Scott M. Hasson

Effect of carbohydrate ingestion on exercise of varying intensity and duration. Practical implications.

The major emphasis of this article is to review the many studies dealing specifically with(1) different types of exercice (in terms of duration and intensity) that might be aided by carbohydrate ingestion;(2) the varying metabolic effects of the different carbonhydrates that are commonly ingested;(3) timing of ingestion; and(4) practical implications of carbohyrate ingestion for endurance exercice activity

Effects of glucose versus fructose ingestion on blood glucose concentration during rest and exercise

Abstract Ten healthy, nondiabetic male subjects (18–35 yrs.) ingested either fructose, glucose, or a sham solution in doseage of 0.75 gms/kg body weight, and were assigned to the rest or exercise group (80% VO 2 max for 30-min). Subjects participated in all six treatments which were: Fructose-Exercise (FE), Glucose-Exercise (GE), Control-Exercise (CE), Fructose-Rest (FR), Glucose-Rest (GR), and Control-Rest (CR). Blood samples were drawn immediately prior to ingestion, 30-min post ingestion (immediately prior to initiation of rest or exercise), and then at 10, 20, and 30 min into the rest or exercise bout. All samples were analyzed for glucose. Both GE and FE treatment initially elevated blood glucose levels (GE 57.0±9.8%, FE 25.0±6.5%). Once exercise was initiated following glucose ingestion, blood glucose declined very rapidly and ended below baseline (−5.1±6.5%). Following FE treatment, blood glucose declined initially in the first 10-min of exercise, but then increased significantly as exercise continued (25.3±13.3%). These results suggest, many of the frequently observed symptoms of fatigue related to hypoglycemia during endurance exercise events might be avoided with fructose ingestion prior to competition.

Dexamethasone iontophoresis: effect on delayed muscle soreness and muscle function

The purpose of this study was to evaluate the pain alleviating effect of dexamethasone iontophoresis on delayed onset muscle soreness (DOMS) produced via an eccentric exercise bout, and to determine the effect on muscle function. Baseline data were collected on 18 female subjects for maximum isometric knee extension contraction (MVC), knee extension peak torque (PT), knee extension work (W), and muscle soreness perception (SP). All values were subsequently reassessed 24 and 48 hours after a 10-min bout of bench stepping. Immediately following the 24-hr reassessment, the experimental (E) (N = 6) and placebo (P) (N = 6) groups received iontophoresis treatment while the control (C) group (N = 6) received no treatment. Percent deviation from baseline of SP was significantly less at 48 hours (p less than 0.05) for the E group compared to P and C groups. However, MCV, PT, and W were no different between the three groups at 48 hours post muscle soreness bout.