The Validity of an Updated Metabolic Power Algorithm Based upon di Prampero’s Theoretical Model in Elite Soccer Players

Cristian Savoia, Johnny Padulo, Roberto Colli, Emanuele Marra, Allistair McRobert, Neil Chester, Vito Azzone, Samuel A. Pullinger and Dominic A. Doran
Additional contact information
Cristian Savoia: Research Institute for Sport and Exercise Sciences (RISES), Tom Reilly Building, Liverpool John Moores University, Liverpool L2 2ER, UK
Johnny Padulo: Department of Biomedical Sciences for Health, Università degli Studi di Milano, 20122 Milan, Italy
Roberto Colli: Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, 67100 L’Aquila, Italy
Emanuele Marra: School of Sport Sciences and Exercise, Faculty of Medicine and Surgery, Tor Vergata University, 00133 Rome, Italy
Allistair McRobert: Research Institute for Sport and Exercise Sciences (RISES), Tom Reilly Building, Liverpool John Moores University, Liverpool L2 2ER, UK
Neil Chester: Research Institute for Sport and Exercise Sciences (RISES), Tom Reilly Building, Liverpool John Moores University, Liverpool L2 2ER, UK
Vito Azzone: Federazione Italiana Giuoco Calcio (F.I.G.C.), 00198 Rome, Italy
Samuel A. Pullinger: Research Institute for Sport and Exercise Sciences (RISES), Tom Reilly Building, Liverpool John Moores University, Liverpool L2 2ER, UK
Dominic A. Doran: Research Institute for Sport and Exercise Sciences (RISES), Tom Reilly Building, Liverpool John Moores University, Liverpool L2 2ER, UK

IJERPH, 2020, vol. 17, issue 24, 1-20

Abstract: The aim of this study was to update the metabolic power (MP) algorithm ( P V ? O 2 , W·kg ?1 ) related to the kinematics data (P GPS , W·kg ?1 ) in a soccer-specific performance model. For this aim, seventeen professional (Serie A) male soccer players ( V ? O 2 max 55.7 ± 3.4 mL·min ?1 ·kg ?1 ) performed a 6 min run at 10.29 km·h ?1 to determine linear-running energy cost (C r ). On a separate day, thirteen also performed an 8 min soccer-specific intermittent exercise protocol. For both procedures, a portable Cosmed K4b 2 gas-analyzer and GPS (10 Hz) was used to assess the energy cost above resting (C). From this aim, the MP was estimated through a newly derived C equation (P GPSn ) and compared with both the commonly used (P GPSo ) equation and direct measurement ( P V ? O 2 ). Both P GPSn and P GPSo correlated with P V ? O 2 (r = 0.66, p < 0.05). Estimates of fixed bias were negligible (P GPSn = ?0.80 W·kg ?1 and P GPSo = ?1.59 W·kg ?1 ), and the bounds of the 95% CIs show that they were not statistically significant from 0. Proportional bias estimates were negligible (absolute differences from one being 0.03 W·kg ?1 for P GPSn and 0.01 W·kg ?1 for P GPSo ) and not statistically significant as both 95% CIs span 1. All variables were distributed around the line of unity and resulted in an under- or overestimation of P GPSn , while P GPSo routinely underestimated MP across ranges. Repeated-measures ANOVA showed differences over MP conditions ( F 1,38 = 16.929 and p < 0.001). Following Bonferroni post hoc test significant differences regarding the MP between P GPSo and P V ? O 2 /P GPSn ( p < 0.001) were established, while no differences were found between P V ? O 2 and P GPSn ( p = 0.853). The new approach showed it can help the coaches and the soccer trainers to better monitor external training load during the training seasons.

Keywords: energy cost; soccer-specific circuit; global position system; intermittent exercise; portable gas analyzer (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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