Pressure sensitive strap for wearable electronics

A wearable fitness system, comprising:

• one or more optical sources;
• one or more optical detectors;
• a wearable housing;
• a strap affixed to the wearable housing, the strap configured to attach the wearable housing to a user;
• one or more tension sensors;
• and
• a processor in the wearable housing, the processor configured by computer executable code stored in a non-transitory computer readable medium to:
• use information from the one or more tension sensors to determine if a pressure by the strap against a tissue of the user constricts blood flow in a manner that affects pulse oxygen based on signals from the one or more optical detectors,
• process the signals from the one or more optical detectors for optical detection of a fitness parameter of the user, wherein the fitness parameter includes a pulse oxygen of the user, and
• evaluate the signals from the one or more optical detectors based on the information from the one or more tension sensors,
• when the tension by the strap affects pulse oxygen measurements based on measurements from the one or more optical sources, provide information to the user including a graphical representation of data related to a tension distribution on the strap to facilitate an adjustment by the user such that tension levels by the strap are consistent throughout a plurality of measurements, and
• when the tension by the strap does not affect pulse oxygen measurements based on measurements from the one or more optical sources, process the signals from the one or more optical detectors for optical detection of a fitness parameter of the user, wherein the fitness parameter includes a pulse oxygen of the user.