Document Detail


Protein and carbohydrate supplementation during 5-day aerobic training enhanced plasma volume expansion and thermoregulatory adaptation in young men.
MedLine Citation:
PMID:  20689095     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We examined whether protein and carbohydrate (CHO) supplementation during 5-day training enhanced plasma volume (PV) expansion and thermoregulatory and cardiovascular adaptations in young men. Eighteen men [age 23 ± 4 (SD) yr] were divided into two groups according to supplements: placebo (CNT: 0.93 kcal/kg, 0.00 g protein/kg, n = 9) and protein and CHO (Pro-CHO: 3.6 kcal/kg, 0.36 protein/kg, n = 9). Subjects in both groups performed a cycling exercise at 70% peak oxygen consumption rate (VO2peak), 30 min/day, for 5 consecutive days at 30°C ambient temperature and 50% relative humidity and took either a placebo or Pro-CHO within 10 min after exercise for each day. Before and after training, PV at rest, heart rate (HR), and esophageal temperature (T(es)) during 30-min exercise at 65% of pretraining VO2peak in the same condition as training were determined. Also, the sensitivity of the chest sweat rate (ΔSR/ΔT(es)) and forearm vascular conductance (ΔFVC/ΔT(es)) in response to increased T(es) were determined. After training, PV and cardiac stroke volume (SV) at rest increased in both groups (P < 0.001) but the increases were twofold higher in Pro-CHO than CNT (P = 0.007 and P = 0.078, respectively). The increases in HR from 5 to 30 min and T(es) from 0 to 30 min of exercise were attenuated after training in both groups with greater attenuation in Pro-CHO than CNT (P = 0.002 and P = 0.072, respectively). ΔSR/ΔT(es) increased in CNT (P = 0.052) and Pro-CHO (P < 0.001) and the increases were higher in Pro-CHO than CNT (P = 0.018). ΔFVC/ΔT(es) increased in Pro-CHO (P < 0.001), whereas not in CNT (P = 0.16). Thus protein-CHO supplementation during 5-day training enhanced PV expansion and thermoregulatory adaptation and, thereby, the reduction in heat and cardiovascular strain in young men.
Authors:
Masaki Goto; Kazunobu Okazaki; Yoshi-ichiro Kamijo; Shigeki Ikegawa; Shizue Masuki; Ken Miyagawa; Hiroshi Nose
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Publication Detail:
Type:  Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-05
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  109     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-13     Completed Date:  2011-05-23     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1247-55     Citation Subset:  IM    
Affiliation:
Dept. of Sports Medical Sciences, Shinshu Univ. Graduate School of Medicine, 3-1-1 Asahi Matsumoto 390-8621, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Adult
Analysis of Variance
Bicycling
Body Temperature Regulation*
Dietary Carbohydrates / administration & dosage*
Dietary Proteins / administration & dosage*
Dietary Supplements*
Exercise*
Heat Stress Disorders / blood,  physiopathology,  prevention & control*
Hemodynamics
Humans
Japan
Male
Oxygen Consumption
Plasma Volume*
Serum Albumin / metabolism
Sweating
Time Factors
Young Adult
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Dietary Proteins; 0/Serum Albumin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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