Maamer Slimani1, Hela Znazen2, Amri Hammami3, Nicola L Bragazzi4,5. 1. "Sport Performance Optimization" Research Laboratory, National Center of Medicine and Science in Sport (CNMSS), El Menzah, Tunisia - maamer2011@hotmail.fr. 2. "Sport Performance Optimization" Research Laboratory, National Center of Medicine and Science in Sport (CNMSS), El Menzah, Tunisia. 3. Laboratory of Physiology, Faculty of Medicine Sousse, Sousse, Tunisia. 4. Department of Health Sciences (DISSAL), School of Public Health, University of Genoa, Genoa, Italy. 5. Section of Psychiatry, Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), Genoa University, Genoa, Italy.
Abstract
BACKGROUND: The aim of the present meta-analysis was to compare the body fat percentage (%) between male soccer players of different competitive levels, playing positions and age groups. EVIDENCE ACQUISITION: The systematic search was conducted using different databases and according to the Population/Intervention or Exposure/Comparison/Outcome(s) [PICO] criteria. EVIDENCE SYNTHESIS: Higher percentage values of body fat in lower-level soccer players than higher-level counterparts (ES=0.18, 95% CI -0.86 to -0.14, P=0.006) were noted. Higher body fat % values in goalkeepers than defenders (ES=0.21, 95% CI -1.17 to -0.34, P<0.001), midfielders (ES=0.26, 95% CI -1.50 to -0.45, P<0.001) and forwards (ES=0.18, 95% CI -1.26 to -0.53, P<0.001) were observed. There was no significant association between % of body fat and age (P=0.86). CONCLUSIONS: In conclusion, body fat percentage clearly distinguished higher- from lower-level soccer players. These findings also imply that body fat percentage differ as a function of positional role in soccer and that sports scientists, coaches, and strength and conditioning professionals need to be aware of the specific positional requirements in soccer in terms of body fat. However, due to some limitations of the present meta-analysis (high statistically significant heterogeneity and evidence of publication bias), further studies are urgently needed in the field.
BACKGROUND: The aim of the present meta-analysis was to compare the body fat percentage (%) between male soccer players of different competitive levels, playing positions and age groups. EVIDENCE ACQUISITION: The systematic search was conducted using different databases and according to the Population/Intervention or Exposure/Comparison/Outcome(s) [PICO] criteria. EVIDENCE SYNTHESIS: Higher percentage values of body fat in lower-level soccer players than higher-level counterparts (ES=0.18, 95% CI -0.86 to -0.14, P=0.006) were noted. Higher body fat % values in goalkeepers than defenders (ES=0.21, 95% CI -1.17 to -0.34, P<0.001), midfielders (ES=0.26, 95% CI -1.50 to -0.45, P<0.001) and forwards (ES=0.18, 95% CI -1.26 to -0.53, P<0.001) were observed. There was no significant association between % of body fat and age (P=0.86). CONCLUSIONS: In conclusion, body fat percentage clearly distinguished higher- from lower-level soccer players. These findings also imply that body fat percentage differ as a function of positional role in soccer and that sports scientists, coaches, and strength and conditioning professionals need to be aware of the specific positional requirements in soccer in terms of body fat. However, due to some limitations of the present meta-analysis (high statistically significant heterogeneity and evidence of publication bias), further studies are urgently needed in the field.
Authors: Jorge López-Fernández; Jorge García-Unanue; Javier Sánchez-Sánchez; Enrique Colino; Enrique Hernando; Leonor Gallardo Journal: Int J Environ Res Public Health Date: 2020-05-02 Impact factor: 3.390