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Continuous Lactate Sensing

Toby Li, Wern Ong , Joe Sun, Stephanie Wu, Christine Zhang. Continuous Lactate Sensing. Problem Statement. Athletes need a means to non-invasively continuously monitor lactate anaerobic threshold for use in training

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Continuous Lactate Sensing

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  1. Toby Li, WernOng, Joe Sun, Stephanie Wu, Christine Zhang Continuous Lactate Sensing

  2. Problem Statement • Athletes need a means to non-invasively continuously monitor lactate anaerobic threshold for use in training • Current systems are expensive and cumbersome and require a laboratory environment

  3. Performance Criteria • Non-invasive • Low cost • Easy to use/simplistic • Continuous monitoring • Real-time feedback

  4. Primary Objective • Continuous monitoring • Performance Evaluation • Training Exercises • Potential Users • Athletes & Professional Sports • 400,000 college athletes • Sport Enthusiasts • 467,000 marathon runners in U.S. 2009

  5. Goals • Produce a novel method for monitoring lactate anaerobic threshold in exercise situations that is… • Hygienic • Easy to use • Noninvasive • Accurate • Inexpensive

  6. Performance Metrics • Lactate anaerobic threshold sensing • 1 mmol resolution • 80% users surveyed agree that device is • Comfortable • Less than 2 minute lag time • Less than $30 per unit • Reusable up to 10 times

  7. Solution Description • Sensor detects lactate levels in saliva • Lactate level transduced into electrical signal • Electrical signal triggers notification mechanism • Athlete modifies training accordingly

  8. Design 1 • Saliva and blood lactate levels show high correlation • Embed microfluidic lactate sensor in mouth guard sensor & processor

  9. Design Problem • Wires running from mouth guard would be cumbersome • Cost of microprocessor for wireless data collection is prohibitive • $150 – 800 5

  10. Design 2 • Common mouth guard dimensions (7.5 cm × 7.5 cm × 2.5 cm ) • Example saliva lactate sensor design (5.5mm×6.4mm×0.7mm)

  11. Mouth Guard Architecture • Part of the mouth guard removed from where the chip and gel will be installed • Chamber for electro-sensitive gel and films connected to working electrode (red) and reference electrode (green) • Thin film of mouth guard material seals the chip and gel

  12. Design Problems • Modifying existing saliva lactate chip to better suit this application • Connecting Working Electrode and reference electrode to the gel chamber • Selection of electro-sensitive gel • Inherent variance of human lactate baseline and threshold

  13. Future • Decide on design • Synthesize • Validate

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