Low-protein vegetarian diet does not have a short-term effect on blood acid¿base status but raises oxygen consumption during submaximal cycling
Hietavala, E.-M., Puurtinen, R., Kainulainen, H., & Mero, A. (2012). Low-protein vegetarian diet does not have a short-term effect on blood acid–base status but raises oxygen consumption during submaximal cycling. Journal of the International Society of Sports Nutrition, 9 (50). doi:10.1186/1550-2783-9-50 Retrieved from http://www.jissn.com/content/pdf/1550-2783-9-50.pdf
© 2012 Hietavala et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Background. Acid–base balance refers to the equilibrium between acids and bases in the human body. Nutrition may affect acid–base balance and further physical performance. With the help of PRAL (potential renal acid load), a low-protein vegetarian diet (LPVD) was designed to enhance the production of bases in body. The aim of this study was to investigate if LPVD has an effect on blood acid–base status and performance during submaximal and maximal aerobic cycling. Methods. Nine healthy, recreationally active men (age 23.5 ± 3.4 yr) participated in the study and were randomly divided into two groups in a cross-over study design. Group 1 followed LPVD for 4 days and group 2 ate normally (ND) before performing a cycle ergometer test. The test included three 10-min stages at 40, 60 and 80% of VO2max. The fourth stage was performed at 100% of VO2max until exhaustion. After 10–16 days, the groups started a second 4-day diet, and at the end performed the similar ergometer test. Venous blood samples were collected at the beginning and at the end of both diet periods and after every stage cycled. Results. Diet caused no significant difference in venous blood pH, strong ion difference (SID), total concentration of weak acids (Atot), partial pressure of CO2 (pCO2) or HCO3- at rest or during cycling between LPVD and ND. In the LPVD group, at rest SID significantly increased over the diet period (38.6 ± 1.8 vs. 39.8 ± 0.9, p=0.009). Diet had no significant effect on exercise time to exhaustion, but VO2 was significantly higher at 40, 60 and 80% of VO2max after LPVD compared to ND (2.03 ± 0.25 vs. 1.82 ± 0.21 l/min, p=0.035; 2.86 ± 0.36 vs. 2.52 ± 0.33 l/min, p<0.001 and 4.03 ± 0.50 vs. 3.54 ± 0.58 l/min, p<0.001; respectively). Conclusion. There was no difference in venous blood acid–base status between a 4-day LPVD and ND. VO2 was increased during submaximal cycling after LPVD suggesting that the exercise economy was poorer. This had no further effect on maximal aerobic performance. More studies are needed to define how nutrition affects acid–base balance and performance. ...
PublisherBioMed Central (BMC)
MetadataShow full item record
- Liikuntatieteiden tiedekunta 
Except where otherwise noted, this item's license is described as © 2012 Hietavala et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Showing items with similar title or keywords.
Effects of 12-Week Low or Moderate Dietary Acid Intake on Acid–Base Status and Kidney Function at Rest and during Submaximal Cycling Hietavala, Enni-Maria; Ihalainen, Johanna; Frassetto, Lynda A.; Schumann, Moritz; Eklund, Daniela; Pitkänen, Hannu; Häkkinen, Keijo; Mero, Antti (MDPI AG, 2018)Prolonged effects of dietary acid intake on acid–base status and kidney function have not yet been studied in an intervention study in healthy subjects. Dietary acid load can be estimated by calculating the potential renal ...
Hietavala, Enni-Maria (University of Jyväskylä, 2018)This thesis investigated whether dietary acid load has either short-term (4 to 7 days) or prolonged (12 weeks) effects on acid-base status at rest and during submaximal and maximal aerobic exercise; whether the effects ...
Dietary acid load and renal function have varying effects on blood acid-base status and exercise performance across age and gender Hietavala, Enni-Maria; Stout, Jeffrey R.; Frassetto, Lynda A.; Puurtinen, Risto; Pitkänen, Hannu; Selänne, Harri; Suominen, Harri; Mero, Antti (National Research Council Canada, 2017)Diet composition influences acid-base status of the body. This may become more relevant as renal functional capacity declines with aging. We examined the effects of low (LD) versus high dietary acid load (HD) on blood ...
Bondarev, Dmitriy; Laakkonen, Eija; Finni Juutinen, Taija; Kokko, Katja; Kujala, Urho; Aukee, Pauliina; Kovanen, Vuokko; Sipilä, Sarianna (Lippincott Williams & Wilkins, 2018)Objective: The aim of this study was to examine differences in physical performance (muscle power, muscle strength, aerobic capacity, and walking speed) across menopausal stages and potential of leisure physical activity (PA) ...
Vähäproteiinisen kasvisravinnon vaikutus happo-emästasapainoon, hiilihydraatti- ja rasva-aineenvaihduntaan sekä niiden säätelyyn osallistuviin hormoneihin levossa ja submaksimaalisessa kestävyyssuorituksessa Nurminen, Enni-Maria (2008)Ravinnolla voidaan vaikuttaa elimistön happo-emästasapainoon, jolla edelleen on vaikutus fyysiseensuorituskykyyn. Niukasti proteiinia sisältävä ravinto näyttäisi lisäävän elimistön emästen tuottoa.Emäksisyyden lisääminen ...