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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
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...
Lifestyle Factors and Health01:20

Lifestyle Factors and Health

Lifestyle factors play a critical role in maintaining overall health and preventing chronic diseases. Key elements, such as regular physical activity, a nutritious diet, and abstinence from smoking, can significantly enhance physical, mental, and emotional well-being while reducing the risk of several life-threatening conditions.
Benefits of Physical Activity
Physical activity, whether through structured exercise or casual activities like walking, biking, or dancing, is a cornerstone of a...
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...
Obesity01:24

Obesity

The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in adipocytes...

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Related Experiment Video

Updated: Jun 14, 2026

Multidisciplinary Approach to Obesity Management: A Case Report
05:10

Multidisciplinary Approach to Obesity Management: A Case Report

Published on: May 30, 2025

Physical activity and weight gain prevention.

I-Min Lee1, Luc Djoussé, Howard D Sesso

  • 1Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02215, USA. ilee@rics.bwh.harvard.edu

JAMA
|March 25, 2010
PubMed
Summary

Maintaining a healthy weight requires significant physical activity. Women with a body mass index (BMI) under 25 who engaged in at least 60 minutes of daily moderate activity maintained their weight, while others gained weight.

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Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
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Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

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Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Area of Science:

  • Exercise physiology
  • Public health
  • Obesity research

Background:

  • The precise amount of physical activity required to prevent long-term weight gain remains uncertain.
  • Current federal guidelines suggest 150 minutes per week (7.5 metabolic equivalent [MET] hours) of moderate-intensity activity for health benefits.

Purpose of the Study:

  • To investigate the relationship between varying levels of physical activity and long-term weight changes in women.
  • To analyze weight changes in women consuming a typical diet based on their physical activity levels.

Main Methods:

  • A prospective cohort study followed 34,079 healthy US women from 1992 to 2007.
  • Physical activity (MET hours/week) and body weight were reported at multiple intervals over 13 years.
  • Repeated-measures regression analyzed physical activity and weight change over 3-year intervals.

Main Results:

  • Women gained an average of 2.6 kg during the study period.
  • Higher physical activity levels (≥21 MET hours/week) were associated with less weight gain only in women with a body mass index (BMI) < 25.
  • Women with BMI ≥ 25 showed no significant association between physical activity and weight gain.
  • Weight maintenance (gain < 2.3 kg) over 13 years was achieved by 13.3% of women with initial BMI < 25, averaging 21.5 MET hours/week (approx. 60 min/day).

Conclusions:

  • Physical activity is linked to reduced weight gain in women with a BMI < 25.
  • Achieving normal weight maintenance over 13 years required approximately 60 minutes of daily moderate-intensity activity.
  • No significant association between physical activity and weight gain was observed for women with BMI ≥ 25.