This is the info I collated when I was considering starting sodium bicarbonate:
http://www.mayoclinic.com/health/drug-information/DR601241/DSECTION=proper-use
Dosing
The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
For sodium bicarbonate powder:
To relieve heartburn or sour stomach:
Adults and teenagers—One-half teaspoonful in a glass of water every two hours. Your doctor may change the dose if needed.
Children—Dose must be determined by your doctor.
To make the urine more alkaline (less acidic):
Adults and teenagers—One teaspoonful in a glass of water every four hours. Your doctor may change the dose if needed. However, the dose is usually not more than 4 teaspoonfuls a day.
from
http://www.nlm.nih.gov/medlineplus/druginfo/meds/a682001.html
If you are using sodium bicarbonate as an antacid, it should be taken 1 to 2 hours after meals, with a full glass of water. If you are using sodium bicarbonate for another reason, it may be taken with or without food. Do not take sodium bicarbonate on an overly full stomach.
Do not use sodium bicarbonate for longer than 2 weeks unless your doctor tells you to.
tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially other antacids, aspirin or aspirin-like medicines, benzodiazepines, flecainide (Tambocor), iron, ketoconazole (Nizoral), lithium (Eskalith, Lithobid), methenamine (Hiprex, Urex), methotrexate, quinidine, sulfa-containing antibiotics, tetracycline (Sumycin), or vitamins. Take sodium bicarbonate at least 2 hours apart from other medicines.
tell your doctor if you have or have ever had high blood pressure, congestive heart failure, or kidney disease or if you have recently had bleeding in your stomach or intestine.
Sodium bicarbonate may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
- increased thirst
- stomach cramps
- gas
If you have any of the following symptoms, stop taking sodium bicarbonate and call your doctor immediately:
- severe headache
- nausea
- vomit that resembles coffee grounds
- loss of appetite
- irritability
- weakness
- frequent urge to urinate
- slow breathing
- swelling of feet or lower legs
- bloody, black, or tarry stools
- blood in your urine
From abstract of Effects of Various Sodium Bicarbonate Loading Protocols on the Time-Dependent Extracellular Buffering Profile, Journal of Strength & Conditioning Research:
September 2010 - Volume 24 - Issue 9 - pp 2551-2557
Siegler, Jason C1; Midgley, Adrian W1; Polman, Remco C J2; Lever, Robert1
Although much research has investigated the types of exercise that are enhanced with sodium bicarbonate (NaHCO3) ingestion, to date, there has been limited research on the dosage and timing of ingestion that optimizes the associated ergogenic effects. This study investigated the effects of various NaHCO3 loading protocols on the time-dependent blood-buffering profile. Eight male volunteers (age, 22.4 ± 5.7 yr; height, 179.8 ± 9.6 cm, body mass, 76.3 ± 14.1 kg) completed Part A, measures of alkalosis throughout 120 minutes after ingestion of various single NaHCO3 dosages (0.3 g·kg−1, 0.2 g·kg−1, 0.1 g·kg−1, and placebo); and Part B, similar profiles after alternative NaHCO3 loading protocols (single morning dosage [SMD], single evening dosage [SED], and dosages ingested on 3 consecutive evenings [CED]). Results from Part A are as follows. Blood buffering in the 0.1 g·kg−1 condition was significantly lower than the 0.2 g·kg−1 and 0.3 g·kg−1 conditions (p < 0.002), but there was no significant differences between the 0.2 g·kg−1 and 0.3 g·kg−1 conditions (p = 0.34). Although the blood buffering was relatively constant in the 0.1 and 0.2 conditions, it was significantly higher at 60 minutes than at 100 minutes and 120 minutes in the 0.3 g·kg−1 condition (p < 0.05). Results from Part B are as follows. Blood buffering for SMD was significantly higher than for SED and CED (p < 0.05). Blood buffering in the SMD condition was significantly lower at 17:00 hours than at 11:00 hours (p = 0.007). The single 0.2 and 0.3 g·kg−1 NaHCO3 dosages appeared to be the most effective for increasing blood-buffering capacity. The 0.2 g·kg−1 dosage is best ingested 40 to 50 minutes before exercise and the 0.3 g·kg−1 dosage 60 minutes before exercise.
The abstract is at
http://www.ncbi.nlm.nih.gov/pubmed/20040895
More info at
http://preprod.easacademy.org/curre...-on-the-time-dependent-extracellular-bufferin:
This article did not address actual performance effects of these increases in pH and it would have been interesting to see how blood pH would have been affected during exercise as opposed to rest. However, there are several studies demonstrating efficacy of bicarbonate loading for performance under certain exercise conditions. The single 0.2-g/kg and 0.3-g/kg NaHCO3 dosages appeared to be the most effective for increasing blood-buffering capacity. There was no significant difference between the 0.2-g/kg and 0.3-g/kg NaHCO3 dosages. The 0.2-g/kg dosage is best ingested 40 to 50 min before exercise and the 0.3-g/kg dosage 60 min before exercise. Because NaHCO3 loading may cause dehydration, it is important to monitor hydration by plasma/urine osmolality or the specific gravity of urine. Single doses exceeding 0.3 g/kg are not recommended because the risk of side effects increases.
Also see paper
Effects of sodium bicarbonate ingestion on swim performance in youth athletes
Adam Zajac, Jaroslaw Cholewa, Stanislaw Poprzecki, Zbigniew Waśkiewicz and Jozef Langfort
Journal of Sports Science and Medicine (2009) 8, 45-50
at
http://www.jssm.org/vol8/n1/7/v8n1-7pdf.pdf
I ignore some of it, such as doing what doctors tell me!
Re stomach acid, the amount you need may depend on your diet. Some of us may be prone to gut acidosis.