Why do a Lactate Profile Test?

Lactate Profile

A Lactate Profile Test is the most accurate method for determining heart rate training zones and measuring training improvement.  The velocity or power at which Lactate Threshold (LT) occurs is the best predictor of endurance performance.  This has been shown in distance running (10 kilometer and marathon races), cross country skiing, cycling (road and mtn. bike) and in triathlons.  In addition, training at or slightly above LT is one of the best ways of improving endurance performance.  Therefore, it is important for a comprehensive training program to include LT intervals, to improve LT. 

Lactate Threshold   

Lactate Threshold (LT) represents a balance point between production and clearance of lactate in the blood.  Lactate is a natural by-product of metabolism and if blood lactate concentration rises too high it causes muscle fatigue and effects energy production.  Lactate is the acute pain you feel in your muscles during intervals or racing.  Lactate threshold is analogous to how high can you race the engine without undue fatigue.  How many revolutions per minute (rpms) does your engine run at LT?  For most runners, LT is well below race pace during a 10 km run.  As race distance increases, race pace approaches LT as measured by speed or heart rate. 

• Do you have the lactate threshold of a Geo Metro (3500 rpm) or a Porsche (7000 rpm)?

Training at lactate threshold greatly increases the body’s ability to clear, metabolize and use lactate as fuel for endurance activities.  If a fire started in a theatre would you like four or 4000 exits?  In this example, the fire is lactate and the theatre is your muscle cell.  Training provides more mitochondria and thus a greatly enhanced ability to metabolize lactate – thus the analogy to a fire exit.