Muscle Fuel Rating - MFR

Muscle Fuel Rating


The ability to compare (rate) the energy status of a muscle with that of a much larger population is a valuable asset to the medical, fitness and wellness field. Prior to MuscleSound, this kind of measure had not been available outside an epidemiological research setting.

Muscle Fuel Rating is used to track and compare a muscle’s MuscleSound score with the scores of tens of thousands of other muscle images in our cloud-based ‘population’ of scans. Muscles are rated using a 5-point scale (very low, low, average, high, very high). This measure can be used in two ways.

  1. To help track behavioral or event driven muscle changes in an individual’s life over time
  2. To assess and track ‘what is possible’ for the Fuel Level of any given muscle.

To obtain a Rating, we find the median echo intensity for the same muscle and side scans in a single assessment. We then calculate the percentile of that echo intensity across entire scan population with similar ultrasound models and muscle locations within the scan. Repeating this process over time enables us to assess any comparative muscle improvements made.

Rationale for Fuel Rating

Fuel Rating enables us to provide more actionable information for a given muscle. For instance, one could have a ‘full tank’ in an individual muscle scan session, but that tank could be small in relation to the total MuscleSound population. If this situation occurred, it would signal that there is room for improvement, over time, for that particular muscle. Only by comparing MuscleSound scores in this way would we have any idea of ‘what is possible’ for a given individual's Fuel Tank. This is important information for any athlete.

Rating can be used

  • to track effects of changes in behavior (vacation, traveling, etc.)
  • to see the broader effects of an ‘event’ (injury, overtraining, etc.)
  • to see the potential of ‘what is possible’ for how a muscle could score
  • to provide information over time to help improve EFL


1.   Gather all images for each muscle and side in the assessment

2.   Calculate the median raw score value of each muscle and side

3.   Use the muscle, location of scoring region of these images, and ultrasound model for referencing

4.   Determine a percentile for the current value in the range of scores for the MuscleSound scan population

The MuscleSound Population Used for Fuel Rating References

Model Muscle Muscle Location Subjects Scans
Lumify RF 4mm-10mm 4046 16084
Lumify GS 2mm-6mm 2355 9384
Lumify FF 0mm-2mm 786 2783
Lumify HL 4mm-10mm 695 2713
Lumify VL 4mm-8mm 725 3493
Lumify Other 4mm-10mm 923 5012
Terason t3200 RF 4mm-10mm 2042 7628
Terason t3200 GS 2mm-8mm 718 3239
Terason t3200 FF 2mm-4mm 165 357
Terason t3200 HL 4mm-12mm 141 531
Terason t3200 VL 4mm-10mm 390 1298
Terason t3200 Other 2mm-6mm 824 4008
GE LogiqE RF 4mm-10mm 190 759
GE LogiqE GS 4mm 17 31
GE LogiqE VL 4mm-6mm 41 131
GE LogiqE Other 0mm-6mm 11 78

For example, a Rectus Femoris muscle was just scanned using a Lumify ultrasound. The muscle is located at a depth of 8mm, and has a resulting Pixel Intensity (brightness) of 40. Using the same population group for that image we find that a 40 is in the 12th percentile.

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