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BACKGROUND: This study investigated the acute effects of various doses of nitrate-rich beetroot juice on the responses to high-intensity interval exercise in women. METHODS: A double-blinded, randomized, placebo-controlled, crossover trial was conducted with 13 recreationally active young women (age = 23 ± 2 years). All participants performed interval exercise (8 × 1-min bouts of cycling at 85% of peak power output [PPO] interspersed with 1-min active recovery at 20% of PPO) 2.5 h after consumption of the randomly assigned beetroot juice containing 0 mmol (placebo), 6.45 mmol (single-dose), or 12.9 mmol (double-dose) NO3-. The heart rate (HR), blood pressure, blood lactate, blood glucose, oxygen saturation, rating of perceived exertion (RPE), and emotional arousal were assessed. RESULTS: Nitrate supplementation significantly altered the HR and RPE responses across the three trials. The mean HR was lower in the single- and double-dose groups than in the placebo control group during both work intervals and recovery periods, as well as across the overall protocol (all p < .05). The mean RPE was lower in the single- and double-dose groups than in the control group during recovery periods and across the overall protocol (all p < .001). However, there was no significant difference in either HR or RPE between the single- and double-dose groups at any time point. CONCLUSIONS: Acute nitrate ingestion led to significant decreases in the mean HR and RPE during high-intensity interval exercise, but no additional benefit was observed with higher nitrate content. These findings may assist practitioners in implementing more effective nitrate supplementation strategies during high-intensity interval exercise.
Assuntos
Antioxidantes , Nitratos , Feminino , Humanos , Adulto Jovem , Adulto , Estudos Cross-Over , Ciclismo , GlicemiaRESUMO
In March 2020, the outflow of age limited videos from ICU in Spain inspired us to rethink whether there is age discrimination in the allocation of scarce medical resources. This paper frist reflected on the problem of age discrimination caused by this phenomenon from four moral intuitions: the sacred view of life, the quality of life and values, public health ethics and Chinese culture, and then examined whether it is illegal from the legal level, finally pointed out the negative impact on the society, and put forward that taking age as the standard for the allocation of scarce medical resources is not suitable for China’s national conditions.
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In March 2020, the outflow of age limited videos from ICU in Spain inspired us to rethink whether there is age discrimination in the allocation of scarce medical resources. This paper frist reflected on the problem of age discrimination caused by this phenomenon from four moral intuitions: the sacred view of life, the quality of life and values, public health ethics and Chinese culture, and then examined whether it is illegal from the legal level, finally pointed out the negative impact on the society, and put forward that taking age as the standard for the allocation of scarce medical resources is not suitable for China’s national conditions.
RESUMO
Hedyotis diffusa is an antioxidant, antibacterial Chinese herbal medicine which has anti-tumor, antioxidant, antibacterial, enhance the effect of nonspecific immunity and protection of the nervous system. Clinical application shows thatHedyotis diffusa has good efficacy on treatment of malignant tumors and inflammatory diseases. Referred to some papers published at home and abroad, this paper summarized from the aspects of active ingredient and antitumor effect. Results showes that its anti-tumor effect exactly, anti-tumor mechanism may be associated with a variety of molecular mechanisms, which remains to be further in-depth study.