Do Endotherms have higher metabolic rate?

Endotherms use metabolic heat to keep a stable body temperature, while ectotherms do not. Among endotherms, smaller animals tend to have higher per-gram basal metabolic rates (a "hotter" metabolism) than larger animals. The same is true among ectotherms, though we can't compare between the groups.
A.

How does Fever increase metabolic rate?

A common pathological cause for a high BMR is fever, since a rise in body temperature increases the rate of cellular metabolic reactions. It is estimated that for every degree Fahrenheit of rise in body temperature, the BMR increases by 7 percent.
  • Do you burn more calories when you have a fever?

    The reasons to eat for fever are more interesting. Fever is part of the immune system's attempt to beat the bugs. It raises body temperature, which increases metabolism and results in more calories burned; for each degree of temperature rise, the energy demand increases further. So taking in calories becomes important.
  • Do you burn more calories when you have your period?

    With the menstrual cycle, the week of your period makes your body do some extra work. This extra work burns more calories and your BMR actually goes up. In some women, the week of your period can make you burn up to fifteen percent more calories, and you haven't changed a single thing about your lifestyle!
  • Do you burn more calories when you are on your period?

    During the luteal phase of the menstrual cycle—the week or so before your period is set to begin—you'll burn up calories faster than at all other times throughout the month. However, most women also experience an increase in appetite during this period. They're hungrier and more prone to cravings.
B.

How does metabolic rate vary with body size?

The relationship between mass and metabolic rate holds true across many species, and even follows a specific mathematical equation. Because of this, a smaller animal would need more energy and a higher metabolic rate to maintain a constant internal temperature (in an environment below its body temperature).
  • What is the average basal metabolic rate?

    The average basal energy expenditure (BEE), also known as basal metabolic rate (BMR), for American women is about 1,400 calories while for a man its roughly 1,800. But don't assume you're average!
  • How does metabolic rate vary with body size?

    The relationship between mass and metabolic rate holds true across many species, and even follows a specific mathematical equation. Because of this, a smaller animal would need more energy and a higher metabolic rate to maintain a constant internal temperature (in an environment below its body temperature).
  • How is basal metabolic rate calculated?

    The Harris Benedict Equation determines your total daily energy expenditure (calories). The BMR formula uses the variables of height, weight, age and gender to calculate the Basal Metabolic Rate (BMR). This tool then uses the Harris Benedict Equation to determine your total daily energy expenditure (calories).

Updated: 22nd September 2018

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