CrossFit^® is a high-intensity functional training method consisting of daily workouts called “workouts of the day.” No nutritional recommendations exist for CrossFit^® that are supported by scientific evidence regarding the energetic demands of this type of activity or dietary and supplement interventions. This systematic review performed in accordance with PRISMA guidelines aimed to identify studies that determined (a) the physiological and metabolic demands of CrossFit^® and (b) the effects of nutritional strategies on CrossFit^® performance to guide nutritional recommendations for optimal recovery, adaptations, and performance for CrossFit^® athletes and direct future research in this emerging area. Three databases were searched for studies that investigated physiological responses to CrossFit^® and dietary or supplementation interventions on CrossFit^® performance. Various physiological measures revealed the intense nature of all CrossFit^® workouts of the day, reflected in substantial muscle fatigue and damage. Dietary and supplementation studies provided an unclear insight into effective strategies to improve performance and enhance adaptations and recovery due to methodological shortcomings across studies. This systematic review showed that CrossFit^® is a high-intensity sport with fairly homogenous anaerobic and aerobic characteristics, resulting in substantial metabolic stress, leading to metabolite accumulation (e.g., lactate and hydrogen ions) and increased markers of muscle damage and muscle fatigue. Limited interventional data exist on dietary and supplementation strategies to optimize CrossFit^® performance, and most are moderate to very low quality with some critical methodological limitations, precluding solid conclusions on their efficacy. High-quality work is needed to confirm the ideal dietary and supplemental strategies for optimal performance and recovery for CrossFit^® athletes and is an exciting avenue for further research.

CrossFit ^®是一种高强度的功能性训练方法，由称为“每日锻炼”的日常锻炼组成。CrossFit ^®不存在有科学证据支持的有关此类活动或饮食和补充剂干预的能量需求的营养建议。本系统评价按照 PRISMA 指南进行，旨在确定确定 (a) CrossFit ^®的生理和代谢需求和 (b) 营养策略对 CrossFit ^®表现的影响的研究，以指导营养建议以实现最佳恢复、适应和CrossFit ^{® 的}性能运动员和指导这个新兴领域的未来研究。在三个数据库中搜索了研究对 CrossFit ^{® 的}生理反应以及饮食或补充剂干预对 CrossFit ^®表现的影响。各种生理指标揭示了当天所有 CrossFit ^®锻炼的强度，反映在严重的肌肉疲劳和损伤上。由于研究中的方法学缺陷，饮食和补充剂研究对提高表现和增强适应和恢复的有效策略提供了不清楚的见解。该系统评价表明 CrossFit ^®是一项高强度运动，具有相当均匀的无氧和有氧特征，会导致大量代谢压力，导致代谢物积累（例如乳酸和氢离子）并增加肌肉损伤和肌肉疲劳的标志物。关于优化 CrossFit ^®性能的膳食和补充剂策略的干预性数据有限，大多数质量为中等至极低质量，存在一些关键的方法学限制，无法就其功效得出可靠的结论。需要高质量的工作来确定理想的饮食和补充策略，以实现 CrossFit ^®运动员的最佳表现和恢复，并且是进一步研究的令人兴奋的途径。