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WHERE THE RUBBER
MEETS THE ROAD
Tyme Wear is born from science, tested in the real world, and made available to all athletes.
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Third party validation

We’ve worked with our research partners to validate the Tyme Wear technology in the lab against the industry’s gold standard metabolic cart.
Breathing Detection
97%
Breathing Rate
97%
Tidal Volume
81%
Minute Ventilation
94%
VT1 Accuracy
97.3%
Test-Retest Reliability
96.1%
VT2 Accuracy
95.8%
Test-Retest Reliability
97.2%

What Is Aerobic Efficiency?

Aerobic efficiency is how well your body converts oxygen to energy.
Improving your aerobic efficiency is a cornerstone of performance in any sport, and it's key to our metabolic health and longevity.

How is my aerobic efficiency measured?

Your body has 3 physiological limits, known as thresholds, that are measured from your breathing and define how efficiently your body burns fuel to produce work.

IMPROVE YOUR THRESHOLDS,
IMPROVE YOUR PERFORMANCE

THRESHOLD IMPROVEMENT OVER TIME
Your race pace is a result of your thresholds, not the other way around. by Targeting your unique thresholds in training, you maximize your performance improvement, while minimizing the amount of work needed to improve.
THRESHOLDS Explained
First threshold (VT1) - Your Base
Fat Max
How it feels: Very Light, Light Intensity
Mitochondrial Growth
Oxygen uptake
Fat utilization
Muscle Capillary Growth
Coach Siggi Explains the First Threshold
Your First Threshold is the foundation of aerobic efficiency. When you improve it through training, you adapt your body to use fat as a fuel source, which indirectly improves your other two Thresholds.
The improvement is felt when you can sustain higher power or pace output at the same light effort level.
Second threshold (VT2) - RACE PACE
Anaerobic
How it feels: Moderate, Hard Intensity
Lactate Utilization
Race-Pace Boost
Muscle Strength
Burns Calories
Coach Siggi Explains the Second Threshold
As we increase the work intensity beyond our first threshold we begin to accumulate lactate and associated by-products in our muscles. The point when this accumulation is no longer sustainable is our Second Threshold.
When we improve our VT2, this switch occurs at a higher intensity. This ability provides short-term race-pace benefits for most endurance distances.
Third Threshold (VO2max) - Ceiling
Max Oxygen Uptake
How it feels: Very Hard, Maximal Intensity
Mitochondrial Growth
Oxygen Uptake
Muscle Strength
Muscle Capillary Growth
Coach Siggi Explains VO2max
The final threshold is your VO2max. You reach this threshold when your muscles cannot utilize more oxygen, and we have thereby reached the limit of our aerobic ability.
Improving VO2max increases our aerobic ceiling and our muscles capacity to use oxygen.

TYME WEAR CASE STUDY

Andrew Greif - Ironman Triathlete
TRAINING PERIOD: 5 MONTHS
BLOCK FOCUS: RUN
TYME TEST FREQUENCY: ~ EVERY 6 WEEKS
INTENSITY DISTRIBUTION: 100% VT1 WORKOUTS
VOLUME: BUILD FROM 26 TO 66 MILES/WEEK
PERIODIZATION: 3 WEEKS BUILD, 1 WEEK RECOVER
Oct 2020
Zone 1 10:32
/mi
VT1
Zone 2 8:20
/mi
VT2
Zone 3 6:15
/mi
VO2max
Dec 2020
Zone 1 9:30
/mi
Zone 2 8:00
/mi
Zone 3 5:33
/mi
Feb 2021
Zone 1 8:00
/mi
Zone 2 6:04
/mi
Zone 3 5:08
/mi
LISTEN TO ANDREW DESCRIBE HIS EXPERIENCE WITH TYME WEAR:
video
“It's paid off tremendously. I’m running faster than I have in the past but feel so much better and stronger.”
ANDREW GREIF
Engineer, MSc.

IS TRAINING WITH THRESHOLD BASED ZONES BETTER THAN OTHER ZONES?

