What Causes Male and Female BMR Differences?

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Discussion Overview

The discussion centers around the physiological factors contributing to differences in basal metabolic rates (BMR) between males and females. Participants explore various biological and hormonal influences, as well as the implications of body composition differences.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that the fat-to-muscle ratio is a significant factor in BMR differences between genders.
  • Another participant asserts that a higher fat percentage is a result of BMR rather than a cause.
  • A later reply introduces the idea that the relationship between fat percentage and BMR could be both causal and consequential, questioning which factor precedes the other.
  • One participant proposes that estrogen contributes to the higher fat percentage in females, while testosterone influences the greater muscle percentage in males.
  • Another participant elaborates that estrogen affects fat distribution in females, and that testosterone, along with other hormones, plays a role in muscle development, noting that receptor sites are crucial for testosterone's effectiveness.

Areas of Agreement / Disagreement

Participants express differing views on the causal relationships between fat percentage, muscle percentage, and BMR. There is no consensus on whether fat percentage is a cause or a result of BMR differences, and the discussion remains unresolved regarding the interplay of hormones and body composition.

Contextual Notes

Participants have not fully explored the implications of hormonal receptor sites on muscle development, and the discussion lacks clarity on how these factors interact over time.

muadib2k
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Hi,

What are some of the physiological factors that cause males and females to have different BMR’s (base metabolic rates)?

I’m thinking that one factor would be the difference in the fat:muscle ratio in males and females. Also, on average at least, males tend to be taller. Are there any other major reasons that may account for the BMR differences?

Thanks,
 
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Higher fat percentage is the result of BMR, not the cause.

Nautica
 
After thinking about it, It would be both the cause and the result. Which came first?

Nautica
 
I think, and someone correct me if I'm wrong, that the higher fat percentage is the result of estrogen in females. Likewise the higher percentage of muscle in males is due to testosterone.
 
The estrogen is responsible for the female disperment of fat.

The testosterone, along with HGH, IGF-1 and receptor sites for each are responsible for muscle. With out the proper receptor sites the testosterone will not have the effect on the muscles.

For example, you can give a female and extremely high dosage of test and she will not build the muscle like a male will.

Nautica
 

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