Activity monitoring device with assessment of exercise intensity

Abstract

Aspects relate to a portable device that may be used to identify a critical intensity and an anaerobic work capacity of an individual. The device may utilize muscle oxygen sensor data, speed data, or power data. The device may utilize data from multiple exercise sessions, or may utilize data from a single exercise session. The device may additionally estimate a critical intensity from a previous race time input from a user.

We claim: 
     
         1 . An apparatus, comprising:
 a processor;   an interface;   an equipment device;   an oxygenation sensor, configured to be positioned proximate an area of skin of a user, the oxygenation sensor further configured to output data indicative of a tissue oxygenation of a body tissue of the user;   a non-transitory computer-readable medium comprising computer-executable instructions that when executed by the processor are configured to perform at least:
 receive tissue oxygenation data from the oxygenation sensor during an exercise session comprising at least a first portion comprising an intermittent activity; 
 calculate a change in tissue oxygenation as a difference between a current tissue oxygenation value and a previous tissue oxygenation value obtained from the same tissue; 
 calculate a rate of change for the change in tissue oxygenation; 
 based on the rate of change, calculate an estimated time to exhaustion for the user; and 
 based upon the estimated time to exhaustion for the user, transmitting an electronic signal to the user recommending equipment to be worn to increase the time to exhaustion of the user. 
   
     
     
         2 . The apparatus of  claim 1 , wherein the equipment comprises footwear worn by the user. 
     
     
         3 . The apparatus of  claim 1 , wherein the equipment comprises apparel worn by the user. 
     
     
         4 . The apparatus of  claim 2 , wherein the equipment is selected from a plurality of footwear types. 
     
     
         5 . The apparatus of  claim 1 , wherein the modification is configured to decrease the energy requirements. 
     
     
         6 . The apparatus of  claim 1 , wherein the tissue oxygenation data comprises data from an inactive muscle. 
     
     
         7 . The apparatus of  claim 1 , wherein the previous tissue oxygenation value is a first oxygenation value and the current tissue oxygenation value is a second oxygenation value, and wherein the computer-readable medium comprises computer-executable instructions that when executed by the processor perform at least:
 calculate a change in tissue oxygenation as a difference between a third tissue oxygenation value and the second tissue oxygenation value obtained from the same tissue;   calculate a second rate of change for the change in tissue oxygenation;   based on the second rate of change, calculate an updated estimated time to exhaustion for the user; and   based upon the updated estimated time to exhaustion for the user, transmitting an electronic signal configured to perform at least one of:
 recommending equipment to be worn to increase the time to exhaustion of the user; and 
 causing an output configured to notify the user to alter behavior to result in a different time to actual exhaustion.