Results From a 12 Week Randomized Control Trial. Link to study.
 
Metabolic Threshold Group
(n= 12)
HRreserve Group
(n=12)
Subjects that improved VO2max:
12 of 12
5 of 12
Average Improvement (12 weeks)
11.7%
4.9%
That’s 2.4x more improvement by using Metabolic Thresholds to guide training!

Using metabolic thresholds to
determine 5-zone model

If you know your three thresholds, you can use them to create the common 5 zones by dividing your first two physiological zones into 2 separate zones. This will effectively give you a low and high intensity in the light, moderate and hard effort levels, respectively.
Study 1
Can Ventilation exclusively determine Ventilatory Thresholds?
Description: 200 graded exercise tests (GXT) conducted on a treadmill and cycle ergometer while using a metabolic cart to measure O2, CO2, Minute Ventilation, SPeed, Power, and Heart Rate, were retrospectively analyzed. Ground Truth VT1 and VT2 were analyzed by trained annotators. Separately, VT1 and VT2 were analyzed from the Minute Ventilation signal from the metabolic cart by trained annotators.
Average difference between heart rate at time of detection for Ground Truth and Ventilation
VT1 HR
VT2 HR
0.8 +/- 7bpm
0.1 +/- 6bpm
READ MORE
Study 1
Can Ventilation exclusively determine Ventilatory Thresholds?
Hypothesis: Ventilatory Thresholds 1 and 2 can be accurately assessed from inflection points in Minute Ventilation data collected from a Metabolic Cart when compared to gold standard VT1 and VT2 assessment by trained clinicians using O2 and CO2.
Methods: 200 graded exercise tests (GXT) conducted on a treadmill and cycle ergometer while using a metabolic cart to measure O2, CO2, Minute Ventilation, SPeed, Power, and Heart Rate, were retrospectively analyzed. Ground Truth VT1 and VT2 were analyzed by trained annotators. Separately, VT1 and VT2 were analyzed from the Minute Ventilation signal from the metabolic cart by trained annotators.
Conclusion: The average difference between the Heart Rate at the time of detection for VT1 and VT2 between the gold standard and Ventilation alone was 0.8 +/- 7bpm and 0.1 +/- 6bpm, respectively. This represents a 0.6% and 0.06% difference between the two methods. Using Ventilation alone is shown to be a valid method for accurately determining VT1 and VT2.
Average difference between heart rate at time of detection for Ground Truth and Ventilation
VT1 HR
VT2 HR
0.8 +/- 7bpm
0.1 +/- 6bpm
Study 2
Can Tyme Wear accurately track Minute Ventilation?
Description: 40 graded exercise tests (GXT) on 20 subjects were conducted on a treadmill while each subject was simultaneously wearing Tyme Wear and hooked up to a Parvo Medics metabolic cart. Cross-correlation was calculated on the Tyme Wear Minute Ventilation signal with the Metabolic Cart Minute Ventilation signal.
Breathing Detection
97%
Breathing Rate
97%
Tidal Volume
81%
Minute Ventilation
94%
READ MORE
Study 2
Can Tyme Wear accurately track Minute Ventilation?
Hypothesis: Tyme Wear’s breathing sensor, which non-invasively measures the expansion and contraction of chest cavity, can be reliably correlated with the Minute Ventilation signal of a Metabolic Cart.
Methods: 40 graded exercise tests (GXT) on 20 subjects were conducted on a treadmill while each subject was simultaneously wearing Tyme Wear and hooked up to a Parvo Medics metabolic cart. Cross-correlation was calculated on the Tyme Wear Minute Ventilation signal with the Metabolic Cart Minute Ventilation signal.
Conclusion: The Tyme Wear’s breath detection was +/- 0.7 breaths/min. Minute Ventilation correlated with that of the Metabolic Cart on average 95%. The signals individual components of Breathing Rate and Tidal volume correlated 97% and 81%, respectively.
Breathing Detection
97%
Breathing Rate
97%
Tidal Volume
81%
Minute Ventilation
94%
Study 3
Can Tyme Wear Minute Ventilation accurately and reliably detect VT1 and VT2?
