When I am giving results to my clients from lactate threshold testing done on the bike, I can not use the same information for running or swimming zones. The heart rate training zones are naturally going to be higher when running. Is there a calculation to take the heart rate and wattage done on a bike and get the heart rate and wattage for running?
I read your question with interest because you are discussing “lactate threshold,” which is arguably determined by various methods and with different definitions. Regardless, it requires drawing blood samples to measure lactate, and it doesn’t seem from your question that you are invasively taking these samples but rather using the term to measure the cross over point between aerobic and non-aerobic (sometimes called non-oxidative) intensity. This can be simplified to make complex physiology understandable and called “threshold.” According to Carl Foster, Ph. D. and world renowned dose-response physiologist, “There’s a hair’s width difference” between at least a half dozen different cross over points and landmarks using physiological responses such as ventilation, talk, RPE, verbal descriptors, lactate and oxygen.
The next question I think you are asking is, “Is lactate threshold testing sport specific?” The answer is yes. You have to measure the threshold point in each individual sport because it is dependent in large part on your sport specific fitness. And your final question is about equations that might be applied if you know one threshold and want to estimate off that for other sports. There is no equation that works for this. Yes, there are ball park estimates, but the error factor is so substantial that I’d recommend not using them. Rather, earn your client’s respect by offering them either a field test or a lab test for threshold.