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Related Concept Videos

Maximum Power Transfer01:16

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Instantaneous power is important in electrical circuits, mainly when dealing with sinusoidal input. Instantaneous power, denoted as p(t), results from the multiplication of the instantaneous voltage (v(t)) across an element and the instantaneous current (i(t)) flowing through it. This relationship adheres to the passive sign convention and represents a fundamental principle in electrical engineering.
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Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...
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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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A single-session testing protocol to determine critical power and W'.

Keren Constantini1, Surendran Sabapathy, Troy J Cross

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|February 25, 2014
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Summary
This summary is machine-generated.

A single-visit protocol combining an incremental exercise test and a 3-minute all-out test accurately determines critical power (CP) and work above CP (W'). This efficient method saves time without compromising results for exercise physiology.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Critical Power (CP) and work above CP (W') are key physiological metrics.
  • Traditional methods require two separate laboratory visits for accurate determination.
  • The 3-minute all-out test (3MT) is a standard protocol for CP and W' assessment.

Purpose of the Study:

  • To validate a combined protocol for CP and W' determination.
  • To assess if CP and W' can be accurately measured in a single laboratory visit.
  • To compare a combined incremental test and 3MT protocol against the conventional two-visit approach.

Main Methods:

  • Twelve participants underwent two protocols: a combined test (incremental test + 3MT) and an independent test (3MT on a separate day).
  • A 20-minute recovery period separated the exercise bouts in the combined protocol.
  • CP and W' were calculated using data from both the combined and independent protocols.

Main Results:

  • No significant differences were found in CP (Combined: 254 ± 117 W vs. Independent: 256 ± 118 W, p = 0.40).
  • W' also showed no significant differences between protocols (Combined: 13.7 ± 3.9 kJ vs. Independent: 13.7 ± 4.5 kJ, p = 0.96).
  • High agreement (R² ≥ 0.85) and small errors (CP = 5 W; W' = 1.81 kJ) were observed between the two protocols.

Conclusions:

  • The combined protocol accurately and validly determines CP and W' within a single session.
  • This streamlined approach allows for simultaneous assessment of gas-exchange threshold and peak VO2.
  • The combined protocol enables the definition of exercise-intensity domains (moderate, heavy, severe) efficiently.