Expectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity.

Journal article


Higgins, Matthew F. and Shabir, Akbar 2016. Expectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity. Applied physiology, nutrition, and metabolism. https://doi.org/10.1139/apnm-2015-0523
AuthorsHiggins, Matthew F. and Shabir, Akbar
Abstract

This study examined whether expectancy of ergogenicity of a commonly used nutritional supplement (sodium bicarbonate; NaHCO3) influenced subsequent high-intensity cycling capacity. Eight recreationally active males (age, 21 ± 1 years; body mass, 75 ± 8 kg; height, 178 ± 4 cm; WPEAK = 205 ± 22 W) performed a graded incremental test to assess peak power output (WPEAK), one familiarisation trial and two experimental trials. Experimental trials consisted of cycling at 100% WPEAK to volitional exhaustion (TLIM) 60 min after ingesting either a placebo (PLA: 0.1 g·kg(-1) sodium chloride (NaCl), 4 mL·kg(-1) tap water, and 1 mL·kg(-1) squash) or a sham placebo (SHAM: 0.1 g·kg(-1) NaCl, 4 mL·kg(-1) carbonated water, and 1 mL·kg(-1) squash). SHAM aimed to replicate the previously reported symptoms of gut fullness (GF) and abdominal discomfort (AD) associated with NaHCO3 ingestion. Treatments were administered double blind and accompanied by written scripts designed to remain neutral (PLA) or induce expectancy of ergogenicity (SHAM). After SHAM mean TLIM increased by 9.5% compared to PLA (461 ± 148 s versus 421 ± 150 s; P = 0.048, d = 0.3). Ratings of GF and AD were mild but ~1 unit higher post-ingestion for SHAM. After 3 min TLIM overall ratings of perceived exertion were 1.4 ± 1.3 units lower for SHAM compared to PLA (P = 0.020, d = 0.6). There were no differences between treatments for blood lactate, blood glucose, or heart rate. In summary, ergogenicity after NaHCO3 ingestion may be influenced by expectancy, which mediates perception of effort during subsequent exercise. The observed ergogenicity with SHAM did not affect our measures of cardiorespiratory physiology or metabolic flux.

KeywordsPsychobiology; Endurance; Fatigue; RPE; Perceived exertion
Year2016
JournalApplied physiology, nutrition, and metabolism
PublisherNRC Research Press
ISSN17155320
Digital Object Identifier (DOI)https://doi.org/10.1139/apnm-2015-0523
Web address (URL)http://hdl.handle.net/10545/621153
http://creativecommons.org/licenses/by/4.0/
hdl:10545/621153
Publication dates10 Feb 2016
Publication process dates
Deposited14 Dec 2016, 19:00
Accepted04 Dec 2015
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Archived with thanks to Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme

ContributorsUniversity of Derby
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