Key result
Heart rate deflection occurs more often on tracks than treadmills but fails to predict lactate threshold.
Why the study?
Differences in test protocols may explain inconsistent observation of heart rate deflection during incremental running tests and its accuracy in predicting lactate threshold.
Does the heart rate deflection point accurately predict lactate threshold in trained runners across different test protocols?
Comparison
Four running test protocols including treadmill maximal O2 uptake, Conconi track test, continuous treadmill run, and continuous LT treadmill test
Design
Experimental study with repeated measures on same subjects
Authors
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Test protocol differences may explain variable HR deflection; leaves open reliable LT prediction in runners.
Does the heart rate deflection point accurately predict lactate threshold in trained runners across different test protocols?
Absolute Event Rate: 100% vs 50%
The heart rate deflection point is not a reliable predictor of lactate threshold, and its presence is highly dependent on the specific exercise testing protocol used.
Vachon et al. (1999) studied Healthy trained runners (n=8). Track running test protocol vs. Treadmill running test protocol was evaluated on Presence of heart rate deflection. The heart rate deflection point was observed in 100% of runners on the track but only 50% on the treadmill, and it was not an accurate predictor of lactate threshold.
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