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Related Concept Videos

Energy Balance01:19

Energy Balance

The human body gets energy from the three macronutrients: carbohydrates, proteins, and fats. Energy is released when the chemical bonds in the organic compounds present in the food are broken down. The energy content of food is measured in kilocalories (kcal), defined as the amount of heat required to raise the temperature of one kilogram of water by one degree Celsius. This value is determined by measuring the temperature change of the water surrounding a calorimeter after the complete...
Cognitive Dissonance01:38

Cognitive Dissonance

Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
Energy Budgets and Reproductive Strategies00:51

Energy Budgets and Reproductive Strategies

Organisms must balance energy intake with the energy required for growth, maintenance, and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species reproduce only once in their lifetime, often investing most available resources into that single reproductive event. Iteroparous species, by contrast, reproduce multiple times over their lifetimes, typically allocating fewer resources to any single...
Metabolic States of the Body: Fasting and Starvation01:24

Metabolic States of the Body: Fasting and Starvation

During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
Energy Supply for Muscle Contraction01:25

Energy Supply for Muscle Contraction

Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
Trophic Efficiency00:46

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.

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Related Experiment Video

Updated: Jun 9, 2026

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
06:57

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice

Published on: November 11, 2021

Canadian Recruits' Energy Intake During Basic Military Training Did Not Meet Their Energy Requirements.

Raphaëlle Laroche-Nantel1, Heïdi Boilard2, Isabelle Giroux3,4

  • 1Interdisciplinary School of Health Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, ON.

Canadian Journal of Dietetic Practice and Research : a Publication of Dietitians of Canada = Revue Canadienne De La Pratique Et De La Recherche En Dietetique : Une Publication Des Dietetistes Du Canada
|June 8, 2026
PubMed
Summary

Canadian Armed Forces recruits in Basic Military Training (BMT) consumed significantly less energy (65% of needs) than their high energy requirements (ER). This energy deficit during BMT may impact recruit health and performance.

Keywords:
Apport énergétiqueBasic Military TrainingCanadaEnergy intakebesoins énergétiquesenergy requirementsentraînement militaire de baserecruesrecruits

Related Experiment Videos

Last Updated: Jun 9, 2026

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice
06:57

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice

Published on: November 11, 2021

Area of Science:

  • Sports Medicine
  • Military Health
  • Nutritional Science

Background:

  • Basic Military Training (BMT) involves intense physical activity, potentially leading to insufficient energy intake (EI) for recruits.
  • Energy deficits during BMT can negatively affect recruits' health, physical and cognitive function, and increase injury risk.

Purpose of the Study:

  • To compare the average energy intake (EI) to the energy requirements (ER) of Canadian Armed Forces (CAF) recruits during BMT.
  • To identify potential nutritional shortfalls impacting recruit performance and well-being.

Main Methods:

  • Energy intake (EI) was assessed over 4 days using food photography, questionnaires, and analysis software.
  • Energy requirements (ER) were calculated using a validated prediction equation incorporating fat-free mass and physical activity levels.
  • Paired t-tests were used to compare EI and ER.

Main Results:

  • Thirty-three CAF recruits participated in the study.
  • Recruits' average EI was 3160 ± 681 kcal/day, while their mean ER was 4839 ± 735 kcal/day (p < 0.001).
  • Recruits met approximately 65% of their estimated energy requirements during BMT.

Conclusions:

  • CAF recruits exhibit a significant energy deficit during BMT, consuming substantially less energy than required.
  • These findings highlight the need for evidence-based nutritional interventions to optimize energy balance in military recruits.
  • Addressing the energy deficit is crucial for enhancing recruit health, performance, and reducing injury risk during training.