PMID- 9927017
OWN - NLM
STAT- MEDLINE
DCOM- 19990323
LR  - 20190831
IS  - 0195-9131 (Print)
IS  - 0195-9131 (Linking)
VI  - 31
IP  - 1
DP  - 1999 Jan
TI  - Does exercise intensity or diet influence lactic acid accumulation in breast 
      milk?
PG  - 105-10
AB  - PURPOSE: This study examined the relationships among diet, exercise intensity, 
      and breast milk composition in lactating women. METHODS: Twelve lactating women 
      were randomly assigned to either a high (N = 6; 5.03 g carbohydrate (CHO) x kg 
      body mass (BM)(-1)) or moderate (N = 6; 3.89 g CHO x kg BM(-1)) carbohydrate 
      diet. Milk and blood samples were collected before and after a nonexercise 
      session (control) and maximal, lactic acid-threshold (LAT), and 20% below the LAT 
      (LAT-20) intensities. RESULTS: The 30-min exercise LAT bout was more stressful 
      than the 30-min LAT-20 bout (rating of perceived exertion (RPE) = 15 vs 12, 
      respectively, P < 0.05). Milk LA was significantly higher at 0 min following 
      maximal exercise in the high and moderate CHO groups (1.27+/-0.56 and 1.52+/-0.49 
      mM, respectively) and following LAT exercise (0.19+/-0.16 and 0.25+/-0.12 mM, 
      respectively), when compared with the control session (0.08+/-0.03 and 
      0.09+/-0.05 mM, respectively). This was not observed following the LAT-20 
      exercise in the high and moderate CHO groups (0.11+/-0.04 and 0.12+/-0.08 mM, 
      respectively). Elevated milk LA persisted in the 30-min collection point after 
      maximal exercise only. There was no significant effect of dietary treatment on 
      milk or blood LA at any of the collection points. CONCLUSIONS: In lactating women 
      whose caloric needs are being met: 1) dietary CHO intake, within a practical 
      range, does not influence LA levels in breast milk at rest or after exercise; 2) 
      LA appearance in the milk is a function of exercise intensity; and 3) moderate 
      intensity exercise (RPE = 12) will not increase breast milk LA levels.
FAU - Quinn, T J
AU  - Quinn TJ
AD  - Department of Kinesiology, University of New Hampshire, Durham 03824, USA. 
      tjq@christa.unh.edu
FAU - Carey, G B
AU  - Carey GB
LA  - eng
PT  - Clinical Trial
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Med Sci Sports Exerc
JT  - Medicine and science in sports and exercise
JID - 8005433
RN  - 0 (Dietary Carbohydrates)
RN  - 33X04XA5AT (Lactic Acid)
SB  - IM
MH  - Adult
MH  - *Dietary Carbohydrates
MH  - Exercise/*physiology
MH  - Female
MH  - Humans
MH  - Lactation/physiology
MH  - Lactic Acid/*analysis
MH  - Milk, Human/*chemistry
MH  - Nutritional Requirements
MH  - Physical Endurance
EDAT- 1999/02/02 00:00
MHDA- 1999/02/02 00:01
CRDT- 1999/02/02 00:00
PHST- 1999/02/02 00:00 [pubmed]
PHST- 1999/02/02 00:01 [medline]
PHST- 1999/02/02 00:00 [entrez]
AID - 10.1097/00005768-199901000-00017 [doi]
PST - ppublish
SO  - Med Sci Sports Exerc. 1999 Jan;31(1):105-10. doi: 
      10.1097/00005768-199901000-00017.