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Dose-Response Relationship: Overview01:03

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Agonists can bind with and activate receptors, resulting in the formation of drug-receptor complexes. Once formed, these complexes catalyze many biochemical processes at the cellular level and subsequently induce a pharmacologic response. The degree of response is directly proportional to the fraction of activated receptors, which in turn, depends on the concentration of the drug at the receptor site as well as the sensitivity of the receptor. An increase in the administered dose contributes to...
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Dose Size and Dosing Frequency: Determination Methods01:21

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Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
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Measurement of Bioavailability: Pharmacodynamic Methods01:20

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Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
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Dose-Response Relationship: Potency and Efficacy01:22

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The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it...
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Physiological and compartmental models are valuable tools used in studying biological systems. These models rely on differential equations to maintain mass balance within the system, ensuring an accurate representation of the dynamic processes at play.
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Dose-Response Relationship: Selectivity and Specificity01:25

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Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and...
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Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans
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Acknowledge the Merits and Limitations of Exercise Quantification Methods to Better Control the Dose-Response

François-Denis Desgorces1,2, Arnaud Gouelle1, Philippe Noirez1,2,3,4

  • 1Université de Reims Champagne-Ardenne, PSMS, Reims, France.

International Journal of Sports Physiology and Performance
|November 3, 2025
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Summary

Quantifying exercise is complex. Intensity × duration methods are limited, while maximal volume methods offer a better approach for diverse training, though they require knowing exercise limits.

Keywords:
training loadtraining-program analysis

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Area of Science:

  • Sport science
  • Exercise physiology
  • Training methodology

Background:

  • Exercise quantification is crucial for analyzing training responses but lacks consensus.
  • Accurate methods describe training in standardized units for coaches and scientists.

Purpose of the Study:

  • To compare the advantages and disadvantages of two primary exercise quantification methods.
  • Evaluate methods based on "intensity × duration" versus "maximum tolerable volume."

Main Methods:

  • Analysis of "intensity × duration" quantification, noting limitations with endurance and intermittent exercise.
  • Assessment of "maximum tolerable volume" as a reference for exercise dose.

Main Results:

  • Intensity × duration methods struggle with varying exercise intensity and duration relationships, overvaluing prolonged activities.
  • Maximum volume methods provide a more consistent reference for exercise dose across different exercise types.

Conclusions:

  • "Intensity × duration" methods are best suited for consistent, low-variation training programs.
  • Maximum volume quantification is more versatile but necessitates understanding individual exercise maxima, which can be difficult in practice.