toby li, wern ong, joe sun, stephanie wu, christine zhang
TRANSCRIPT
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Continuous Lactate Sensing
Toby Li, Wern Ong, Joe Sun, Stephanie Wu, Christine Zhang
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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
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Performance Criteria
Non-invasive Low cost Easy to use/simplistic Continuous monitoring Real-time feedback
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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
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Goals
Produce a novel method for monitoring lactate anaerobic threshold in exercise situations that is… Hygienic Easy to use Noninvasive Accurate Inexpensive
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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
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Solution Description
Sensor detects lactate levels in saliva
Lactate level transduced into electrical signal
Electrical signal triggers notification mechanism
Athlete modifies training accordingly
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Design 1
•Saliva and blood lactate levels show high correlation
•Embed microfluidic lactate sensor in mouth guard
sensor & processor
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Design Problem
•Wires running from mouth guard would be cumbersome
•Cost of microprocessor for wireless data collection is prohibitive• $150 – 800
5
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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)
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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
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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
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Future
•Decide on design
•Synthesize
•Validate