scholarly journals Maximal power output of a stochastic thermodynamic engine

Automatica ◽  
2021 ◽  
Vol 123 ◽  
pp. 109366
Author(s):  
Rui Fu ◽  
Amirhossein Taghvaei ◽  
Yongxin Chen ◽  
Tryphon T. Georgiou
Keyword(s):  
Power Output ◽  
Maximal Power ◽  
Maximal Power Output

Power output and fatigue of human muscle in maximal cycling exercise

1983 ◽  
Vol 55 (1) ◽  
pp. 218-224 ◽  
Author(s):  
N. McCartney ◽  
G. J. Heigenhauser ◽  
N. L. Jones
Keyword(s):  
Power Output ◽  
Fiber Type ◽  
Average Power ◽  
Lactate Concentration ◽  
Peak Torque ◽  
Muscle Volume ◽  
Thigh Muscle ◽  
Peak Power Output ◽  
Maximal Power ◽  
Maximal Power Output

We studied maximal torque-velocity relationships and fatigue during short-term maximal exercise on a constant velocity cycle ergometer in 13 healthy male subjects. Maximum torque showed an inverse linear relationship to crank velocity between 60 and 160 rpm, and a direct relationship to thigh muscle volume measured by computerized tomography. Peak torque per liter thigh muscle volume (PT, N X ml-1) was related to crank velocity (CV, rpm) in the following equation: PT = 61.7 - 0.234 CV (r = 0.99). Peak power output was a parabolic function of crank velocity in individual subjects, but maximal power output was achieved at varying crank velocities in different subjects. Fiber type distribution was measured in the two subjects showing the greatest differences and demonstrated that a high proportion of type II fibers may be one factor associated with a high crank velocity for maximal power output. The decline in average power during 30 s of maximal effort was least at 60 rpm (23.7 +/- 4.6% of initial maximal power) and greatest at 140 rpm (58.7 +/- 6.5%). At 60 rpm the decline in power over 30 s was inversely related to maximal oxygen uptake (ml X min-1 X kg-1) (r = 0.69). Total work performed and plasma lactate concentration 3 min after completion of 30-s maximum effort were similar for each crank velocity.

scholarly journals Aerobic efficiency is associated with the improvement in maximal power output during acute hyperoxia

2017 ◽  
Vol 5 (2) ◽  
pp. e13119 ◽  
Author(s):  
Tom A. Manselin ◽  
Olof Södergård ◽  
Filip J. Larsen ◽  
Peter Lindholm
Keyword(s):  
Power Output ◽  
Maximal Power ◽  
Maximal Power Output

Effect of inspired O2 concentration on leg lactate release during incremental exercise

1996 ◽  
Vol 81 (1) ◽  
pp. 246-251 ◽  
Author(s):  
D. R. Knight ◽  
D. C. Poole ◽  
M. C. Hogan ◽  
D. E. Bebout ◽  
P. D. Wagner
Keyword(s):  
Blood Lactate ◽  
Power Output ◽  
Incremental Exercise ◽  
Venous Blood Flow ◽  
Maximal Power ◽  
Maximal Power Output ◽  
Lactate Accumulation ◽  
Lactate Release ◽  
O2 Concentration ◽  
Blood Lactate Accumulation

The normal rate of blood lactate accumulation during exercise is increased by hypoxia and decreased by hyperoxia. It is not known whether these changes are primarily determined by the lactate release in locomotory muscles or other tissues. Eleven men performed cycle exercise at 20, 35, 50, 92, and 100% of maximal power output while breathing 12, 21, and 100% O2. Leg lactate release was calculated at each stage of exercise as the product of femoral venous blood flow (thermodilution method) and femoral arteriovenous difference in blood lactate concentrations. Regression analysis showed that leg lactate release accounted for 90% of the variability in mean arterial lactate concentration at 20-92% maximal power output. This relationship was described by a regression line with a slope of 0.28 +/- 0.02 min/l and a y-intercept of 1.06 +/- 0.38 mmol/l (r2 = 0.90). There was no effect of inspired O2 concentration on this relationship (P > 0.05). We conclude that during continuous incremental exercise to fatigue the effect of inspired O2 concentration on blood lactate accumulation is principally determined by the rate of net lactate release in blood vessels of the locomotory muscles.

