title: Different effects of concentric and eccentric muscle actions on plasma volume.
abstract: The effects of concentric (CON) and eccentric (ECC) contractions on Delta plasma volume (PV), heart rate (HR), and lactate in responses to protocols in different body positions were investigated. CON or ECC contractions were performed in either a single-exercise (6 sets of 12 repetitions of leg extensions completed at 80% of 12 repetition maximum [12RM] with 3-minute rest periods) or multiexercise (4 sets of 10 repetitions for both CON and ECC trials of bench press, leg extension, military press, and leg curl at 80% of 10RM with 90-second rest periods) protocols. HR and lactate increased significantly for both protocols from pre- to postexercise for CON but not ECC trials. DeltaPV was greater following both CON single-exercise (-11.48 +/- 1.38%) and multiexercise (-4.64 +/- 0.33%) trials vs. ECC single-exercise (-1.62 +/- 1.69%) and multiexercise (-1.26 +/- 1.20) trials. Data demonstrate ECC exercise in response to single and multiexercise protocols at the same absolute workload as CON exercise produces less cardiovascular stress.
authors.affiliation: Department of Kinesiology and Health Studies, Southeastern Louisiana University, Hammond, LA 70402, USA. durandrj@pbrc.edu
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Durand
authors.forename: Robert R
authors.initials: RR
authors.lastname: Kraemer
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Hollander
authors.forename: James L
authors.initials: JL
authors.lastname: Tryniecki
authors.forename: Melanie
authors.initials: M
authors.lastname: Wall
authors.forename: Lloyd
authors.initials: L
authors.lastname: Saxon
authors.forename: Edward P
authors.initials: EP
authors.lastname: Hebert
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D015444:Exercise / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007773:Lactates / Q000097:blood; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D010953:Plasma Volume
chemical_list: D007773:Lactates