title: Cordyceps sinensis- and Rhodiola rosea-based supplementation in male cyclists and its effect on muscle tissue oxygen saturation.
abstract: Cordyceps sinensis (Cs) and Rhodiola rosea (Rr) are herbs used in traditional Chinese medicine to treat a multitude of ailments as well as to enhance performance. The purpose of this research was to examine the effects of a formula containing Cs and Rr (Cs-Rr) on circulatory dynamics, specifically muscle tissue oxygen saturation (Sto(2)), in male subjects during maximal exercise. This study followed a double blind, randomized, placebo-treatment, pre-post test design. Capsules were administered to 8 subjects who were randomly assigned to 1 of 2 groups. The treatment group received Cs-Rr, and the control group received a placebo. All subjects performed 2 exercise stress tests to volitional fatigue on a cycle load ergometer. There were no significant (p </= 0.05) differences in Sto(2) slope, Sto(2) threshold (Sto(2T)), Vo(2)max, ventilatory threshold (V(T)), or time to exhaustion (T(E)) between or within the treatment or control group. In conclusion, Cs-Rr did not significantly enhance Sto(2).
authors.affiliation: Department of Health Sciences, McLennan Community College, Waco, Texas 76708, USA. scolson@mclennan.edu
authors.forename: Sheree N
authors.initials: SN
authors.lastname: Colson
authors.forename: Frank B
authors.initials: FB
authors.lastname: Wyatt
authors.forename: Deborah L
authors.initials: DL
authors.lastname: Johnston
authors.forename: Lance D
authors.initials: LD
authors.lastname: Autrey
authors.forename: Youlonda L
authors.initials: YL
authors.lastname: FitzGerald
authors.forename: Conrad P
authors.initials: CP
authors.lastname: Earnest
mesh_terms: D000293:Adolescent; D000328:Adult; D001642:Bicycling / Q000502:physiology*; D032661:Cordyceps; D019587:Dietary Supplements; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000098:blood supply / Q000187:drug effects / Q000378:metabolism*; D010101:Oxygen Consumption / Q000187:drug effects* / Q000502:physiology; D008517:Phytotherapy / Q000379:methods*; D028321:Plant Preparations / Q000008:administration & dosage; D012039:Regional Blood Flow / Q000187:drug effects / Q000502:physiology; D029771:Rhodiola; D016896:Treatment Outcome
chemical_list: D028321:Plant Preparations