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Related Concept Videos

Line Loss01:10

Line Loss

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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
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Weighted Mean00:57

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While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
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Reducing Line Loss01:18

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Atomic Weight01:25

Atomic Weight

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Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams. Scientists arbitrarily define this amount of mass as one atomic mass unit (amu) or one Dalton. Electrons are much smaller in mass than protons, weighing only 9.11 × 10-28 grams, or about 1/1800 of an atomic mass unit. As a result, they do not contribute much to an element's overall atomic mass. This means that, when considering atomic mass, it is customary to ignore the mass of any electrons and...
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Mass and Weight01:19

Mass and Weight

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Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the...
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Maintenance of the ES Cell State01:14

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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Related Experiment Video

Updated: Feb 15, 2026

Regular Care and Maintenance of a Zebrafish Danio rerio Laboratory: An Introduction
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Is regular exercise an effective strategy for weight loss maintenance?

R M Foright1, D M Presby1, V D Sherk1

  • 1Department of Medicine, Division of Endocrinology, Metabolism and Diabetes, University of Colorado Anschutz Medical Campus, Aurora, CO, United States.

Physiology & Behavior
|February 1, 2018
PubMed
Summary
This summary is machine-generated.

Maintaining weight loss is challenging. This review examines evidence for exercise in obesity treatment, highlighting key questions for future research on its effectiveness in weight management.

Keywords:
Individual variabilityObesityPhysical activityWeight regain

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Area of Science:

  • Obesity research
  • Exercise physiology
  • Weight management

Background:

  • Weight regain is a major obstacle in obesity treatment.
  • The effectiveness of regular exercise for weight loss maintenance lacks definitive clinical trial evidence.
  • Conflicting views exist regarding exercise's role as an obesity therapeutic.

Purpose of the Study:

  • To review and clarify the existing literature on exercise for obesity treatment.
  • To present a unified perspective on exercise's benefits and limitations in weight management.
  • To identify critical knowledge gaps for future research.

Main Methods:

  • Literature review of arguments for and against exercise in obesity therapy.
  • Critical analysis of clinical trial evidence.
  • Identification of unresolved questions and areas for future investigation.

Main Results:

  • The effectiveness of exercise for weight loss maintenance remains debated due to inconsistent evidence.
  • Significant questions persist regarding sex differences, individual variability, and compensatory behaviors.
  • Adherence, energy flux, and molecular mechanisms require further study.

Conclusions:

  • Further research is essential to fully understand exercise's role in preventing weight regain.
  • Addressing sex differences, adherence, and underlying mechanisms will enhance obesity treatment strategies.
  • A comprehensive understanding is needed to optimize exercise interventions for long-term weight loss maintenance.