Browsing by Author "Nyakayiru, J."

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A Nitrate-Rich Vegetable Intervention Elevates Plasma Nitrate and Nitrite Concentrations and Reduces Blood Pressure in Healthy Young Adults
Avoort, C.M.T. van der ; Jonvik, K.L. ; Nyakayiru, J. ; Loon, L.J.C. van ; Hopman, M. ; Verdijk, L.B.
2020, Article / Letter to editor (Journal of the Academy of Nutrition and Dietetics, (2020))
Foamrolling: een hype of de moeite waard?
Hilkens, L.P.M. ; Kuipers, R. ; Nyakayiru, J.
2020, Article / Letter to editor ((2020))
Repeated-sprint performance and plasma responses following beetroot juice supplementation do not differ between recreational, competitive and elite sprint athletes
Jonvik, K.L. ; Nyakayiru, J. ; Dijk, J.W. van ; Maase, K. ; Ballak, S.B. ; Senden, J.M.G. ; Loon, L.J.C. van ; Verdijk, L.B.
2018, Article / Letter to editor (European Journal of Sport Science, vol. 18, iss. 4, (2018), pp. 524-533)
Habitual Dietary Nitrate Intake in Highly Trained Athletes.
Jonvik, K.L. ; Nyakayiru, J. ; Dijk, J.W. van ; Wardenaar, F.C. ; Loon, L.J.C. van ; Verdijk, L.B.
2017, Article / Letter to editor (International Journal of Sport Nutrition and Exercise Metabolism, vol. 27, iss. 2, (2017), pp. 148-157)Although beetroot juice, as a nitrate carrier, is a popular ergogenic supplement among athletes, nitrate is consumed through the regular diet as well. We aimed to assess the habitual dietary nitrate intake and identify the main contributing food sources in a large group of highly trained athletes. Dutch highly trained athletes (226 women and 327 men) completed 2-4 web-based 24-hr dietary recalls and questionnaires within a 2- to 4-week period. The nitrate content of food products and food groups was determined systematically based on values found in regulatory reports and scientific literature. These were then used to calculate each athlete's dietary nitrate intake from the web-based recalls. The median[IQR] habitual nitrate intake was 106[75-170] mg/d (range 19-525 mg/d). Nitrate intake correlated with energy intake (ρ = 0.28, p < .001), and strongly correlated with vegetable intake (ρ = 0.78, p < .001). In accordance, most of the dietary nitrate was consumed through vegetables, potatoes and fruit, accounting for 74% of total nitrate intake, with lettuce and spinach contributing most. When corrected for energy intake, nitrate intake was substantially higher in female vs male athletes (12.8[9.2-20.0] vs 9.4[6.2-13.8] mg/MJ; p < .001). This difference was attributed to the higher vegetable intake in female vs male athletes (150[88-236] vs 114[61-183] g/d; p < .001). In conclusion, median daily intake of dietary nitrate in highly trained athletes was 106 mg, with large interindividual variation. Dietary nitrate intake was strongly associated with the intake of vegetables. Increasing the intake of nitrate-rich vegetables in the diet might serve as an alternative strategy for nitrate supplementation.
Glycemic control during consecutive days with prolonged walking exercise in individuals with type 1 diabetes mellitus.
Dijk, J.W. van ; Eijsvogels, T.M.H. ; Nyakayiru, J. ; Schreuder, T.H. ; Hopman, M.T.E. ; Thijssen, D.H. ; Loon, L.J.C. van
2016, Article / Letter to editor (Diabetes Research and Clinical Practice, vol. 117, (2016), pp. 74-81)AIMS: Despite its general benefits for health, exercise complicates the maintenance of stable blood glucose concentrations in individuals with type 1 diabetes. The aim of the current study was to examine changes in food intake, insulin administration, and 24-h glycemic control in response to consecutive days with prolonged walking exercise (~8h daily) in individuals with type 1 diabetes. METHODS: Ten individuals with type 1 diabetes participating in the worlds' largest walking event were recruited for this observational study. Simultaneous measurements of 24-h glycemic control (continuous glucose monitoring), insulin administration and food intake were performed during a non-walking day (control) and during three subsequent days with prolonged walking exercise (daily distance 40 or 50km). RESULTS: Despite an increase in daily energy (31±18%; p<0.01) and carbohydrate (82±71g; p<0.01) intake during walking days, subjects lowered their insulin administration by 26±16% relative to the control day (p<0.01). Average 24-h blood glucose concentrations, the prevalence of hyperglycemia (blood glucose >10 mmol/L) and hypoglycemia (blood glucose <3.9mmol/L) did not differ between the control day and walking days (p>0.05 for all variables). The prolonged walking exercise was associated with a modest increase in glycemic variability compared with the control day (p<0.05). CONCLUSION: Prolonged walking exercise allows for profound reductions in daily insulin administration in persons with type 1 diabetes, despite large increments in energy and carbohydrate intake. When taking such adjustments into account, prolonged moderate-intensity exercise does not necessarily impair 24-h glycemic control.
Effects Of Acute Versus 6-day Sodium Nitrate Supplementation On Time-trial Performance In Trained Cyclists
Jonvik, K.L. ; Nyakayiru, J. ; Pinckaers, PJM ; Dijk, J.W. van ; Senden, J.M.G. ; Loon, L.J.C. van ; Verdijk, L.B.
2015, Article / Letter to editor (Medicine and Science in Sports and Exercise, vol. 47, iss. 5, (2015), pp. CP540-CP541)

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