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| Effects of Antarctic krill oil on aerobic metabolism and anti-fatigue ability of long-distance runners |
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| KeyWord:Antarctic krill oil aerobic capacity blood rheology antioxidant anti-inflammatory |
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| Abstract: |
| In order to investigate the effects of different doses of Antarctic krill oil supplementation on aerobic capacity and related indexes of blood metabolism in long-distance runners, 36 male long-distance runners were selected and randomly divided into four groups:placebo group (PL), low-dose krill oil group (L group), medium -dose krill oil group (M group), high-dose krill oil group (H group). A double-blind randomized controlled experiment was conducted. The PL group received 1 g soybean oil daily, and the L group, M group and H group received 1, 2 g and 3 g Antarctic krill oil daily for a total of 4 weeks. The maximum oxygen uptake (VO2max) and anaerobic threshold (AT)were measured by increasing load test using Bruce scheme.Blood lactic acid was measured immediately after exercise at 0, 3, 5, 7, 9 min, and the elimination rate of blood lactic acid was calculated.The cubital venous blood was collected, and blood routine, blood rheology-related indexes, serum oxidation/antioxidation indexes and inflammatory-related factors indexes were analyzed.The results showed that there were no significant differences in VO2max, AT and elimination rate of blood lactic acid between the krill oil groups and PL group before and after the intervention (p>0.05).Compared with PL group,after 4 weeks of intervention, there was no significant differences in the blood routine indexes in the krill oil groups(p>0.05), and the mean erythrocyte hemoglobin concentration (MCHC)in M group very significantly higher after intervention than that before intervention (p<0.01), the MCHC in H group was significantly higher after intervention than that before intervention(p<0.05).Compared with the PL group, after 4 weeks of intervention, the plasma viscosity in L group, M group and H group significantly decreased(p<0.05), and the plasma viscosity of L, M and H groups significantly lower after intervention than that before intervention (p<0.05).Compared with the PL group, after 4 weeks of intervention and 24 h after intensive exercise, the activity of serum antioxidant indexes in groups M and H significantly increased (p<0.05). Compared with the PL group, after 4 weeks of intervention and 24 h after intensive exercise, the expression of serum inflammatory factors in M group and H group significantly decreased (p<0.05). In conclusion, supplementation with Antarctic krill oil can not directly change the athletes′ aerobic capacity, but 4-week Antarctic krill oil intervention can improve the key link of blood transport in the aerobic power chain.In addition, the supplementation of medium- and high-dose of Antarctic krill oil for 4 weeks can significantly improve the body′s antioxidant/anti-inflammatory ability after exercise and promote fatigue recovery. |
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