目的：探討業餘保齡球投手不同投球風格的上肢運動學與肌肉活動模式，描述各投球風格的特異性運動學與神經肌肉需求。方法：27名男性業餘投手 (平均年齡31.2 ± 7.2歲，身高170.2 ± 4.7公分，體重70.9 ± 8.7公斤)，依慣用投球風格分為直球組 (n = 9)、曲球組 (n = 9) 及飛碟球組 (n = 9)。使用資料記錄器與攝影機量測腕、肘關節角度及四組肌肉活化：肱二頭肌 (BB)、肱三頭肌 (TB)、腕屈肌 (FCU) 與腕伸肌 (ECR)。肌電圖資料以最大自主等長收縮 (MVIC) 標準化，每位投手16投球數據取平均。組間差異以ANCOVA分析，球重為共變數，統計顯著水準訂為 α = .05。結果：飛碟球組後擺期腕伸展 (p < .001) 與橈側偏移角速度 (p < .001) 最高，前擺期腕屈曲 (p < .05) 及偏移 (p < .05) 角速度峰對峰變化率亦最大。曲球組後擺期FCU活化較高 (p = .018)，飛碟球組出手期FCU較低、ECR較高，FCU/ECR比值下降 (p = .005 – .012)，BB與TB無差異。結論：腕、肘運動學與肌電圖模式隨投球風格而異。飛碟球組角速度及峰對峰變化最大，直球組角度範圍較小。腕部肌電呈現投球風格特異的 FCU/ECR肌肉活化模式。

Purpose: To investigate upper-extremity kinematics and muscle activation patterns in amateur tenpin bowlers with different throwing styles, and to characterize the style-specific kinematic and neuromuscular demands. Methods: Twenty-seven male amateur bowlers (age 31.2 ± 7.2 yr; height 170.2 ± 4.7 cm; mass 70.9 ± 8.7 kg) were divided into straight (n = 9), hook (n = 9), and spin (n = 9) groups. Wrist and elbow range of motion (ROM) angles and four muscles (biceps brachii, BB; triceps brachii, TB; wrist flexor, FCU; and extensor, ECR) were recorded using a data logger and camcorder. EMG data were normalized to maximal voluntary isometric contraction (MVIC), and per-participant averages of 16 throws were calculated. Group differences were examined using ANCOVA with ball mass as a covariate. The significance level was set at α = 0.05. Results: Spin bowlers had the highest maximal wrist extension (p < .001) and radial deviation angular velocity (p < .001) during backswing, and the largest peak-to-peak wrist flexion (p < .05) and deviation (p < .05) angular velocity changes during forward swing than other styles. Hook bowlers showed higher FCU during backswing (p = .018), while spin bowlers had lower FCU, higher ECR, and a lower FCU/ECR ratio near release (p = .005–.012); BB and TB showed no differences. Conclusions: Wrist and elbow kinematics and EMG patterns differed in bowling style. Spin bowlers exhibited higher angular velocities and peak-to-peak changes, while straight bowlers had smaller ROM angles during follow-through. Wrist EMG showed style-specific FCU/ECR activation patterns.