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Fitness Tools

Relative Skeletal Muscle Index

POST
/v1/tools/rsmi

Estimate the appendicular skeletal muscle index (RSMI) from a DXA value (direct) and/or an anthropometric estimate (Wen 2011), and flag low muscle mass against EWGSOP2, AWGS, and Baumgartner sarcopenia cutoffs.

Request Body required

Section titled “Request Body required ”
object
sex
required
string
Allowed values: male female
height
required
object
value
required
number
unit
string
default: cm
Allowed values: cm in mm
weight
required
object
value
required
number
unit
string
default: kg
Allowed values: kg lb
age
required
number
<= 120
asm_kg
number
nullable
methods
Any of:
Array<string>
Example
{
  "sex": "male",
  "height": {
    "value": 180,
    "unit": "cm"
  },
  "weight": {
    "value": 80,
    "unit": "kg"
  },
  "age": 30
}

Responses

Section titled “ Responses ”

200

Section titled “200 ”

Relative Skeletal Muscle Index result

object
results
required
Array<object>
object
method
required
string
value
required
number
unit
required
string
detail
object
key
additional properties
consensus
required
object
mean
required
number
median
required
number
min
required
number
max
required
number
n
required
integer
skipped
required
Array<object>
object
method
required
string
reason
required
string

400

Section titled “400 ”

Inputs valid but semantically impossible, or a required method’s inputs are missing.

object
error
required
object
type
required
string
message
required
string
details

422

Section titled “422 ”

Input failed validation (Zod).

object
error
required
object
type
required
string
message
required
string
details