What question did this study set out to answer?

This research aims to validate the use of a non-linear index of heart rate variability (HRV) as a marker for the aerobic threshold in elite triathletes.

February 18, 2022SportsOpen Access

An Index of Non-Linear HRV as a Proxy of the Aerobic Threshold Based on Blood Lactate Concentration in Elite Triathletes

Q: What is the clinical evidence from this study?

Study design: Cross-Sectional. Population: Elite triathletes (n=9). Intervention: DFA a1-based HRV threshold (HRVT) vs. First lactate threshold (LT1). Primary outcome: Heart rate at aerobic threshold (Mean difference -1.7 bpm, p=0.52).

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Key result

DFA a1-based HRV threshold closely matches lactate threshold for determining heart rate in elite triathletes.

Mean difference -1.7 bpm
P=0.52
n=9

Why the study?

DFA a1 defines an HRV threshold at the aerobic threshold in recreational runners, but confirmation was needed in elite endurance athletes to monitor training intensity distribution.

Does the DFA a1-based HRVT agree with the first lactate threshold (LT1) in elite triathletes?

Population

9 elite triathletes (7 male, 2 female)

Comparison

HRVT based on DFA a1 vs first lactate threshold (LT1)

Design

Cross-sectional physiological study

Authors

BRBruce RogersUniversity of Central Florida SBSander BerkRoyal Dutch Athletics Federation TGThomas GronwaldGerman Sport University Cologne

Discussion

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Implication

DFA a1 HRVT may estimate LT1 non-invasively in elite triathletes; hypothesis-generating and requires larger prospective validation.

Key Points

This research aims to validate the use of a non-linear index of heart rate variability (HRV) as a marker for the aerobic threshold in elite triathletes.
Nine elite triathletes underwent an incremental cycling ramp test to determine lactate thresholds.
Non-linear HRV was assessed using alpha1 of Detrended Fluctuation Analysis (DFA a1).
Lactate testing was conducted to assess the first lactate threshold (LT1) and compared with heart rate variability thresholds (HRVT).
The mean heart rate at LT1 was 155.8 bpm (±7.0) compared to 153.7 bpm (±10.1) at HRVT (p = 0.52).
Cycling power at LT1 was 252.3 W (±48.1) versus 247.0 W (±53.6) at HRVT (p = 0.17).
Bland–Altman analysis showed mean differences of −1.7 bpm and −5.3 W, with limits of agreement for heart rate and power metrics.

Study Design

Type

Cross-Sectional (n=9)

Structured PICO

Does the DFA a1-based HRVT agree with the first lactate threshold (LT1) in elite triathletes?

Population

9 elite triathletes (7 male, 2 female) attending a training camp

Intervention

Heart rate variability threshold (HRVT) determination using alpha1 of Detrended Fluctuation Analysis (DFA a1)

Comparator

First lactate threshold (LT1) determination based on the log-log calculation method from lactate testing during an incremental cycling ramp test

Outcome

Agreement between HRVT and LT1 for heart rate and cycling powersurrogate

Main Result

Effect estimate: Mean difference -1.7 bpm

Absolute Event Rate: 153.7% vs 155.8%

p-value: p=0.52

The DFA a1-based HRV threshold closely agrees with the first lactate threshold in elite triathletes, offering a non-invasive alternative for identifying aerobic threshold-related training boundaries.

Cite This Study

Rogers et al. (2022) conducted a cross-sectional in Elite triathletes (n=9). DFA a1-based HRV threshold (HRVT) vs. First lactate threshold (LT1) was evaluated on Heart rate at aerobic threshold (Mean difference -1.7 bpm, p=0.52). The DFA a1-based HRV threshold closely agreed with the first lactate threshold for determining heart rate (153.7 vs 155.8 bpm; p=0.52) and cycling power in elite triathletes.

synapsesocial.com/papers/6a0eaeb1a14f152feaf9b387 https://doi.org/10.3390/sports10020025

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An Index of Non-Linear HRV as a Proxy of the Aerobic Threshold Based on Blood Lactate Concentration in Elite Triathletes

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

An Index of Non-Linear HRV as a Proxy of the Aerobic Threshold Based on Blood Lactate Concentration in Elite Triathletes

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

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