Abstract
ices of athletes play a crucial role in shaping their body composition, influencing sports performance, training adaptations, and overall health. However, despite the widely acknowledged significance of dietary intake in athletic success, there exists a gap in our understanding of the intricate relationships between nutrition, body composition, and performance. Furthermore, emerging evidence suggests that many athletes fail to adopt optimal nutritional practices, which can impede their potential achievements. In response, this Special Issue seeks to gather research papers that delve into athletes’ dietary practices and their potential impacts on body composition and sports performance. Additionally, studies focusing on interventions aimed at optimizing dietary habits are encouraged. This paper outlines the key aspects and points that will
fail to adopt optimal nutritional practices, which can impede their potential achievements. In response, this Special Issue seeks to gather research papers that delve into athletes’ dietary practices and their potential impacts on body composition and sports performance. Additionally, studies focusing on interventions aimed at optimizing dietary habits are encouraged. This paper outlines the key aspects and points that will be developed in the ensuing articles of this Special Issue. Keywords:athletes; dietary practices; body composition; sports performance; nutrition interventions; training adaptations; optimal nutrition; athletic success 1. Introduction The realm of sports performance represents a dynamic interplay of various factors, among which dietary practices and body composition stand as pivotal elements [1]. In this line, the importance of nutrition in sports is well established, with a growing body of research underscoring its role in enhancing athletic performance, improving recovery, and reducing the risk of injury and illness [2]. However, the one-size-fits-all approach is rapidly becoming obsolete, as individualized nutrition strategies tailored to specific sports, physiological demands, and personal health and fitness goals gain prominence [3]. Body composition, an athlete’s proportion of fat, muscle, and bone, is another critical factor in sports performance [4]. The relationship between body composition and perfor- mance is complex and sport specific [5]. For instance, while leaner body composition may benefit endurance athletes, sports requiring explosive power or strength may necessitate a higher muscle mass [6]. This Special Issue aims to dissect these relationships, providing insights into how athletes can optimize their body composition for their specific sporting de- mands. Furthermore, this Special Issue addresses the nutritional requirements for different Nutrients2024,16, 571.
Nutrients2024,16, 571 2 of 32 sports. The energy and nutrient needs of an athlete vary significantly across different sports disciplines. Endurance sports, such as long-distance running, have different nutritional demands compared to strength-based sports like weightlifting [2]. Understanding these differences is crucial for developing effective dietary strategies that support the unique needs of each athlete. Evaluating the current dietary practices of athletes is a multifaceted endeavor that extends beyond mere observation of food intake. It involves a deep dive into the intricacies of athletes’ nutritional habits, encompassing the identification of common deficiencies or excesses that could impact performance [7]. This comprehensive evaluation is crucial, as it lays the groundwork for developing more effective and personalized nutritional strategies. By understanding the real-world dietary patterns of athletes, including their specific nu- tritional gaps and excesses, sports nutritionists and dietitians can tailor interventions that address these unique needs [8]. This approach is not only about enhancing performance but also about ensuring the overall health and well-being of the athlete. The complexity of this task is compounded by the diverse range of sports, each with its specific nutritional demands, making the role of individualized dietary assessment and planning even more critical [9]. The factors influencing nutritional choices among athletes are as diverse as the sports themselves. Personal preferences, cultural backgrounds, and the accessibility of certain foods play significant roles in shaping an athlete’s diet [10]. Moreover, an athlete’s knowledge about nutrition, or lack thereof, can greatly influence their food choices. This Special Issue delves into these varied influences, providing a comprehensive overview of how factors like cultural dietary norms, availability of food resources, personal taste preferences, and nutritional education impact an athlete’s dietary decisions. Additionally, the goals of the athlete, whether they are health-related or performance-oriented, also steer their nutritional choices. Understanding these multifarious factors is essential for developing effective nutritional strategies that are not only scientifically sound but also culturally sensitive and personally appealing to athletes. Nutrition’s role in training adaptations is a topic of paramount importance. The appropriate balance of macronutrients (carbohydrates, proteins, and fats) and micronu- trients (vitamins and minerals) is
