Browsing by Author "Siahkouhian, Marefat"
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- Comparison of measurements of external load between professional soccer playersPublication . Gholizadeh, Roghayyeh; Nobari, Hadi; Bolboli, Lotfali; Siahkouhian, Marefat; Brito, JoãoBackground: The excessive and rapid increases in training load (TL) may be responsible for most non-contact injuries in soccer. This study’s aims were to describe, week(w)-by-week, the acute (AW), chronic (CW), acute:chronic workload ratio (wACWR), total distance (wTD), duration training (wDT), sprint total distance (wSTD), repeat sprint (wRS), and maximum speed (wMS) between starter and non-starter professional soccer players based on different periods (i.e., pre-, early-, mid-, and end-season) of a full-season (Persian Gulf Pro League, 2019–2020). Methods: Nineteen players were divided according to their starting status: starters (n = 10) or non-starters (n = 9). External workload was monitored for 43 weeks: pre- from w1–w4; early- from w5–w17; mid- from w18–w30, and end-season from w31–w43. Results: In starters, AW, CW, and wACWR were greater than non-starters (p < 0.05) throughout the periods of early- (CW, p≤0.0001), mid- (AW, p = 0.008; CW, p ≤ 0.0001; wACWR, p = 0.043), or end-season (AW, p = 0.035; CW, p = 0.017; wACWR, p=0.010). Starters had a greater wTD (p ≤ 0.0001), wSTD (p≤0.0001 to 0.003), wDT (p≤0.0001 to 0.023), wRS (p ≤ 0.0001 to 0.018), and wMS (p ≤ 0.0001) than non-starters during early-, mid-, and end-season. Conclusion: Starters experienced more CW and AW during the season than non-starters, which underlines the need to design tailored training programs accounting for the differences between playing status.
- Variations of accelerometer and metabolic power global positioning system variables across a soccer season: a within-group study for starters and non-startersPublication . Nobari, Hadi; Oliveira, Rafael; Siahkouhian, Marefat; Pérez-Gómez, Jorge; Cazan, Florin; Ardigò, Luca PaoloThe aims of this study were to analyze the within‐group weekly metabolic power average (wMPA), weekly acceleration zones (wAcZ), and weekly deceleration zones (wDcZ), in starter and non‐starter professional soccer players, based on different periods of the full season (pre‐, early‐, mid‐, and end‐season). Twenty‐one professional soccer players (age, 28.3 ± 3.8 years; height, 181.2 ± 7.1 cm; body mass, 74.5 ± 7.7 kg; BMI, 22.6 ± 1.0 kg∙m2) were monitored during the full season in the highest level of the Iranian Premier League. WMPA, wAcZ, and wDcZ at three different zones (wAcZ1, wAcZ2, wAcZ3, wDcZ1, wDcZ2, wDcZ3) were collected using Global Positioning System. ANOVA was applied to analyze within‐group changes across the different periods of the full season. In general, starters presented higher values in the beginning of the season (pre‐ and early‐season) and lower values at mid‐ and end‐season. Specifically, starters showed significant differences in early‐ vs. mid‐season for wMPA, wAcZ1, and wDcZ1 (p < 0.05), plus early‐ vs. end‐season for wMPA and wAcZ1 (p < 0.01). In addition, non‐starters showed higher values in the pre‐season that decreased until the end‐season for wMPA, wAcZ1, and wDcZ1. Regarding wAcZ2, wDcZ2, wAcZ3, and wDcZ3, non‐starters presented higher values in early‐season that decreased until the end‐season. Specifically, non‐starters showed significant differences in pre‐ vs. mid‐season for wMPA, wAcZ1, and wDcZ1; pre‐ vs. end‐season for wMPA, wDcZ1, wDccZ2, and wDcZ3; early‐ vs. midseason for wMPA, wAcZ1, wDcZ1, wAcZ2, and wDccZ2; early‐ vs. end‐season for wMPA, wAcZ1, wDcZ1, wAcZ2 wDccZ2, wAcZ3, and wDcZ3; and mid‐ vs. end‐season for wMPA, wAcZ1, and wAcZ3 (p < 0.05). In conclusion, starters were revealed to have higher values in pre‐ and earlyseason, and lower values in mid‐ to end‐season, while non‐starters were revealed to have lower load values in pre‐ and end‐season and higher load values in early‐ and mid‐season. This study provides extra insights over the season for starters and non‐starters, respectively. Data can be used by coaches to better training periodization across soccer season.