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dc.contributor.authorHiggins, Matthew F.
dc.contributor.authorShabir, Akbar
dc.date.accessioned2016-12-14T19:00:17Z
dc.date.available2016-12-14T19:00:17Z
dc.date.issued2016-02-10
dc.identifier.citationHiggins, M. F. and Shabir, A. (2016) 'Expectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity', Appl Physiol Nutr Metab, 41 (4):405-10en
dc.identifier.issn17155320
dc.identifier.pmid26863442
dc.identifier.doi10.1139/apnm-2015-0523
dc.identifier.urihttp://hdl.handle.net/10545/621153
dc.description.abstractThis 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.
dc.description.sponsorshipUniversity of Derby Departmental Teaching Budgeten
dc.language.isoenen
dc.publisherNRC Research Pressen
dc.relation.urlhttps://doi.org/10.1139/apnm-2015-0523en
dc.rightsArchived with thanks to Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolismeen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectPsychobiologyen
dc.subjectEnduranceen
dc.subjectFatigueen
dc.subjectRPEen
dc.subjectPerceived exertionen
dc.titleExpectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity.en
dc.title.alternativePhysiologie appliquee, nutrition et metabolismeen
dc.typeArticleen
dc.contributor.departmentUniversity of Derbyen
dc.identifier.journalApplied physiology, nutrition, and metabolismen
dcterms.dateAccepted2015-12-04
refterms.dateFOA2019-02-28T15:11:16Z
html.description.abstractThis 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.


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