THE ACUTE EFFECTS OF RHODIOLA CRENULATA ON SUBMAXIMAL EXHAUSTIVE PERFORMANCE UNDER HEAT STRESS

Authors

  • Saiphon KONGKUM
  • Suthasinee Kongthongsung College of sports science and technology, Mahidol
  • Waree WIDJAJA
  • Rungchai CHAUNCHAIYAKUL

Keywords:

Rhodiola Crenulata / Supplement / Exercise Performance / Exercise in the heat

Abstract

Introduction: Rhodiola crenulata is a traditional Chinese herb, which is widely used for health promotion in the Tibet and Himalayan areas. Rhodiola extract contains salidroside, a biologically active compound, which potentially has ergogenic and adaptogenic benefits, to decrease inflammation and improve exercise tolerance. Purpose: This study aimed to investigate the effects of Rhodiola crenulata on submaximal exercise performance and physiological responses under heat stress (~35.5±0.16°C and relative humidity of ~58.6±2.34%). Methods: Thirteen healthy males (aged, 20.9±1.7 yrs; body mass, 67.2±7.8 kg; height, 172.7±5.4 cm; peak oxygen consumption
O2peak, 49.0±3.4 mL.kg-1.min-1) volunteered to participate in this randomized, double-blind, crossover study. Participants completed three exercise sessions. On day 1,
O2peak was determined and used for establishing a workload of 70-75%
O2peak in the subsequent day 2 and 3. On day 2 and 3, participants were randomized to receive a single 500 milligrams dose of either Rhodiola crenulata (RC) or Placebo (PL) an hour before completing submaximal exhaustive treadmill running at 70-75%
O2peak under heat stress. Cardiac, respiratory, metabolic, and thermoregulatory responses, and ratings of perceived exertion, were measured before and during the test. Time to exhaustion (TTE), speed and distance covered were recorded at the end of testing. Results: Seven participants (out of 13) had a longer TTE and covered a greater distance when consuming RC extract although there was no significant difference between conditions (TTE: PL, 30.2±3.7 min; RC, 29.8±2.0 min., and distance covered: PL, 4.7±0.6 km; RC, 4.9±0.4 km, respectively). Physiological responses: cardiac, respiratory, metabolic and thermoregulatory functions were all similar at rest and during submaximal exercise between conditions (p>0.05). The perception of thermal sensation and discomfort were similar at rest and exhaustion. However, these subjective variables were rated significantly different in the 9th min (PL, 2.8±0.2; RC, 1.8±0.2, and PL, -2.5±0.2; RC, 1.6±0.2, p<0.05, respectively). Conclusion: Our finding suggests that a 500 mg acute single dose of RC has no additive beneficial effect on submaximal exhaustive performance compared to a placebo under heat stress.
(Journal of Sports Science and Technology 2017; 17(2): 83-95)

Keywords: Rhodiola Crenulata / Supplement / Exercise Performance / Exercise in the heat

*Corresponding author: Suthasinee Kongthongsung
College of Sports Science and Technology,
Mahidol University, Nakhon Pathom, Thailand. 73170
E-mail: suthasinee.kyo@gmail.com

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Published

2017-12-25

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Research Article