1 · min−1). There was a strong, positive correlation (r = .907) between laboratory and field maximal aerobic power results. Significantly higher (P = .000) measures of SUP paddling speed were found in the field than with the laboratory ergometer (+42.39%). There were no significant differences in maximal heart rate between the laboratory and field settings (P = .576).Conclusion:The results demonstrate the maximal aerobic power representative of internationally and nationally ranked SUP athletes and show that SUP athletes can be assessed for maximal aerobic power in the laboratory with high correlation to field-based measures. The field-based portable gas-analysis unit has a tendency to consistently measure higher oxygen consumption. Elite SUP athletes display aerobic power outputs similar to those of other upper-limb-dominant elite water-based athletes (surfing, dragon-boat racing, and canoeing).

Criterion Validity, Reliability, and Usefulness of a Judo-Specific Maximal Aerobic Power Test

2019 ◽  
Vol 14 (7) ◽  
pp. 987-993
Author(s):  
Seihati A. Shiroma ◽  
Ursula F. Julio ◽  
Emerson Franchini
Keyword(s):  
Perceived Exertion ◽  
Aerobic Power ◽  
Lactate Concentration ◽  
Total Duration ◽  
Criterion Validity ◽  
Maximal Aerobic Power ◽  
Rating Of Perceived Exertion ◽  
Maximal Heart Rate ◽  
Maximal Aerobic Speed ◽  
The Uk

Purpose: To evaluate criterion validity, reliability, and usefulness of a test to measure maximal aerobic power using judo-specific movements (uchi-komi test [UKtest]). Methods: A total of 12 judokas performed 5 graded exercise tests (GETs) in 4 sessions. In sessions 1 and 2, upper-body (UBtest), lower-body (LBtest), and familiarization UKtest were performed. GETs were randomly performed and separated by at least 48 h. In sessions 3 and 4, test and retest UKtest were performed (7 d apart). For all GETs, peak oxygen consumption (), maximal heart rate (HRmax), peak blood lactate concentration [Lapeak], maximal aerobic intensity, and rating of perceived exertion (RPE) were determined. Another group of 12 judokas performed the UKtest and 1 confirmation test (20 min after the UKtest) at 105% of maximal aerobic speed until exhaustion to confirm whether maximal responses were achieved. Results: did not differ (P > .05) between UKtest (46.04 [5.34] mL·kg−1·min−1) and LBtest (44.78 [5.98] mL·kg−1·min−1), but it was higher (P < .05) than UBtest (37.03 [7.16] mL·kg−1·min−1). Total duration (551 [60] s) and [Lapeak] (7.10 [1.76] mmol·L−1) in the UKtest were different (P < .05) from UBtest (416 [47] s, 9.93 [2.15] mmol·L−1, respectively) and LBtest (433 [54] s, 10.29 [2.23] mmol·L−1, respectively). Very large relationships between in UKtest with UBtest (r = .78; P = .003) and LBtest (r = .87; P < .001) were found. Maximal values were achieved for the UKtest , HRmax, [Lapeak], RPE, and maximal aerobic speed, with no difference between test and retest (P > .05). In addition, very large intraclass correlation coefficients (ICC) for (ICC = .86), HRmax (ICC = .90), and maximal aerobic speed (ICC = .81) were found. Conclusion: The UKtest can be considered a valid, reliable, and useful test to measure maximal aerobic power using judo-specific movements.

ARM CRANK PROTOCOLS FOR DETERMINATION OF MAXIMAL AEROBIC POWER

1982 ◽  
Vol 14 (2) ◽  
pp. 168 ◽  
Author(s):  
M. N. Sawka ◽  
M. E. Foley ◽  
N. A. Pimental ◽  
M. M. Toner ◽  
K. B. Pandolf
Keyword(s):  
Aerobic Power ◽  
Maximal Aerobic Power

FACTORS INFLUENCING THE DETERMINATION OF MAXIMUM SURFACE TEMPERATURE FOR EXPLOSION-PROOF LUMINAIRES

2017 ◽  
Vol 16 (6) ◽  
pp. 1309-1316 ◽  
Author(s):  
Lucian Moldovan ◽  
Sorin Burian ◽  
Mihai Magyari ◽  
Marius Darie ◽  
Dragos Fotau
Keyword(s):  
Surface Temperature ◽  
Maximum Surface ◽  
Factors Influencing ◽  
Maximum Surface Temperature

Bestimmung der Dauerhaftigkeit von Hochleistungsbeton mit Hilfe des CDF-Tests / Determination of the durability of high performance concrete by means of CDF-test

1999 ◽  
Vol 5 (1) ◽  
pp. 29-40
Author(s):  
R. Krumbach ◽  
U. Schmelter ◽  
K. Seyfarth
Keyword(s):  
Frost Resistance ◽  
High Strength Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Factors Influencing

Abstract Variable obsen>ations concerning frost resistance of high performance concrete have been made. The question arises which are the decisive factors influencing durability under the action of frost and de-icing salt. The proposed experiments are to be carried out in cooperation with F.A.- Finger - Institute of Bauhaus University Weimar. The aim of this study is to determine possible change of durability of high strength concrete, and to investigate the origin thereof. Measures to reduce the risk of reduced durability have to be found.

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