Browsing by Author "Jodra, Pablo"
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Item Acute beetroot juice supplementation does not improve match-play activity in professional tennis players.(Journal of the American College of Nutrition, 2020) Fernández-Elias, Valentín E.; Courel-Ibañez, Javier; Pérez-Lopez, Alberto; Jodra, Pablo; Moreno-Pérez, Victor; Del Coso, Juan; López Samanés, ÁlvaroBeetroot juice is a source of dietary nitrate (NO3-) recognised as a potential ergogenic aid to enhance tolerance during endurance exercise of submaximal-to-maximal intensity. However, little is known about the effects of beetroot juice on exercise performance in intermittent sports such as tennis. The present study aimed to determine the effect of acute beetroot juice supplementation on movement patterns during a competitive tennis match in professional players. In a double-blind and randomised experiment, nine professional tennis players performed two experimental trials 3 h after ingesting either 70 mL of a commercially-available concentrated beetroot juice (6.4 mmol NO3-) or placebo (0.005 mmol NO3-). In each experimental trial, players completed a 3-set tennis match and two performance tests (i.e., serve speed and isometric handgrip strength) before and after the match. Match-play running performance was recorded using wearable GPS and accelerometer units. In comparison to the placebo trial, the acute beetroot juice supplementation did not modify any match-play running performance (p= 0.178 to 0.997, d = 0.01 to 0.42). Furthermore, beetroot juice supplementation did not alter the pre-topost match change in serve speed (p = 0.663, ηp2 = 0.03) or isometric handgrip strength (p = 0.219, ηp2 = 0.18). The current results indicated that acute ingestion of a commercialised shot of nitrate-rich beetroot juice (70 mL containing 6.4 mmol of NO3-) did not produce any performance benefit on tennis match play. Thus, acute beetroot juice supplementation seems an ergogenic aid with little value to enhance physical performance in professional tennis players.Item Caffeine Supplementation Improves Anaerobic Performance and Neuromuscular Efficiency and Fatigue in Olympic-Level Boxers.(Nutrients, 2019) San Juan, Alejandro F.; López Samanés, Álvaro; Jodra, Pablo; Valenzuela, Pedro L.; Rueda, Javier; Veiga Herreros, Pablo; Pérez López, Alberto; Domínguez, RaúlBackground: this study examined the effects of caffeine supplementation on anaerobic performance, neuromuscular efficiency and upper and lower extremities fatigue in Olympic-level boxers. Methods: Eight male athletes, members of the Spanish National Olympic Team, were enrolled in the study. In a randomized double-blind, placebo-controlled, counterbalanced, crossover design, the athletes completed 2 test sessions after the intake of caffeine (6 mg kg) or placebo. Sessions involved initial measures of lactate, handgrip and countermovement jump (CMJ) performance, followed by a 30-seconds Wingate test, and then final measures of the previous variables. During the sessions, electromiography (EMG) data were recorded on the gluteus maximus, biceps femoris, vastus lateralis, gastrocnemius lateral head and tibialis anterior. Results: caffeine enhanced peak power (6.27%, p < 0.01; E ect Size (ES) = 1.26), mean power (5.21%; p < 0.01; ES = 1.29) and reduced the time needed to reach peak power (9.91%, p < 0.01; ES = 0.58) in theWingate test, improved jump height in the CMJ (+2.4 cm, p < 0.01), and improved neuromuscular e ciency at peak power in the vastus lateralis (ES = 1.01) and gluteus maximus (ES = 0.89), and mean power in the vastus lateralis (ES = 0.95) and tibialis anterior (ES = 0.83). Conclusions: in these Olympic-level boxers, caffeine supplementation improved anaerobic performance without a ecting EMG activity and fatigue levels in the lower limbs. Further benefits observed were enhanced neuromuscular e ciency in some muscles and improved reaction speed.Item Influence of Beetroot Juice Ingestion on Neuromuscular Performance on Semi-Professional Female Rugby Players: A Randomized, Double-Blind, Placebo-Controlled Study.(Foods, 2022) López Samanés, Álvaro; Ramos-Álvarez, Juan José; Tobal, Francisco Miguel; Gaos, Sofía; Jodra, Pablo; Arranz-Muñoz, Raquel; Domínguez, Raúl; Montoya, Juan JoséPurpose: Beetroot juice (BRJ) is considered an ergogenic aid with good to strong evidence for improving human performance in sport modalities with similar demands to rugby. However, most of the studies were realized in male athletes with limited evidence in female athletes. Thus, the aim of this study was to explore the acute ingestion of BRJ in female rugby players. Methods: Fourteen semi-professional female rugby players (25.0 3.7 years) belonging to a team from the First Spanish Female Rugby Division participated in this study. Participants were randomly divided into two groups that realized a neuromuscular battery after BRJ (140mL, 12.8 mmol NO3 �����) or placebo (PLAC, 140 mL, 0.08 mmol NO3 �����) ingestion on two different days separated by one week between protocols. The neuromuscular test battery consisted of a countermovement jump (CMJ), isometric handgrip strength (i.e., dominant), 10-m and 30-m sprint, agility t-test and Bronco test. Afterwards, participants reported a rate of perception scale (6–20 points) and side effects questionnaire associated with BRJ or PLAC ingestion. Results: Statistically significant improvements were observed in CMJ (7.7%; p = 0.029; ES = 0.62), while no differences were reported in dominant isometric handgrip strength (�����1.7%; p = 0.274; ES = �����0.20); 10-m and 30-m sprint (0.5–0.8%; p = 0.441–0.588; ES = 0.03–0.18); modified agility t-test (�����0.6%; p = 0.503; ES = �����0.12) and Bronco test (1.94%; p = 0.459; ES = 0.16). Conclusions: BRJ ingestion could improve neuromuscular performance in the CMJ test, while no differences in sprint (10-m and 30-m sprint test), agility, isometric handgrip strength and endurance performance (i.e., Bronco test) were reported