Red Spinach Extract Increases Ventilatory Threshold during Graded Exercise Testing

)) on performance markers during graded exercise testing (GXT). Methods: For this randomized, double-blind, placebo (PBO)-controlled, crossover study, 15 recreationally-active participants (aged 23.1 ± 3.3 years; BMI: 27.2 ± 3.7 kg/m²) reported >2 h post-prandial and performed GXT 65–75 min post-RSE or PBO ingestion. Blood samples were collected at baseline (BL), pre-GXT (65–75 min post-ingestion; PRE), and immediately post-GXT (POST). GXT commenced with continuous analysis of expired gases. Results: Plasma concentrations of NO

_{3}^{-}

increased PRE (+447 ± 294%; p < 0.001) and POST (+378 ± 179%; p < 0.001) GXT with RSE, but not with PBO (+3 ± 26%, −8 ± 24%, respectively; p > 0.05). No effect on circulating nitrite (NO

_{2}^{-}

) was observed with RSE (+3.3 ± 7.5%, +7.7 ± 11.8% PRE and POST, respectively; p > 0.05) or PBO (−0.5 ± 7.9%, −0.2 ± 8.1% PRE and POST, respectively; p > 0.05). When compared to PBO, there was a moderate effect of RSE on plasma NO

_{2}^{-}

at PRE (g = 0.50 [−0.26, 1.24] and POST g = 0.71 [−0.05, 1.48]). During GXT, VO₂ at the ventilatory threshold was significantly higher with RSE compared to PBO (+6.1 ± 7.3%; p < 0.05), though time-to-exhaustion (−4.0 ± 7.7%; p > 0.05) and maximal aerobic power (i.e., VO₂ peak; −0.8 ± 5.6%; p > 0.05) were non-significantly lower with RSE. Conclusions: RSE as a nutritional supplement may elicit an ergogenic response by delaying the ventilatory threshold. View Full-Text

Keywords: Amaranthus dubius; submaximal; endurance exercise; nitrate; anaerobic threshold

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Moore, A.N.; Haun, C.T.; Kephart, W.C.; Holland, A.M.; Mobley, C.B.; Pascoe, D.D.; Roberts, M.D.; Martin, J.S. Red Spinach Extract Increases Ventilatory Threshold during Graded Exercise Testing. Sports 2017, 5, 80. https://doi.org/10.3390/sports5040080

AMA Style

Moore AN, Haun CT, Kephart WC, Holland AM, Mobley CB, Pascoe DD, Roberts MD, Martin JS. Red Spinach Extract Increases Ventilatory Threshold during Graded Exercise Testing. Sports. 2017; 5(4):80. https://doi.org/10.3390/sports5040080

Chicago/Turabian Style

Moore, Angelique N., Cody T. Haun, Wesley C. Kephart, Angelia M. Holland, Christopher B. Mobley, David D. Pascoe, Michael D. Roberts, and Jeffrey S. Martin. 2017. "Red Spinach Extract Increases Ventilatory Threshold during Graded Exercise Testing" Sports 5, no. 4: 80. https://doi.org/10.3390/sports5040080

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