# Profile of Accelerations and Decelerations in Young Basketball Players
## 3 Results
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Variables** & **1 st Quarter** & **2 nd Quarter** & **3 rd Quarter** & **4 th Quarter** \\ \hline
**Low ACC (0-1 m-s\({}^{-2}\))** & & & & \\ \hline Max ACC (m-s\({}^{-2}\)) & 0.72 (0.52) & 0.68 (0.51) & 0.69 (0.52) & 0.67 (0.51) \\ Distance (m) & 1.53 (2.04) & 1.42 (1.97) & 1.47 (2.02) & 1.35 (1.90) \\ Start speed (km-h\({}^{-1}\)) & 2.10 (2.56) & 1.93 (2.46) & 1.96 (2.43) & 1.86 (2.35) \\ Final speed (km-h\({}^{-1}\)) & 4.68 (3.38) & 4.38 (3.27) & 4.47 (3.26) & 4.24 (3.15) \\ \hline
**Moderate ACC (2-4 m-s\({}^{-2}\))** & & & & \\ \hline Max ACC (m-s\({}^{-2}\)) & 2.62 (0.48) & 2.63 (0.48) & 2.61 (0.47) & 2.61 (0.47) \\ Distance (m) & 4.80 (3.46) & 4.82 (3.43) & 4.65 (3.43) & 4.51 (3.28) \\ Start speed (km-h\({}^{-1}\)) & 2.27 (1.92) & 2.21 (1.88) & 2.24 (1.93) & 2.18 (1.85) \\ Final speed (km-h\({}^{-1}\)) & 12.30 (4.34) & 12.32 (4.32) & 12.11 (4.30) & 11.93 (4.20) \\ \hline
**High ACC (0-4 m-s\({}^{-2}\))** & & & & \\ \hline Max ACC (m-s\({}^{-2}\)) & 4.57 (0.69) & 4.55 (0.61) & 4.63 (0.69) & 4.56 (0.69) \\ Distance (m) & 5.53 (3.49) c\({}^{,d}\) & 5.35 (3.18) & 4.76 (2.99) & 4.80 (2.82) \\ Start speed (km-h\({}^{-1}\)) & 3.30 (2.74) & 3.36 (2.39) & 3.22 (2.77) & 3.14 (2.73) \\ Final speed (km-h\({}^{-1}\)) & 17.01 (4.92) c\({}^{,d}\) & 16.84 (5.21) & 15.85 (4.79) & 15.55 (5.23) \\ \hline
**Low DEC (0-1 m-s\({}^{-2}\))** & & & & \\ \hline Max DEC (m-s\({}^{-2}\)) & 0.72 (0.51) & 0.69 (0.51) & 0.70 (0.51) & 0.68 (0.50) \\ Distance (m) & 1.69 (2.43) & 1.58 (2.38) & 1.60 (2.37) & 1.51 (2.30) \\ Start speed (km-h\({}^{-1}\)) & 4.81 (3.56) & 4.53 (3.47) & 4.58 (3.42) & 4.37 (3.33) \\ Final speed (km-h\({}^{-1}\)) & 2.08 (2.54) & 1.92 (2.43) & 1.95 (2.41) & 1.84 (2.32) \\ \hline
**Moderate DEC (2-4 m-s\({}^{-2}\))** & & & & \\ \hline Max DEC (m-s\({}^{-2}\)) & 2.63 (0.49) & 2.63 (0.48) & 2.63 (0.49) & 2.62 (0.48) \\ Distance (m) & 4.22 (3.30) & 4.28 (3.30) & 4.13 (3.27) & 4.00 (3.20) \\ Start speed (km-h\({}^{-1}\)) & 11.92 (4.43) & 12.02 (4.42) & 11.79 (4.30) & 11.55 (4.25) \\ Final speed (km-h\({}^{-1}\)) & 2.27 (1.79) & 2.24 (1.82) & 2.18 (1.75) & 2.17 (1.71) \\ \hline
**High DEC (0-4 m-s\({}^{-2}\))** & & & & \\ \hline Max DEC (m-s\({}^{-2}\)) & 4.63 (0.71) & 4.60 (0.71) & 4.60 (0.64) & 4.61 (0.66) \\ Distance (m) & 4.97 (2.70) & 4.94 (3.02) & 4.74 (2.65) & 4.70 (2.58) \\ Start speed (km-h\({}^{-1}\)) & 17.38 (4.88) & 16.84 (5.33) & 16.74 (4.75) & 16.79 (4.96) \\ Final speed (km-h\({}^{-1}\)) & 2.57 (1.50) & 2.75 (1.46) & 2.75 (1.80) & 2.55 (1.57) \\ \hline \hline \end{tabular} ACC = acceleration; DEC = deceleration; c = significant and practical different from 3 rd quarter (\(p\leq 0.05\); \(ES>0.20\)); d = significant and practical different from 4 th quarter (\(p\leq 0.05\); \(ES\geq 0.20\)).  
\end{table} 
Table 1: Comparison of acceleration and deceleration profiles during competitive basketball matches by quarter (mean and \(\pm\)sd). The ACC and DEC demands of basketball players during competitive matches by playing position are displayed in Table 2. Statistical and practical differences were found for distance covered (\(F_{(2,854)}=3.20\); \(p=0.041\); \(ES>0.2\)), start speed (\(F_{(2,854)}=4.11\); \(p=0.017\); \(ES>0.2\)), and final speed (\(F_{(2,854)}=3.42\); \(p=0.033\); \(ES>0.2\)) in high ACC actions between playing positions. Specifically, Centers covered lesser distances than Guards (\(p=0.043\); \(ES=0.25\)) and Forwards (\(p=0.044\); \(ES=0.25\)), achieved lower start speeds than Guards (\(p=0.040\); \(ES=0.27\)) and Forwards (\(p=0.015\); \(ES=0.33\)), and achieved lower final speeds than Guards (\(p=0.030\); \(ES=0.28\)) and Forwards (\(p=0.049\); \(ES=0.20\)). No practical significance (\(ES>0.2\)) was found for other ACC and DEC variables between playing positions. The ACC and DEC demands of basketball players by playing position and match quarter are displayed in Table 3. Statistical differences were found for high ACC demands in all playing positions across basketball match quarters (\(p<0.05\); \(ES>0.20\)).