AIM: The aim of this paper was to determine changes of the bioelectrical impedance vector (BIVA) throughout a soccer season and to ascertain whether vector changes are associated with endurance performance changes. METHODS: Eighteen professional male soccer players (age=21.8±3.0 years, height=1.8±0.07 m, mass=7.2±6.5 kg) participated in the study. BIVA was conducted serially on 8 occasions throughout one soccer season. Endurance performance (Yo-Yo test) was assessed before the first training session of the preseason training, after the pre-season training and at the end of the season. RESULTS: Vector length shortened (p<0.05) during pre-season training and was associated with improvements in endurance performance (r=0.569, p=0.034). Vector length and phase-angle increased at mid-season compared to post pre-season training (p<0.05). Vector length at end-season was lower compared to mid-season (p<0.05). No further changes in endurance performance occurred. CONCLUSION: Bioimpedance vector variations from baseline indicate that fluid-gains occur during the pre-season training, possibly due to plasma volume expansion and enhanced glycogen storage, accompanied by improvements in endurance performance. The vector migration and the increase in phase angle during the competitive season indicate fluid-loss and an increase in body cell mass without effects on performance. At the very end of the season, when training volume and intensity are reduced, body fluid increases again.
AIM: The aim of this paper was to determine changes of the bioelectrical impedance vector (BIVA) throughout a soccer season and to ascertain whether vector changes are associated with endurance performance changes. METHODS: Eighteen professional male soccer players (age=21.8±3.0 years, height=1.8±0.07 m, mass=7.2±6.5 kg) participated in the study. BIVA was conducted serially on 8 occasions throughout one soccer season. Endurance performance (Yo-Yo test) was assessed before the first training session of the preseason training, after the pre-season training and at the end of the season. RESULTS: Vector length shortened (p<0.05) during pre-season training and was associated with improvements in endurance performance (r=0.569, p=0.034). Vector length and phase-angle increased at mid-season compared to post pre-season training (p<0.05). Vector length at end-season was lower compared to mid-season (p<0.05). No further changes in endurance performance occurred. CONCLUSION: Bioimpedance vector variations from baseline indicate that fluid-gains occur during the pre-season training, possibly due to plasma volume expansion and enhanced glycogen storage, accompanied by improvements in endurance performance. The vector migration and the increase in phase angle during the competitive season indicate fluid-loss and an increase in body cell mass without effects on performance. At the very end of the season, when training volume and intensity are reduced, body fluid increases again.
Authors: Francesco Campa; Catarina Matias; Hannes Gatterer; Stefania Toselli; Josely C Koury; Angela Andreoli; Giovanni Melchiorri; Luis B Sardinha; Analiza M Silva Journal: Int J Environ Res Public Health Date: 2019-12-12 Impact factor: 3.390
Authors: Francesco Campa; Analiza Monica Silva; Vincenzo Iannuzzi; Gabriele Mascherini; Luca Benedetti; Stefania Toselli Journal: Int J Environ Res Public Health Date: 2019-11-26 Impact factor: 3.390
Authors: Stefania Toselli; Elisabetta Marini; Pasqualino Maietta Latessa; Luca Benedetti; Francesco Campa Journal: Int J Environ Res Public Health Date: 2020-01-22 Impact factor: 3.390
Authors: Francesco Campa; Analiza M Silva; Catarina N Matias; Cristina P Monteiro; Antonio Paoli; João Pedro Nunes; Jacopo Talluri; Henry Lukaski; Stefania Toselli Journal: Int J Environ Res Public Health Date: 2020-09-10 Impact factor: 3.390