Τίτλος:
Acute L-citrulline supplementation increases nitric oxide bioavailability but not inspiratory muscle oxygenation and respiratory performance
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
The present study aimed to investigate whether acute L-citrulline supplementation would affect inspiratory muscle oxygenation and respiratory performance. Twelve healthy males received 6 g of L-citrulline or placebo in a double-blind crossover design. Pulmonary function (i.e., forced expired volume in 1 s, forced vital capacity and their ratio), maximal inspiratory pressure (MIP), fractional exhaled nitric oxide (NO•), and sternocleidomastoid muscle oxygenation were measured at baseline, one hour post supplementation, and after an incremental resistive breathing protocol to task failure of the respiratory muscles. The resistive breathing task consisted of 30 inspirations at 70% and 80% of MIP followed by continuous inspirations at 90% of MIP until task failure. Ster-nocleidomastoid muscle oxygenation was assessed using near-infrared spectroscopy. One-hour post-L-citrulline supplementation, exhaled NO• was significantly increased (19.2%; p < 0.05), and this increase was preserved until the end of the resistive breathing (16.4%; p <0.05). In contrast, no difference was observed in the placebo condition. Pulmonary function and MIP were not affected by the L-citrulline supplementation. During resistive breathing, sternocleidomastoid muscle oxygenation was significantly reduced, with no difference noted between the two supplementation conditions. In conclusion, a single ingestion of 6 g L-citrulline increased NO• bioavailability but not the respiratory performance and inspiratory muscle oxygenation. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Συγγραφείς:
Theodorou, A.A.
Zinelis, P.T.
Malliou, V.J.
Chatzinikolaou, P.N.
Margaritelis, N.V.
Mandalidis, D.
Geladas, N.D.
Paschalis, V.
Περιοδικό:
Nutrient Cycling in Agroecosystems
Λέξεις-κλειδιά:
citrulline; nitric oxide; placebo; citrulline; deoxyhemoglobin; hemoglobin; nitric oxide; oxygen; oxyhemoglobin, adult; Article; bioavailability; breathing; breathing muscle; controlled study; crossover procedure; double blind procedure; forced expiratory volume; forced vital capacity; fractional exhaled nitric oxide; human; lung function; male; maximal inspiratory pressure; near infrared spectroscopy; normal human; oxygenation; sternocleidomastoid muscle; task performance; vitamin supplementation; clinical trial; dietary supplement; drug effect; exhalation; metabolism; muscle; vital capacity, Biological Availability; Citrulline; Dietary Supplements; Exhalation; Forced Expiratory Volume; Hemoglobins; Humans; Male; Muscles; Nitric Oxide; Oxygen; Oxyhemoglobins; Respiration; Vital Capacity