or performance-oriented, also steer their nutritional choices. Understanding these multifarious factors is essential for developing effective nutritional strategies that are not only scientifically sound but also culturally sensitive and personally appealing to athletes. Nutrition’s role in training adaptations is a topic of paramount importance. The appropriate balance of macronutrients (carbohydrates, proteins, and fats) and micronu- trients (vitamins and minerals) is crucial for optimizing athletic performance [11]. This balance influences various aspects of an athlete’s training, from enhancing endurance and strength to promoting efficient muscle recovery and growth [11]. The latest research in sports nutrition provides insights into how different dietary components can be optimized to support specific training adaptations [12]. For instance, the role of carbohydrates in energy provision and the importance of protein in muscle repair and growth are well documented [13]. Additionally, this Special Issue explores how micronutrients and hy- dration strategies contribute to reducing fatigue and enhancing overall training efficiency. This comprehensive examination of nutrition’s role in training adaptations underscores its significance in an athlete’s overall training regime. Optimal nutrition for recovery is another critical aspect covered in this Special Issue. Recovery is not just a passive process of rest but an active phase where nutrition plays a key role. The right nutritional strategies during the recovery phase can significantly enhance the repair and rebuilding of muscle tissues and replenish glycogen stores [14]. This section of this Special Issue delves into the roles of various nutrients, such as proteins for muscle repair, carbohydrates for glycogen replenishment, and electrolytes for fluid balance, in the recovery process. Understanding these nutritional needs is crucial for developing effective recovery strategies that help athletes return to training and competition more quickly and effectively [14]. The impact of dietary practices on an athlete’s long-term health is a topic that extends beyond the realm of performance enhancement [15]. The long-term health implications of an athlete’s diet are profound, with potential effects on cardiovascular health, bone density, immune function, and overall well-being [16]. This Special Issue explores the complex relationship between nutrition, health, and sports performance, emphasizing the importance of a balanced diet not just
long-term health is a topic that extends beyond the realm of performance enhancement [15]. The long-term health implications of an athlete’s diet are profound, with potential effects on cardiovascular health, bone density, immune function, and overall well-being [16]. This Special Issue explores the complex relationship between nutrition, health, and sports performance, emphasizing the importance of a balanced diet not just for short-term gains in performance but also for long-term health and quality of life. Interventions to improve dietary practices among
Nutrients2024,16, 571 3 of 32 athletes are essential for optimizing both performance and health outcomes. This Special Issue discusses various strategies to enhance athletes’ dietary habits, including educational programs to increase nutritional knowledge, personalized nutrition planning to cater to individual needs, and the use of technology for monitoring and improving dietary habits. These interventions are designed to empower athletes with the knowledge and tools they need to make informed dietary choices that support their performance and health goals. Then, this narrative review offers a comprehensive exploration of the complex inter- play between dietary practices, body composition, and sports performance (Figure). It provides a blend of theoretical insights, practical strategies, and future perspectives, aiming to inform and inspire athletes, coaches, nutritionists, and researchers in the field of sports nutrition. This Special Issue underscores the multifaceted nature of sports nutrition, high- lighting its critical role in enhancing athletic performance, supporting training adaptations, aiding recovery, and promoting long-term health.Nutrients 2024, 16, x FOR PEER REVIEW 4 of 34 Figure 1. Graphical abstract of this comprehensive exploration of the complex interplay between dietary practices, body composition, and sports performance. 2. Body Composition and Performance Relationships Understanding the relationship between body composition and performance across various sports disciplines is a complex yet crucial aspect of sports science. In aerobic sports such as long-distance running and cycling, a leaner body composition is often advanta- geous for efficiency and endurance. Knechtle, Wirth, and Knechtle (2010) found a signifi- cant correlation between lower body fat percentage and higher performance in endurance runners, emphasizing the importance of lean mass in endurance-based activities [17]. Sim- ilarly, Legaz and Eston (2005) demonstrated that triathletes with lower body fat percent- ages exhibited better race times, particularly in running segments [18]. In the context of long-distance running, the role of body composition extends beyond mere fat percentage. A study by Beattie, Kenny, Lyons, and Carson (2014) explored the impact of skeletal mus- cle mass on endurance performance [19]. They found that higher skeletal muscle mass, particularly in the lower body, was associated with improved running efficiency and per- formance. [19] This suggests that
context of long-distance running, the role of body composition extends beyond mere fat percentage. A study by Beattie, Kenny, Lyons, and Carson (2014) explored the impact of skeletal mus- cle mass on endurance performance [19]. They found that higher skeletal muscle mass, particularly in the lower body, was associated with improved running efficiency and per- formance. [19] This suggests that while lower body fat is advantageous, maintaining ade- quate muscle mass is also crucial for endurance athletes. Moreover, the distribution of body fat plays a role in endurance sports. A study by Knechtle, Wirth, and Knechtle (2010) Figure 1.Graphical abstract of this comprehensive exploration of the complex interplay between dietary practices, body composition, and sports performance. Thus, we employed a thorough approach to gather pertinent literature, aligning with methodologies used by previous researchers in the field. Our comprehensive search strategy encompassed not only traditional academic databases but also extended to grey literature and consultations with subject matter experts. Key databases such as PubMed, Scopus, Embase, Science Direct, Sports Discuss, ResearchGate, and the Web of Science were utilized, alongside platforms like Google Scholar, to access a wider range of materials, including those not peer reviewed.
