Campbell, David Sean2024-08-132024-08-1320002000https://hdl.handle.net/1828/17378The purpose of this study was to observe muscle oxygenation and blood volume changes elicited by 10RM and 4RM weight lifting in trained (ages 23.8 ± 3.5 years, sum of 4 arm skinfolds 15.2 ± 3.7 mm, arm girth 35.7 ± 3.0 cm) and untrained trained (ages 25.3 ± 3.6 years, sum of 4 arm skinfolds 16.6 ± 3.2 mm, arm girth 28.4 ± 3.1 cm) subjects. 24 college aged males volunteered for the study and were assigned to the trained (N=14) or untrained (N=10) group based on training experience. Each subject completed a 10RM, 4RM and muscle ischemia protocol in random order on separate days. The 10RM protocol consisted of 3 sets of right arm curl exercise at a 10RM load. The 4RM protocol consisted of 4 sets of arm curls at a 4RM load. Each set of exercise was separated by 3 min rest. In the muscle ischemia protocol, subjects had blood flow occluded for 8min by a pressure cuff inflated to 250mmHg. Blood volume and tissue oxygenation of the right biceps brachii muscle were monitored non-invasively in all protocols using a near-infrared spectrophotometer placed on the mid-point of the medial muscle belly of the biceps brachii. Both trained and untrained subjects showed marked decreases in blood volume and tissue oxygenation during each set of exercise in both the 4RM and 10RM protocols. No differences existed between trained and untrained groups in a set-wise comparison of muscle oxygenation and blood volume in the 10RM and 4RM protocols. No set-wise differences were found for the 10RM or 4RM protocol for either the trained or untrained subjects. Further, no differences existed between 10RM and 4RM deoxygenation and blood volume values for the trained and untrained groups. It was concluded that blood volume and oxygenation decrease during resistance exercise.73 pagesAvailable to the World Wide WebThesis