Heart rate tells you what the cardiovascular system is doing. Breathing tells you something the heart rate curve hides, and it changes shape at the ventilatory thresholds instead of drifting with heat and fatigue.
What Coachbox reads
Three channels come across: breathing rate in breaths per minute, minute ventilation in litres per minute, and tidal volume in millilitres. They sit alongside heart rate and power on the workout, so you can look at all of it on one timeline.
Breathing rate can come from two places: a Garmin with a respiration source paired, which includes a Tymewear VitalPro used as a Bluetooth heart rate strap, or the Tymewear Connect IQ data field. Minute ventilation and tidal volume only arrive through the Connect IQ field, so install that one if you want all three channels.
Nothing to set up on our side
There is no Tymewear connection to authorise. The values are already in the file your watch uploads, and Coachbox reads them as it parses the workout. If the channels are in the file, they are on the chart.
What it is good for
Ventilation moves before heart rate does, and it breaks at the thresholds rather than sliding. For an athlete whose heart rate has gone unreliable, through heat, illness or a long block of fatigue, it is a second opinion that does not depend on the same physiology.