Nutrients2024,16, 571 4 of 32 Our literature search was meticulously structured, employing keywords in line with MeSH standards such as “dietary practices”, “body composition”, “sports performance”, “athletic nutrition”, “performance-enhancing diets”, “sports-specific nutrition”, “nutritional deficiencies in athletes”, and “dietary interventions in sports”. This strategy was designed to comprehensively cover publications from 1 December 2013 to 15 December 2023 that are pertinent to the focus of our review. A team of seven seasoned authors was involved in screening the titles and abstracts of all gathered manuscripts. We established inclusion criteria centered on the relevance to the review’s theme, scientific integrity, and alignment with the subject of athletic performance and nutrition. Manuscripts that fell outside our specified timeline, were not in English, or were irrelevant to our focused area of research were excluded. This rigorous selection process was crucial in ensuring that only high- quality and relevant studies were included in our review. The same team was responsible for the critical task of data extraction and synthesis from the chosen studies. Each study was independently reviewed, and its findings were integrated into a coherent narrative. This approach allowed us to offer a comprehensive and systematic overview of the current understanding in the field, presenting a nuanced and in-depth perspective on the complex interplay between dietary practices, body composition, and sports performance, and exploring the implications for athlete health and performance optimization. 2. Body Composition and Performance Relationships Understanding the relationship between body composition and performance across various sports disciplines is a complex yet crucial aspect of sports science. In aerobic sports such as long-distance running and cycling, a leaner body composition is often advantageous for efficiency and endurance. Knechtle, Wirth, and Knechtle (2010) found a significant correlation between lower body fat percentage and higher performance in endurance runners, emphasizing the importance of lean mass in endurance-based activi- ties [17]. Similarly, Legaz and Eston (2005) demonstrated that triathletes with lower body fat percentages exhibited better race times, particularly in running segments [18]. In the context of long-distance running, the role of body composition extends beyond mere fat percentage. A study by Beattie, Kenny, Lyons,
higher performance in endurance runners, emphasizing the importance of lean mass in endurance-based activi- ties [17]. Similarly, Legaz and Eston (2005) demonstrated that triathletes with lower body fat percentages exhibited better race times, particularly in running segments [18]. In the context of long-distance running, the role of body composition extends beyond mere fat percentage. A study by Beattie, Kenny, Lyons, and Carson (2014) explored the impact of skeletal muscle mass on endurance performance [19]. They found that higher skeletal muscle mass, particularly in the lower body, was associated with improved running ef- ficiency and performance. [19] This suggests that while lower body fat is advantageous, maintaining adequate muscle mass is also crucial for endurance athletes. Moreover, the distribution of body fat plays a role in endurance sports. A study by Knechtle, Wirth, and Knechtle (2010) also noted that not just the quantity, but the distribution of adipose tissue, impacts endurance performance [17]. Athletes with lower central body fat—or fat stored around the abdomen—tended to perform better in endurance events, indicating the importance of body fat distribution in addition to overall body fat percentage [17]. In cycling, where both endurance and power are essential, body composition signifi- cantly influences performance. A study by Menaspà, Quod, Martin, Peiffer, and Abbiss (2015) highlighted that a lower body fat percentage and higher lean body mass were in- dicative of higher power output in cyclists [20]. This underscores the need for a balanced approach to body composition, where lean mass must be optimized alongside minimizing excess body fat. Furthermore, the role of body composition in swimming, another aerobic sport, has been explored by Sharp et al. (2017), who found that swimmers with lower body fat percentages and higher lean body mass ratios exhibited better performance [21]. This aligns with the general trend in aerobic sports where efficiency, buoyancy, and power are enhanced by optimal body composition. These studies collectively emphasize that in aerobic sports, the goal of achieving a leaner body composition must be balanced with maintaining sufficient muscle mass. This balance is crucial not only for performance en- hancement but also for injury prevention
[21]. This aligns with the general trend in aerobic sports where efficiency, buoyancy, and power are enhanced by optimal body composition. These studies collectively emphasize that in aerobic sports, the goal of achieving a leaner body composition must be balanced with maintaining sufficient muscle mass. This balance is crucial not only for performance en- hancement but also for injury prevention and long-term athlete health. The challenge for athletes and their support teams lies in crafting training and nutritional strategies that
