Heart Rate-based Lactate Minimum Test in Running and Cycling.

Area of Science:

• Exercise Physiology
• Sports Science
• Biochemistry

Background:

• The lactate minimum test (LMT) is reproducible but its relationship with maximal lactate steady state (MLSS) is unclear.
• Understanding this relationship is crucial for optimizing endurance training intensity.

Purpose of the Study:

• To investigate the correlation between lactate minimum (LM) and MLSS in both running and cycling.
• To determine if LM can be used to estimate MLSS intensity across different exercise modalities.

Main Methods:

• Twelve endurance-trained men underwent LMT and constant heart rate endurance tests in running and cycling.
• Analysis included heart rate, power output, lactate concentration, oxygen uptake, and perceived exertion.

Main Results:

• All measured parameters were significantly lower at LM compared to MLSS for both running and cycling.
• Significant correlations were found between LM and MLSS data.
• Relative heart rate at LM was similar across exercise modes, unlike relative power output.

Conclusions:

• Lactate minimum parameters are lower but highly correlated with MLSS values in running and cycling.
• The LMT provides a viable method for roughly estimating MLSS exercise intensity using a single test.