tlk
2013-02-28, 12:22
Effects of Supplemental Carbohydrate Ingestion During Superimposed Electromyostimulation Exercise in Elite Weight Lifters.
ABSTRACT: The purpose of this investigation was to test the effects of carbohydrate supplementation on blood parameters and force output during superimposed electromyostimulation (SEMS) single leg isometric contractions. We hypothesized that carbohydrate ingestion prior and during muscle contractions would lead to greater glucose availability and greater total force output for the session. Six elite resistance trained male subjects participated in a randomized, counterbalanced, double blind study. Subjects were randomly assigned to placebo (PL) or carbohydrate (CHO). Subjects in CHO consumed 1 g carbohydrate•kg body mass loading dose and 0.17 g carbohydrate•kg body mass every six min during exercise protocol. PL received an equal volume of a solution made of saccharin/aspartame. Exercise protocol consisted of repeated 20 s isometric contractions of quadriceps muscle at 50% maximal voluntary contraction followed by 40 s rest until failure occurred. Importantly, quadriceps maximal voluntary contraction with SEMS was performed in beginning and then every 5 min during the last 3 s of isometric contractions throughout the exercise protocol. Venous blood samples were taken pre-, immediately post-, and at 5 min post- exercise and analyzed for glucose, nonesterified fatty acids, and glycerol. Our results indicate that CHO ingestion increased (p < 0.05) plasma glucose, but no significant differences (p > 0.05) were detected for nonesterified fatty acids or glycerol. Importantly, total force output during exercise protocol was higher (p < 0.05) in CHO compared to PL. Therefore, our data suggest that CHO supplementation prior to and during exercise may be beneficial for individuals performing high-volume resistance training.
https://www.ncbi.nlm.nih.gov/pubmed/23442284
ABSTRACT: The purpose of this investigation was to test the effects of carbohydrate supplementation on blood parameters and force output during superimposed electromyostimulation (SEMS) single leg isometric contractions. We hypothesized that carbohydrate ingestion prior and during muscle contractions would lead to greater glucose availability and greater total force output for the session. Six elite resistance trained male subjects participated in a randomized, counterbalanced, double blind study. Subjects were randomly assigned to placebo (PL) or carbohydrate (CHO). Subjects in CHO consumed 1 g carbohydrate•kg body mass loading dose and 0.17 g carbohydrate•kg body mass every six min during exercise protocol. PL received an equal volume of a solution made of saccharin/aspartame. Exercise protocol consisted of repeated 20 s isometric contractions of quadriceps muscle at 50% maximal voluntary contraction followed by 40 s rest until failure occurred. Importantly, quadriceps maximal voluntary contraction with SEMS was performed in beginning and then every 5 min during the last 3 s of isometric contractions throughout the exercise protocol. Venous blood samples were taken pre-, immediately post-, and at 5 min post- exercise and analyzed for glucose, nonesterified fatty acids, and glycerol. Our results indicate that CHO ingestion increased (p < 0.05) plasma glucose, but no significant differences (p > 0.05) were detected for nonesterified fatty acids or glycerol. Importantly, total force output during exercise protocol was higher (p < 0.05) in CHO compared to PL. Therefore, our data suggest that CHO supplementation prior to and during exercise may be beneficial for individuals performing high-volume resistance training.
https://www.ncbi.nlm.nih.gov/pubmed/23442284