Four weeks' corticosteroid inhalation does not augment maximal power output in endurance athletes

2008 ◽  
Vol 42 (11) ◽  
pp. 568-571 ◽  
Author(s):  
H Kuipers ◽  
G A C V. Hullenaar ◽  
B M Pluim ◽  
S E Overbeek ◽  
O De Hon ◽  
...  
Keyword(s):  
Power Output ◽  
Endurance Athletes ◽  
Maximal Power ◽  
Maximal Power Output

scholarly journals Is the Optimal Load for Maximal Power Output During Hang Power Cleans Submaximal?

2020 ◽  
Vol 15 (1) ◽  
pp. 18-24
Author(s):  
Seiichiro Takei ◽  
Kuniaki Hirayama ◽  
Junichi Okada
Keyword(s):  
Power Output ◽  
Peak Power ◽  
Reaction Force ◽  
Strong Positive Correlation ◽  
Maximal Power ◽  
Maximal Power Output ◽  
Success Criterion ◽  
Optimal Load ◽  
Weight Lifters ◽  
Bar Velocity

Purpose: The optimal load for maximal power output during hang power cleans (HPCs) from a mechanical perspective is the 1-repetition-maximum (1RM) load; however, previous research has reported otherwise. The present study thus aimed to investigate the underlying factors that determine optimal load during HPCs. Methods: Eight competitive Olympic weight lifters performed HPCs at 40%, 60%, 70%, 80%, 90%, 95%, and 100% of their 1RM while the ground-reaction force and bar/body kinematics were simultaneously recorded. The success criterion during HPC was set above parallel squat at the receiving position. Results: Both peak power and relative peak power were maximized at 80% 1RM (3975.7 [439.1] W, 50.4 [6.6] W/kg, respectively). Peak force, force at peak power, and relative values tended to increase with heavier loads (P < .001), while peak system velocity and system velocity at peak power decreased significantly above 80% 1RM (P = .005 and .011, respectively). There were also significant decreases in peak bar velocity (P < .001) and bar displacement (P < .001) toward heavier loads. There was a strong positive correlation between peak bar velocity and bar displacement in 7 of 8 subjects (r > .90, P < .01). The knee joint angle at the receiving position fell below the quarter-squat position above 70% 1RM. Conclusions: Submaximal loads were indeed optimal for maximal power output for HPC when the success criterion was set above the parallel-squat position. However, when the success criterion was defined as the quarter-squat position, the optimal load became the 1RM load.

scholarly journals Modeling Longitudinal Changes in Maximal-Intensity Exercise Performance in Young Male Rowing Athletes

2012 ◽  
Vol 24 (2) ◽  
pp. 187-198 ◽  
Author(s):  
Pavle Mikulic ◽  
Tomislav Blazina ◽  
Alan M. Nevill ◽  
Goran Markovic
Keyword(s):  
Body Size ◽  
Exercise Performance ◽  
Power Output ◽  
Young Male ◽  
Maximal Power ◽  
Mean Power ◽  
Maximal Power Output ◽  
Explanatory Variables ◽  
Maximal Intensity ◽  
Performance Development

The purpose of the current study was to examine the effect of age and body size upon maximal-intensity exercise performance in young rowing athletes. Male participants n = 171) aged 12–18 years were assessed using an “all-out” 30-s rowing ergometer test, and reassessed after 12 months. The highest rate of performance development, which amounts to [mean(SD)] +34%(23%) and +32%(23%) for mean and maximal power output, respectively, is observed between the ages of 12 and 13, while this rate of development gradually declines as the athletes mature through adolescence. Performance increases with body size, and mass, stature and chronological age all proved to be significant (all p < .05) explanatory variables of mean power output, with respective exponents [mean(SE)] of 0.56(0.08), 1.84(0.30) and 0.07(0.01), and of maximal power output, with respective exponents of 0.54(0.09), 1.76(0.32) and 0.06(0.01). These findings may help coaches better understand the progression of rowing performance during adolescence.

Peak oxygen uptake and maximal power output of Olympic wheelchair-dependent athletes

1991 ◽  
Vol 23 (10) ◽  
pp. 1201???1209 ◽  
Author(s):  
H. E. J. VEEGER ◽  
M. HADJ YAHMED ◽  
L. H. V. VAN DER WOUDE ◽  
P. CHARPENTIER
Keyword(s):  
Oxygen Uptake ◽  
Power Output ◽  
Peak Oxygen Uptake ◽  
Maximal Power ◽  
Maximal Power Output
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