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Determinants of last lap speed in paced and maximal 1500-m time trials

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Abstract

Purpose

The present study identified the physiological and performance characteristics that are deterministic during a maximal 1500-m time trial and in paced 1500-m time trials, with an all-out last lap.

Methods

Thirty-two trained middle-distance runners (n = 21 male, VO2peak: 72.1 ± 3.2; n = 11, female, VO2peak: 61.2 ± 3.7 mL kg−1 min−1) completed a 1500-m time trial in the fastest time possible (1500FAST) as well as a 1500MOD and 1500SLOW trial whereby mean speed was reduced during the 0–1100 m by 5% and 10%, respectively. Anaerobic speed reserve (ASR), running economy (RE), the velocity corresponding with VO2peak (VVO2peak), maximal sprint speed (MSS) and maximal accumulated oxygen deficit (MAOD) were determined during additional testing. Carnosine content was quantified by proton magnetic resonance spectroscopy in the gastrocnemius and expressed as a Z-score to estimate muscle fibre typology.

Results

1500FAST time was best explained by RE and VVO2peak in female runners (adjusted r2 = 0.80, P < 0.001), in addition to the 0–1100-m speed relative to VVO2peak in male runners (adjusted r2 = 0.72, P < 0.001). Runners with a higher gastrocnemius carnosine Z-score (i.e., higher estimated percentage of type II fibres) and greater MAOD, reduced their last lap time to a greater extent in the paced 1500-m trials. Neither ASR nor MSS was associated with last lap time in the paced trials.

Conclusion

These findings suggest that VVO2 peak and RE are key determinants of 1500-m running performance with a sustained pace from the start, while a higher carnosine Z-score and MAOD are more important for last lap speed in tactical 1500-m races.

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Abbreviations

RE:

Running economy

VVO2peak :

Minimal velocity that elicits VO2peak

ASR:

Anaerobic speed reserve

MSS:

Maximal sprinting speed

CS:

Critical speed

D’:

Curvature constant

VO2peak :

Peak oxygen uptake

1500FAST :

Maximal 1500-m time trial

1500MOD :

Moderately paced 1500-m time trial

1500SLOW :

Slow-paced 1500-m time trial

MAOD:

Maximal accumulated oxygen deficit

d :

Distance run

t:

Time

CV:

Coefficient of variation

VO2 :

Oxygen uptake

GET:

Gas exchange threshold

TTE:

Time to exhaustion

1H-MRS:

Proton magnetic resonance spectroscopy

MRI:

Magnetic resonance imaging

SD:

Standard deviation

References

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Author information

Authors and Affiliations

Authors

Contributions

PB, WD, EL, BA and CM conceived and designed research. PB, BK, HR and BA conducted experiments. WD and EL analysed 1H-MRS data. PB analysed training and performance data. PB wrote the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Phillip Bellinger.

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Conflict of interest

The authors declare that we received internal funding from Griffith University which supported MR related costs for the data collection. The authors have no competing financial or non-financial interests to disclose. The results of the present study are presented clearly, honestly, and without fabrication.

Additional information

Communicated by Philip D. Chilibeck.

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Bellinger, P., Derave, W., Lievens, E. et al. Determinants of last lap speed in paced and maximal 1500-m time trials. Eur J Appl Physiol 121, 525–537 (2021). https://doi.org/10.1007/s00421-020-04543-x

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  • DOI: https://doi.org/10.1007/s00421-020-04543-x

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