Effects of a commercial herbal-based formula on exercise performance in cyclists
ABSTRACT We examined the effects of a commercially marketed herbal-based formula purported to increase endurance on oxygen consumption (VO2) in 17 competitive category III/IV amateur cyclists [mean (SEM) age: 31.1 (1.8) yr; height: 178.5 (1.8) cm; weight: 77.1 (1.6) kg].
Each cyclist participated in two (pre/post) cycling tests progressing 25 W.4 min(-1) starting at 100 W administered in a randomized, placebo-controlled, double-blind fashion. The second trial was performed 14 d after the ingestion of a manufacturer recommended loading phase (4 d x 6 caps.d(-1)) and a maintenance phase (11 d x 3 caps.d(-1)). Three treatment capsules contained 1000 mg of Cordyceps sinensis (CS-4) and 300 mg Rhodiola rosea root extract as the primary ingredients; 800 mg of other ingredients included calcium pyruvate, sodium phosphate, potassium phosphate, ribose, and adenosine and 200 mcg of chromium.
Using a 2 x 2 ANOVA, we observed no significant treatment effect for any between or within group variables including peak VO2 [treatment 4.14 (0.2) L.min(-1); placebo 4.10 (0.2) L.min(-1)], time to exhaustion [treatment 38.47 (1.7) min; placebo 36.95 (1.8) min], peak power output (PO) [treatment 300.00 (12.1) W; placebo 290.63 (12.9) W], or peak heart rate. We also observed no differences for any subpeak exercise variable including the PO eliciting 2 mmol.L(-1) blood lactate (BLa) [treatment 201.00 (18.1) W; placebo 167.50 (19.2) W] and 4 mmol.L(-1) BLa [treatment 235.88 (15.8) W; placebo 244.78 (14.9) W], ventilatory threshold, respiratory compensation point, or Vo2 L.min(-1) gross efficiency at each stage.
A 2-wk ingestion schema of a commercial herbal-based formula is insufficient to elicit positive changes in cycling performance.
SourceAvailable from: Michał Tomczyk[Show abstract] [Hide abstract]
ABSTRACT: As a society we are increasingly concerned about our physical appearance. For example, as much as 24% of people in developed countries admittedly exercise to improve their performance. Professional sportsmen and amateurs alike are in a constant search for new means that will enable them better sport results in shorter time. Among those means, a prominent place belongs to dietary supplements. However, the producers often advertise products whose use in sports is neither scientifically founded nor safe. This brings on an irrational use of herbal supplements which sometimes leads to unwanted side effects, but is more often of little use. Thus, the aim of this review will be to systematically evaluate some of the herbal supplements that are used as adaptogenic and ergogenic aids in sport. The review will include available data on Rhodiola rosea, Withania somnifera, Schisandra chinensis, Tribulus terrestris, Vitis vinifera, Citrus aurantium, and others. Their effects, active ingredients as well as possible adverse effects will be discussed with special focus on clinical studies.Current Drug Targets 04/2013; 14:1079-1092. DOI:10.2174/1389450111314090016 · 3.60 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: Cordyceps spp. (Clavicipitaceae) are well-known medicinal mushrooms used traditionally by indigenous and local communities throughout the world for the treatment of various ailments. Cordyceps robertsii has been used (as a part of awheto) by the Maori people as food and in traditional Maori tattoo, or ta-moko; and there is some evidence of traditional rongoa (medicinal) use. There is only limited scientific evidence of their bioactivity and potential for use in this area. This research aims to identify and quantify adenosine and cordycepin in C. robertsii from New Zealand by high-performance liquid chromatography (HPLC). We can report the presence of adenosine and that the level of this nucleoside in C. robertsii is at least comparable to that found in C. sinensis. The research also demonstrates that the presence of adenosine in C. robertsii varies, depending on factors including environment, climate, host organism, and nutrition. We can also report the absence of cordycepin in C. robertsii.International Journal of Medicinal Mushrooms 01/2008; 10(1):55-63. DOI:10.1615/IntJMedMushr.v10.i1.70 · 1.12 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: The present study was aimed to evaluate the effect of natural specimen and laboratory cultured mycelia of Cordyceps sinensis on neuromuscular activity in mice. The powder of natural specimen and laboratory cultured Cordyceps sinensis was orally administered at the dose rate of 100, 300 and 500 mg/kg for 30 days. Natural specimen and in vitro propagated Cordyceps sinensis showed significant (P<0.05) enhancement in neuromuscular endurance and antidepressant activity at 300 and 500 mg/kg as compared to the control group. However, the fungus did not proved to be as effective as fluoxetine in exhibiting antidepressant action. Muscular endurance was determined on a Rota rod apparatus while antidepressant (mood elevating) activity was measured on a photoactometer in Swiss albino mice. The effects produced by both natural specimens and laboratory cultured Cordyceps sinensis were comparable and showed almost equal potency.Indian Journal of Pharmaceutical Sciences 76(5):458-461. · 0.30 Impact Factor