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Related Concept Videos

Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Dose-Response Relationship: Overview01:03

Dose-Response Relationship: Overview

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...
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be met...
Pharmacokinetic–Pharmacodynamic Relationship: Exposure, Response and Effect01:26

Pharmacokinetic–Pharmacodynamic Relationship: Exposure, Response and Effect

The pharmacokinetic-pharmacodynamic (PK-PD) relationship describes the intricate link between drug exposure, efficacy, and toxicity, forming the foundation for optimal dosing regimens. This relationship uses mathematical modeling to characterize drug concentration-effect dynamics, ensuring precise therapeutic outcomes.Exposure represents the pharmacokinetic aspect of the PK-PD relationship, denoting the drug amount that elicits a biological response. It is typically quantified by administered...
Dose Response Curve: Conventional Versus Nonmonotonic01:21

Dose Response Curve: Conventional Versus Nonmonotonic

The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response relationships...
Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

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 β2-adrenergic receptors...

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Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
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Dose-response relationship between exercise and respiratory disease mortality.

Paul T Williams1

  • 1Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA.

Medicine and Science in Sports and Exercise
|September 5, 2013
PubMed
Summary

Regular walking and running significantly reduce mortality from respiratory diseases, including pneumonia and aspiration pneumonia. Increased physical activity, measured in MET-hours per day, shows a dose-dependent protective effect against these conditions.

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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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Published on: October 17, 2018

Area of Science:

  • Exercise Physiology
  • Public Health
  • Respiratory Medicine

Background:

  • Respiratory diseases pose a significant global health burden.
  • Physical activity, such as walking and running, is known to benefit cardiovascular health.
  • The specific impact of exercise dose on respiratory disease mortality requires further elucidation.

Purpose of the Study:

  • To prospectively evaluate the dose-response relationship between physical activity (walking and running) and mortality from respiratory diseases.
  • To specifically examine the association with pneumonia and aspiration pneumonia mortality.
  • To compare the effects of running versus walking on respiratory disease mortality.

Main Methods:

  • A prospective cohort study involving 109,352 runners and 40,798 walkers.
  • Cox proportional hazard analyses were employed to assess mortality risk.
  • Analyses were adjusted for key demographic and lifestyle factors including age, sex, smoking, diet, alcohol consumption, and education, and additionally for body mass index.

Main Results:

  • Higher energy expenditure from walking and running was associated with significantly lower mortality from respiratory diseases.
  • A dose-dependent reduction in mortality was observed: 7.9% for underlying respiratory disease, 13.1% for pneumonia, and 19.9% for aspiration pneumonia per MET-hour per day.
  • No significant difference was found in the mortality reduction effects between running and walking.

Conclusions:

  • Increased engagement in walking and running demonstrates a dose-dependent protective effect against respiratory disease, pneumonia, and aspiration pneumonia mortality.
  • The exercise intensity or mode (running vs. walking) did not alter the observed benefits for respiratory health.
  • These beneficial effects on respiratory mortality appear independent of exercise's known impact on cardiovascular disease.