Interval Walking Training and Nutritional Intake to Increase Plasma Volume in Elderly.
Med Sci Sports Exerc
; 50(1): 151-158, 2018 Jan.
Article
in En
| MEDLINE
| ID: mdl-28863074
ABSTRACT
PURPOSE:
Aerobic training-induced plasma volume (PV) expansion improves thermoregulation, and carbohydrate (CHO) + whey protein supplementation enhanced the effects in older people; however, these were suggested by studies on gym-based cycling training but not on home-based interval walking training (IWT). Moreover, long-term walking training effects on PV remain unknown.METHODS:
Seventeen male and 10 female subjects (~69 yr), having performed IWT for ≥24 months before the study, were used. After pre-intervention measurement (PRE) of PV, plasma albumin content (Albcont), fasting glucose concentration ([Glc]f), and HbA1c, the subjects were randomly divided into two groups CHO and Pro-CHO, either consuming CHO (22.5 g) alone or CHO (15 g) + whey protein (10 g), respectively, during additional 5-month IWT from May to November, 2009. After the additional IWT, we measured the same variables again (postintervention measurement).RESULTS:
The baseline PV and Albcont were significantly correlated with the number of IWT days for the 12 months preceding PRE (r = 0.716, P < 0.001 and r = 0.671, P < 0.001, respectively). In postintervention, PV and Albcont marginally decreased in CHO from the baselines (P = 0.081 and P = 0.130, respectively) with increased HbA1c (P < 0.001) after correction for the baseline [Glc]f by ANCOVA, but these values remained unchanged in Pro-CHO (both, P > 0.74), with significant differences in the changes between groups (P = 0.020, P = 0.041, and P = 0.018 respectively).CONCLUSIONS:
PV was proportional to the number of IWT days for 12 months and a CHO + whey protein supplementation during the 5-month IWT prevented PV reduction for the period of no supplementation, which might be partially linked with blood glucose control mechanisms.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Plasma Volume
/
Dietary Carbohydrates
/
Dietary Proteins
/
Walking
/
Dietary Supplements
Type of study:
Clinical_trials
Limits:
Aged
/
Female
/
Humans
/
Male
Language:
En
Journal:
Med Sci Sports Exerc
Year:
2018
Document type:
Article
Affiliation country:
Japón