The decoupling of internal-to-external workload ratio can be used to quantify the ‘durability’ of endurance athletes during long-duration exercise. We used the decoupling of internal (i.e., heart rate) and external (i.e., grade-adjusted speed) workloads, expressed as a ratio indexed to the 5–10 km segment, to quantify the ‘durability’ of > 80,000 marathon runners. Specifically, we assessed the relationship between the magnitude and onset of this decoupling with marathon performance. |
There was a large inter-individual variation in the magnitude and onset of decoupling. However, when classified as low, moderate and high decoupling, athletes experiencing low decoupling had better marathon performance. Moreover, models of marathon performance were improved when both magnitude and onset decoupling are included. |
The data presented herein suggest that the decoupling of internal-to-external workload ratio should be taken into consideration during long-duration exercise, as it can contribute to explain marathon performance. |
1 Introduction
2 Methods
2.1 Dataset
F | M | All | |
---|---|---|---|
Athletes (n) | 13,125 | 69,178 | 82,303 |
Age (y) | 37 ± 8 | 40 ± 26 | 39 ± 24 |
Finish time (min) | 245.2 ± 29.6 | 223.3 ± 32.5 | 226.8 ± 33.1 |
Training sessions (n) | 72 ± 33 | 70 ± 34 | 70 ± 34 |
Weeks (n) | 18.2 ± 2.6 | 18.2 ± 2.5 | 18.2 ± 2.5 |
Training frequency (sessions·wk−1) | 3.9 ± 1.6 | 3.8 ± 1.7 | 3.8 ± 1.7 |
Training volume (km·wk−1) | 40.9 ± 15.74 | 43.0 ± 17.9 | 42.7 ± 17.6 |
2.2 Critical Speed and D′ Determination
2.3 Durability and Decoupling
2.4 Data Analysis
3 Results
3.1 Marathon Performance and Critical Speed
ALL | F | M | M v F | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Sig | d | Sig | D | Sig | d | Sig | d | |||||
Marathon time (min) | ||||||||||||
Low decoupling | 217.3 ± 33.1 | a | 0.23 | 240.5 ± 29.9 | a | 0.22 | 211.1 ± 31.1 | a | 0.31 | * | 0.95 | |
Moderate decoupling | 224.9 ± 31.7 | b | 0.43 | 246.9 ± 28.9 | b | 0.21 | 220.7 ± 30.4 | b | 0.53 | * | 0.87 | |
High decoupling | 238.5 ± 30.7 | c | 0.66 | 252.9 ± 28.0 | c | 0.42 | 236.9 ± 30.6 | c | 0.84 | * | 0.53 | |
All athletes | 226.8 ± 33.1 | 245.2 ± 29.6 | 223.3 ± 32.5 | * | 0.68 | |||||||
Marathon speed (m·s−1) | ||||||||||||
Low decoupling | 3.31 ± 0.50 | a | 0.26 | 2.97 ± 0.38 | a | 0.22 | 3.40 ± 0.49 | 1 | 0.33 | * | 0.92 | |
Moderate decoupling | 3.19 ± 0.45 | b | 0.44 | 2.89 ± 0.36 | b | 0.21 | 3.25 ± 0.45 | 2 | 0.53 | * | 0.83 | |
High decoupling | 3.00 ± 0.41 | c | 0.68 | 2.82 ± 0.34 | c | 0.42 | 3.02 ± 0.41 | 3 | 0.85 | * | 0.51 | |
All athletes | 3.17 ± 0.47 | 2.91 ± 0.37 | 3.22 ± 0.48 | * | 0.67 | |||||||
Critical speed (m·s−1) | ||||||||||||
Low decoupling | 3.78 ± 0.51 | a | 0.14 | 3.39 ± 0.40 | 1 | 0.09 | 3.89 ± 0.48 | 1 | 0.23 | * | 1.10 | |
Moderate decoupling | 3.71 ± 0.47 | b | 0.11 | 3.35 ± 0.39 | 3.78 ± 0.45 | 2 | 0.19 | * | 0.98 | |||
High decoupling | 3.67 ± 0.44 | c | 0.25 | 3.36 ± 0.38 | 3 | 0.08 | 3.70 ± 0.43 | 3 | 0.42 | * | 0.80 | |
All athletes | 3.72 ± 0.48 | 3.37 ± 0.39 | 3.79 ± 0.46 | * | 0.93 | |||||||
Marathon speed (/CS) | ||||||||||||
Low decoupling | 0.88 ± 0.06 | a | 0.25 | 0.88 ± 0.06 | a | 0.24 | 0.88 ± 0.07 | a | 0.25 | * | 0.04 | |
Moderate decoupling | 0.86 ± 0.06 | b | 0.59 | 0.86 ± 0.06 | b | 0.36 | 0.86 ± 0.06 | b | 0.61 | * | 0.07 | |
High decoupling | 0.82 ± 0.07 | c | 0.84 | 0.84 ± 0.06 | c | 0.60 | 0.82 ± 0.07 | c | 0.85 | * | 0.34 | |
All athletes | 0.85 ± 0.07 | 0.87 ± 0.06 | 0.85 ± 0.07 | * | 0.23 | |||||||
Decoupling magnitude (AU) | ||||||||||||
Low decoupling | 1.01 ± 0.18 | a | 1.00 | 1.02 ± 0.12 | 1 | 1.33 | 1.01 ± 0.2 | 1 | 0.95 | |||
Moderate decoupling | 1.15 ± 0.03 | b | 1.07 | 1.14 ± 0.03 | 2 | 1.67 | 1.15 ± 0.03 | 2 | 1.03 | * | 0.11 | |
High decoupling | 1.33 ± 0.24 | c | 1.49 | 1.31 ± 0.16 | 3 | 2.18 | 1.33 ± 0.24 | 3 | 1.42 | * | 0.07 | |
All athletes | 1.16 ± 0.22 | 1.12 ± 0.16 | 1.17 ± 0.22 | * | 0.22 | |||||||
Decoupling onset (km) | ||||||||||||
Low decoupling | 33.4 ± 9.0 | a | 1.32 | 32.9 ± 9.8 | 1 | 1.26 | 33.6 ± 8.7 | a | 1.35 | * | 0.25 | |
Moderate decoupling | 22.6 ± 7.3 | b | 0.49 | 21.7 ± 7.6 | 2 | 0.34 | 22.8 ± 7.2 | b | 0.52 | * | 0.15 | |
High decoupling | 19.1 ± 6.8 | c | 1.79 | 19.1 ± 7.3 | 3 | 1.01 | 19.2 ± 6.7 | c | 1.86 | |||
All athletes | 25.2 ± 9.9 | 26.3 ± 10.6 | 25.0 ± 9.8 | * | 0.13 | |||||||
Decoupling onset (min) | ||||||||||||
Low decoupling | 170.1 ± 53.8 | a | 1.15 | 185.1 ± 61.1 | 1 | 1.16 | 166.1 ± 50.9 | a | 1.14 | * | 0.36 | |
Moderate decoupling | 115.2 ± 40.7 | b | 0.43 | 121.0 ± 45.8 | 2 | 0.35 | 114.1 ± 39.6 | b | 0.43 | * | 0.17 | |
High decoupling | 98.4 ± 37.2 | c | 1.54 | 105.3 ± 42.4 | 3 | 1.43 | 97.6 ± 36.5 | c | 1.56 | * | 0.21 | |
All athletes | 128.6 ± 54.3 | 147.3 ± 63.6 | 125.1 ± 51.6 | * | 0.41 |