Effect of warm up and sodium bicarbonate ingestion on 4-km cycling time trial performance

Gurton, W.H., Faulkner, S.H. ORCID: 0000-0003-4688-7252 and James, R.M. ORCID: 0000-0002-7119-3159, 2020. Effect of warm up and sodium bicarbonate ingestion on 4-km cycling time trial performance. International Journal of Sports Physiology and Performance. ISSN 1555-0265 (Forthcoming)

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Abstract

Purpose: This study examined whether an ecologically valid, intermittent, sprint-based warm up strategy impacted the ergogenic capacity of individualised sodium bicarbonate (NaHCO3) ingestion on 4-km cycling time trial (TT) performance.

Methods: Eight male cyclists attended six laboratory visits for familiarisation, determination of time to peak blood bicarbonate (HCO3-) and 4x4-km cycling TT’s. Experimental beverages were administered double-blind. Treatments were conducted in a block randomized, crossover order: intermittent warm up + NaHCO3 (IWSB), intermittent warm up + placebo (IWP), control warm up + NaHCO3 (CWSB), control warm up + placebo (CWP). The intermittent warm up comprised exercise corresponding to lactate threshold (5 min at 50%; 2 min at 60%; 2 min at 80%; 1 min at 100%; 2 min at 50%) and 3x10s maximal sprints. The control warm up comprised 16.5 min cycling at 150W. Participants ingested 0.3 g.kg-1 BM NaHCO3 or 0.03 g.kg-1 BM sodium chloride (placebo) in 5 ml.kg-1 BM fluid (3:2, water and sugar-free orange squash). Paired t tests were conducted for TT performance. Haematological data (HCO3-; lactate, BLa-) and gastrointestinal discomfort were analysed using repeated measures ANOVA.

Results: Performance was faster for CWSB vs. IWSB (5.0±6.1s; p=0.052) and CWP (5.8±6.0s; p=0.03). Pre-TT [HCO3-] was elevated for CWSB vs. IWSB (+9.3mmol.l-1; p<0.001) and CWP (+7.1mmol.l-1; p<0.001). Post-TT [BLa-] was elevated for CWSB vs. CWP (+2.52mmol.l-1; p=0.022). Belching was exacerbated pre-warm up for IWSB vs. IWP (p=0.046) and CWP (p=0.027).

Conclusion: An intermittent, sprint-based warm up mitigated the ergogenic benefits of NaHCO3 ingestion on 4-km cycling TT performance.

Item Type: Journal article
Publication Title: International Journal of Sports Physiology and Performance
Creators: Gurton, W.H., Faulkner, S.H. and James, R.M.
Publisher: Human Kinetics
Date: 24 November 2020
ISSN: 1555-0265
Identifiers:
NumberType
1390759Other
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 15 Feb 2021 10:27
Last Modified: 15 Feb 2021 10:27
URI: http://irep.ntu.ac.uk/id/eprint/42296

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