tokens: Correlation coefficients between SF thickness and NIR optical density readings at 940 nm ( OD1 ) and 950 nm ( OD2 ) wavelengths ranged from r = - 0 . 30 ( subscapula ) to r = - 0 . 67 ( biceps ) for OD1 and r = - 0 . 39 ( axilla ) to r = - 0 . 68 ( biceps ) for OD2 .