Method and system for measuring lactate levels in vivo

A method for measuring lactate in vivo comprising:

• optically coupling a body part with a light source and a light detector said body part having tissues comprising blood vessels;
• injecting NIR light at one wavelength in said body part;
• detecting, as a function of blood volume variations in said body part, light exiting said body part at a plurality of wavelengths to generate an optical signal due to a Raman shift from lactate;
• processing said optical signal as a function of said blood volume variations to obtain a lactate level in blood.

A method for measuring lactate in vivo comprising:

• optically coupling a body part with a light source and a light detector said body part having tissues comprising blood vessels;
• injecting near-infrared (NIR) light one or more wavelengths in said body part;
• detecting, as a function of blood volume variations in said body part, light exiting said body part at a plurality of wavelengths to generate an optical signal:
• processing said optical signal as a function of said blood volume variations to obtain a lactate level in blood, said processing comprising:
• a) determining a regression calibration coefficient vector for each of said plurality of wavelengths;
• b) obtaining a scalar product from said calibration coefficient vector and an amplitude of each of said plurality of wavelengths.

A system for measuring in vivo lactate levels comprising:

• a NIR light source;
• a source coupler optically coupling said light source to a body part;
• detector coupler optically coupling said body part to a detector for measuring light exiting 'said body part and producing an optical signal;
• processor receiving said optical signal and generating a measured lactate level value;
• and
• a monitoring device comparing said measured lactate level value with at least one predetermined lactate value, and
• triggering a signal perceptible by a user when said compared values are within a predetermined range.