Analysis of Relationship between Training Load and Recovery Status in Adult Soccer Players: a Machine Learning Approach

Abstract Periods of intensified training may increase athletes' fatigue and impair their recovery status. Therefore, understanding internal and external load markers-related to fatigue is crucial to optimize their weekly training loads. The current investigation aimed to adopt machine learning (ML) techniques to understand the impact of training load parameters on the recovery status of athletes. Twenty-six adult soccer players were monitored for six months, during which internal and external load parameters were daily collected. Players' recovery status was assessed through the 10-point total quality recovery (TQR) scale. Then, different ML algorithms were employed to predict players' recovery status in the subsequent training session (S-TQR). The goodness of the models was evaluated through the root mean squared error (RMSE), mean absolute error (MAE), and Pearson's Correlation Coefficient (r). Random forest regression model produced the best performance (RMSE=1.32, MAE=1.04, r = 0.52). TQR, age of players, total decelerations, average speed, and S-RPE recorded in the previous training were recognized by the model as the most relevant features. Thus, ML techniques may help coaches and physical trainers to identify those factors connected to players' recovery status and, consequently, driving them toward a correct management of the weekly training loads

Anaerobic critical velocity of master swimmers

Based on the concept of critical velocity (CV), a new trend has been suggested with the aim to determine anaerobic performances. Using short distances trials, the concept of anaerobic critical velocity (AnCV) seems to represent the functional anaerobic capacity of swimmers. Marinho et al. (2011) found a linear relationship between AnCV and 50 m swimming performance (S50) in young swimmers, suggesting that AnCV could be a relevant parameter to monitor and prescribe anaerobic training sets. The purpose of this study was to analyze the relationship between AnCV and swimming performance in master swimmers. Also, ascertain if AnCV may be determined based in two or three swimming distances, 15, 25 and 50 m (T15, T25 and T50, respectively).info:eu-repo/semantics/publishedVersio

Hydrodynamics of domain growth in nematic liquid crystals

We study the growth of aligned domains in nematic liquid crystals. Results are obtained solving the Beris-Edwards equations of motion using the lattice Boltzmann approach. Spatial anisotropy in the domain growth is shown to be a consequence of the flow induced by the changing order parameter field (backflow). The generalization of the results to the growth of a cylindrical domain, which involves the dynamics of a defect ring, is discussed.Comment: 12 revtex-style pages, including 12 figures; small changes before publicatio

Advances and challenges in understanding the electrocatalytic conversion of carbon dioxide to fuels

Catalysis and Surface Chemistr

First steps on the resistance profiling of Kawisari coffee hybrid through cytological and gene expression analyses

info:eu-repo/semantics/publishedVersio

Optoelectronic Oscillators for Communication Systems

International audienceWe introduce and report recent developments on a novel five port optoelectronic voltage controlled oscillator consisting of a resonant tunneling diode (RTD) optical-waveguide integrated with a laser diode. The RTD-based optoelectronic oscillator (OEO) has both optical and electrical input and output ports, with the fifth port allowing voltage control. The RTD-OEO locks to reference radio-frequency (RF) sources by either optical or electrical injection locking techniques allowing remote synchronization, eliminating the need of impedance matching between traditional RF oscillators. RTD-OEO functions include generation, amplification and distribution of RF carriers, clock recovery, carrier recovery, modulation and demodulation and frequency synthesis. Self-injection locking operation modes, where small portions of the output electrical/optical signals are fed back into the electrical/optical input ports, are also proposed. The self-phase locked loop configuration can give rise to low-noise high-stable oscillations, not limited by the RF source performance and with no need of external optoelectronic conversion