{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T23:41:44Z","timestamp":1790034104377,"version":"4.0.1"},"reference-count":51,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2024,5,9]],"date-time":"2024-05-09T00:00:00Z","timestamp":1715212800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Eckes-Granini Group GmbH"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Background: Various nutritional strategies are increasingly used in sports to reduce oxidative stress and promote recovery. Chokeberry is rich in polyphenols and can reduce oxidative stress. Consequently, chokeberry juices and mixed juices with chokeberry content are increasingly used in sports. However, the data are very limited. Therefore, this study investigates the effects of the short-term supplementation of a red fruit juice drink with chokeberry content or a placebo on muscle damage, oxidative status, and leg strength during a six-day intense endurance protocol. Methods: Eighteen recreational endurance athletes participated in a cross-over high intensity interval training (HIIT) design, receiving either juice or a placebo. Baseline and post-exercise assessments included blood samples, anthropometric data, and leg strength measurements. Results: A significant increase was measured in muscle damage following the endurance protocol in all participants (\u2206 CK juice: 117.12 \u00b1 191.75 U\/L, \u2206 CK placebo: 164.35 \u00b1 267.00 U\/L; p = 0.001, \u03b72 = 0.17). No group effects were detected in exercise-induced muscle damage (p = 0.371, \u03b72 = 0.010) and oxidative status (p = 0.632, \u03b72 = 0.000). The reduction in strength was stronger in the placebo group, but group effects are missing statistical significance (\u2206 e1RM juice: 1.34 \u00b1 9.26 kg, \u2206 e1RM placebo: \u22123.33 \u00b1 11.49 kg; p = 0.988, \u03b72 = 0.000). Conclusion: Although a reduction in strength can be interpreted for the placebo treatment, no statistically significant influence of chokeberry could be determined. It appears that potential effects may only occur with prolonged application and a higher content of polyphenols, but further research is needed to confirm this.<\/jats:p>","DOI":"10.3390\/nu16101428","type":"journal-article","created":{"date-parts":[[2024,5,9]],"date-time":"2024-05-09T10:31:16Z","timestamp":1715250676000},"page":"1428","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["The Influence of a Polyphenol-Rich Red Berry Fruit Juice on Recovery Process and Leg Strength Capacity after Six Days of Intensive Endurance Exercise in Recreational Endurance Athletes"],"prefix":"10.3390","volume":"16","author":[{"given":"Sarah","family":"Valder","sequence":"first","affiliation":[{"name":"Department of Preventive and Rehabilitative Sport Medicine, Institute of Cardiovascular Research and Sport Medicine, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elisabeth","family":"Habersatter","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Sport Medicine, Institute for Cardiovascular Research and Sport Medicine, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7573-9999","authenticated-orcid":false,"given":"Tihomir","family":"Kostov","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Sport Medicine, Institute for Cardiovascular Research and Sport Medicine, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sina","family":"Quenzer","sequence":"additional","affiliation":[{"name":"Eckes-Granini Group GmbH, 55268 Nieder-Olm, Germany"},{"name":"Department of Beverage Research, Chair Analysis and Technology of Plant-Based Foods, Geisenheim University, 65366 Geisenheim, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lukas","family":"Herzig","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Sport Medicine, Institute for Cardiovascular Research and Sport Medicine, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jakob","family":"von Bernuth","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Sport Medicine, Institute for Cardiovascular Research and Sport Medicine, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4777-7066","authenticated-orcid":false,"given":"Lynn","family":"Matits","sequence":"additional","affiliation":[{"name":"Clinical & Biological Psychology, Institute of Psychology and Education, Ulm University, 89081 Ulm, Germany"},{"name":"Division of Sports and Rehabilitation Medicine, Department of Medicine, Ulm University Hospital, 89081 Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Volker","family":"Herdegen","sequence":"additional","affiliation":[{"name":"Eckes-Granini Group GmbH, 55268 Nieder-Olm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Diel","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Sport Medicine, Institute for Cardiovascular Research and Sport Medicine, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eduard","family":"Isenmann","sequence":"additional","affiliation":[{"name":"Department of Molecular and Cellular Sport Medicine, Institute for Cardiovascular Research and Sport Medicine, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,5,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Souissi, W., Bouzid, M.A., Farjallah, M.A., Ben Mahmoud, L., Boudaya, M., Engel, F.A., and Sahnoun, Z. 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