Effect of pre-exercise carbohydrate ingestion on substrate consumption in persons with spinal cord injury.
OBJECTIVE
To investigate the influence of pre-exercise carbohydrate ingestion on fat and carbohydrate oxidation during prolonged arm cranking exercise in persons with spinal cord injury.


METHODS
Six male paraplegic subjects (PS, Ll-Th3, 46.3+/-6.6 years) and seven able-bodied subjects (AB, 43.1+/-4.6 years) were volunteered to participate in the present study.


METHODS
The subjects were required to consume a glucose solution (1 g kg(-1) body mass and 500 ml plain water; glucose experiment) or only plain water (water experiment) before the prolonged exercise. Then the subjects performed for 1-h arm cranking exercise at a moderate workload.


RESULTS
In the water experiment, the carbohydrate oxidation slightly decreased and the fat oxidation increased continuously in AB. In contrast, the carbohydrate and fat oxidation of PS was constant during the exercise in the water experiment. In the glucose experiment, the fat oxidation did not rise and the carbohydrate oxidation was constant until the end of the exercise in PS and AB. PS oxidized more fat than AB in the glucose experiment (P<0.05), but no significant difference was found between PS and AB in the water experiment.


CONCLUSIONS
Using a wheelchair in daily life regularly was regarded as an exercise training that disciplined PS indirectly and is considered to cause PS to have more percentage of type I fiber than AB in the anterior deltoid muscle. Thus, the distribution of muscle fiber type in anterior deltoid muscle might be one of the factors that impacted the fat oxidation of PS in glucose experiment.
Jung
W
W
Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-hiroshima City, Hiroshima, Japan. wen2jung@ms58.hinet.net
Yamasaki
M
M
D000203:Activities of Daily Living; D000328:Adult; D000704:Analysis of Variance; D004734:Energy Metabolism / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005230:Fatty Acids, Nonesterified / Q000378:metabolism; D005947:Glucose / Q000008:administration & dosage*; D006801:Humans; D007328:Insulin / Q000097:blood; D019344:Lactic Acid / Q000097:blood; D008297:Male; D008875:Middle Aged; D010084:Oxidation-Reduction; D010807:Physical Endurance; D013119:Spinal Cord Injuries / Q000178:diet therapy / Q000378:metabolism / Q000534:rehabilitation
D005230:Fatty Acids, Nonesterified; D007328:Insulin; D019344:Lactic Acid; D005947:Glucose