Nutrients2024,16, 571 5 of 32 support the development of an optimal body composition tailored to the specific demands of their sport. In anaerobic sports, where quick, explosive movements are essential, the importance of muscle mass and power cannot be overstated. This is particularly evident in sports like sprinting, where every millisecond counts, and high-intensity interval training, where short bursts of maximum effort are required. The relationship between muscle mass and sprint performance has been extensively studied. On this line, a research study by Seitz, Reyes, Tran, Saez de Villarreal, and Haff (2014) found that increases in lower body strength were significantly correlated with improvements in sprint performance [22]. This study underscores the importance of developing lower body strength for athletes involved in sprinting and similar high-intensity, short-duration sports. Moreover, the type of muscle fibers plays a crucial role in anaerobic performance. Fast-twitch muscle fibers, known for their quick response and high-power output, are more prevalent in successful sprinters. A study by Egan and Zierath (2013) highlighted the significance of these muscle fibers in anaerobic activities [23]. They noted that athletes with a higher proportion of fast-twitch fibers tend to perform better in sports requiring short, intense bursts of energy [23]. In addition to muscle mass and fiber type, muscle power is a critical component of anaerobic performance. A study byMero, Komi, and Gregor (1992) demonstrated that muscle power, particularly during the initial phase of sprinting, signifi- cantly influences overall sprint performance [24]. This finding suggests that training aimed at increasing explosive power can be beneficial for athletes in anaerobic sports. Furthermore, the role of body composition in high-intensity interval training (HIIT) has been explored in recent research. A study by Boutcher (2011) found that HIIT can lead to significant reductions in body fat, particularly visceral fat, while improving muscle power and endurance [25]. This indicates that HIIT not only benefits athletes in terms of performance but also positively impacts body composition. These studies collectively highlight the multifaceted nature of body composition in anaerobic sports. While a higher muscle mass is beneficial, the type of muscle fibers and the ability to
in body fat, particularly visceral fat, while improving muscle power and endurance [25]. This indicates that HIIT not only benefits athletes in terms of performance but also positively impacts body composition. These studies collectively highlight the multifaceted nature of body composition in anaerobic sports. While a higher muscle mass is beneficial, the type of muscle fibers and the ability to generate power quickly are equally important. Training programs for athletes in these sports need to focus not just on increasing muscle size but also on enhancing muscle quality and power output. This approach ensures that athletes can perform at their peak during the high-intensity demands of their sports. In sports demanding explosive strength, the composition and quality of muscle tissue are paramount. A study by Comfort et al. (2012) demonstrated that in power athletes, muscle hypertrophy, particularly in fast-twitch muscle fibers, is strongly correlated with enhanced performance [26]. These fibers are known for their rapid force generation, making them crucial in activities requiring sudden, intense bursts of power. Similarly, Stone et al. (2003)found that muscle strength, particularly in the lower body, is a key pre- dictor of sprint performance, highlighting the importance of muscle mass and strength in sports requiring quick, powerful movements [27]. Furthermore, the role of body composi- tion in explosive strength and power extends beyond muscle characteristics. Fat mass, or the lack thereof, also plays a significant role. A lower body fat percentage can contribute to a higher power-to-weight ratio, which is crucial in sports where body weight must be propelled or moved rapidly. This was illustrated in a study by Zaras et al. (2013), which found that lower body fat percentages were associated with improved performance in weightlifting and jumping tasks [28]. 3. Nutritional Requirements for Different Sports In contemporary sports, an athlete’s preparation for competition is incomplete without a diet tailored to their specific training needs. A diet providing adequate caloric intake, inclusive of proteins, carbohydrates, and both micro and macronutrients, must align with the unique demands of each sport. Factors such as the athlete’s position on the field, the duration and type of sport,
Description
This paper explores the relationship between dietary practices, body composition, and sports performance.