title: Adaptations of forearm circulation to varied intensities and sets of heavy exercise.
abstract: Nine male and five female college students were tested on four occasions to determine the effects of various exhaustive weightlifting stimuli on forearm blood flow as measured by strain-gauge plethysmography. Maximum voluntary dynamic wrist curl strength was determined in the first session, which was followed by random treatments of exercise with 70, 80, and 90% of the weight subjects could curl only one time (1 RM) on three separate days. During each treatment, after a 15-min rest, subjects performed three sets of exercise movements at a pace of 0.5 Hz until voluntary exhaustion. Each set of continuous repetitions was followed by a 166-s recovery period. Blood flows (ml flow X 100 ml tissue-1 X min-1) were determined at 10, 36, 62, 88, 114, 140, and 166 s of recovery. Data were analyzed using ANOVA tests for a three (intensities) by three (sets) complete factorial design with repeated measures on all factors. Generally, 90% flows were significantly (P less than 0.05) lower than both 70 and 80% flows. Also, 70% flows were statistically equal to 80% flows. There were significant (P less than 0.05) set effects at 10, 36, 114, and 166 s of recovery. Blood flows for set 3 exceeded those for set 1 at 10, 36, 114, and 166 s of recovery, and blood flows for set 2 exceeded those for set 1 at 166 s of recovery.
mesh_terms: D005260:Female; D005542:Forearm / Q000098:blood supply*; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D009132:Muscles / Q000098:blood supply; D005082:Physical Exertion; D012039:Regional Blood Flow; D014891:Weight Lifting