Key result
Cortisol awakening response and orthostatic heart rate showed no significant relationship with acute training loads (p > 0.05) unless distance was accounted for.
Why the study?
It was unknown whether cortisol awakening response varies with acute training load, and evidence supporting orthostatic heart rate testing in athletes was not well established.
Do the cortisol awakening response and orthostatic heart rate correlate with acute training loads in endurance athletes?
Observational (n=15)
Do the cortisol awakening response and orthostatic heart rate correlate with acute training loads in endurance athletes?
p-value: p=> 0.05
Cortisol awakening response and orthostatic heart rate can track training load in endurance athletes only when both internal and external loads (such as distance) are accounted for.
Does not support standalone biomarker use for training load monitoring; leaves open combined internal-external load metrics in endurance cohorts.
The cortisol awakening response (CAR) is used as a marker of stress, however it is unknown whether CAR will vary in response to acute training load. The orthostatic heart rate test (OHR) is commonly used by athletes, but the evidence for its use is not well established. Therefore, the purpose of this study is to investigate the relationship of CAR and OHR with acute training loads (TRIMP). TRIMP, CAR and OHR data were collected in endurance athletes (n = 15) during two weeks of training. No significant relationships were found between any variables and TRIMP (all: p > 0.05). The lack of relationships between CAR and OHR suggest these biomarkers are not useful for tracking TRIMP in endurance athletes. However, when accounting for distance, significant relationships were found between CAR and OHR with TRIMP. CAR and OHR can be used to track training load in endurance athletes, as long as both internal and external loads are accounted for.
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Travis Anderson (2019) conducted an observational in Endurance athletes (n=15). Acute training loads (TRIMP) was evaluated on Relationship of cortisol awakening response (CAR) and orthostatic heart rate (OHR) with acute training loads (TRIMP) (p=> 0.05). Cortisol awakening response and orthostatic heart rate showed no significant relationship with acute training loads (p > 0.05) unless distance was accounted for.
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