System and method for determining a subject's muscle fuel level, muscle fuel rating, and muscle energy status

A method, comprising:

• developing a fuel profile for a target muscle by:
• obtaining a series of ultrasound scans of the target muscle at a number of times corresponding at least to a prior to at least one of nutrition or exercise and an after the at least one of nutrition or exercise;
• and
• evaluating the series of ultrasound scans to determine a range of fuel values;
• obtaining a current ultrasound scan of the target muscle;
• establishing a current fuel value for the target muscle;
• and
• ranking the current fuel value within the fuel profile to determine a current fuel level for the target muscle.

A method, comprising:

• developing a fuel profile for a target muscle by:
• obtaining a series of ultrasound scans of a target muscle at a number of times corresponding at least to a prior to at least one of nutrition or exercise and an after the at least one of nutrition or exercise;
• and
• evaluating the series of ultrasound scans to determine a range of fuel values;
• and
• determining a current fuel level for the target muscle using a current ultrasound scan of the target muscle and the fuel profile.