Description: 16 subjects completed 32 graded exercise tests at The High Altitude Performance Lab at Western Colorado University. Tyme Wear’s threshold detection was independently verified for accuracy and test-retest reliability for detecting VT1 and VT2 compared to expert annotators using a gold standard metabolic cart.
VT1 Accuracy
97.3%
Test-Retest Reliability
96.1%
VT2 Accuracy
95.8%
Test-Retest Reliability
97.2%
READ MORE
Study 3
Can Tyme Wear Minute Ventilation accurately and reliably detect VT1 and VT2?
Hypothesis: VT1 and VT2 can be accurately and reliably detected from Minute Ventilation extracted from Tyme Wear’s breathing sensor when compared to expert annotators using a gold standard metabolic cart.
Methods: 16 subjects completed 32 graded exercise tests at The High Altitude Performance Lab at Western Colorado University. Tyme Wear’s threshold detection was independently verified for accuracy and test-retest reliability for detecting VT1 and VT2 compared to expert annotators using a gold standard metabolic cart.
Conclusion: The average difference between Tyme Wear and the Metabolic Cart, in terms of the Heart Rate at the time of detection, the average difference across both tests was 4 +/- 7bpm and 6.7 +/- 11bpm for VT1 and VT2, respectively. The Coefficient of Variation (CV) in the Test-Retest reliability was 3.9% and 2.8% for VT1 and VT2, respectively. This translates into a margin of error of +/- 2.7% and +/- 3% for VT1 and VT2, respectively, and a very reliable test-retest difference between 3-4%.
VT1 Accuracy
97.3%
Test-Retest Reliability
96.1%
VT2 Accuracy
95.8%
Test-Retest Reliability
97.2%
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Get started today for as low as $35/month
FAQ
How Do I Use Thresholds In My Training?
Your thresholds represent key effort levels that target your unique energy systems. Training at your threshold intensities allows you to improve the overall output as well as the efficiency of the output at each of these levels. This doesn’t mean that you have to race at those paces or power levels but training at them is the most effective way to improve your race pace.
How Is Tyme Wear Different From Other Devices?
Tyme Wear accurately measures your 3 thresholds while other devices rely on formulas that were never intended to be applied to the general public nor dictate the way people train. A study comparing the effectiveness of training with accurate metabolic thresholds against standard heart rate formulas found that only 40% of athletes improved when using heart rate formula, despite training for 12 weeks. In the group using metabolic thresholds, 100% of subjects improved, and their improvement was 2.5x greater on average.
How Does Tyme Wear Measure My Thresholds?
Tyme Wear measures your breathing during a 15 minute ramp protocol and identifies your thresholds as inflection points in your Tyme Wear data. Tyme Wear then provides you with your threshold values in the Pace, Power, and Heart Rate that you’re used to training with along with Breathing Rate, Tidal Volume and Minute Ventilation from the Tyme Wear shirt.
How Accurately Does Tyme Wear Measure Them?
Tyme Wear measures VT1 and VT2 with 97% accuracy. An officially validated accuracy value for the VO2max will be available shortly!
Why Is Heart Rate Inaccurate At Estimating Zones?
Heart rate formulas are built on population averages. Thousands of people were measured in the lab to determine their actual thresholds, and their respective heart rate at each threshold. The average of these thousands of people were then used to create the formulas. The problem is that very few of those thousands of people were actually anywhere close to the average. In fact the spread of the actual threshold heart rates is about 29%, about 15% below and 15% above. This means that a formula like Heart Rate reserve might say your zone 2 is at 130 bpm, when in reality, your actual threshold could be anywhere between 110 and 150bpm. This is why measuring your true thresholds with breathing, either in a lab or with Tyme Wear, is so important for getting accurate workout intensities!