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サッカーのスモールサイドゲームにおけるフィールドサイズの違いが生理学的負荷・外的負荷に及ぼす影響：面積と縦横比に着目して [Received November 8, 2024; Accepted December 18, 2025] The purpose of this study was to examine the effects of field area and field length on physiological and external loads in small-sided games (SSGs). For SSGs, (1) Small Short field (30 × 40 m), (2) Small Long field (40 × 15 m), (3) Large Short field (40 × 26.6 m), and (4) Large Long field (50 × 21.28 m) were used. Eight adult male soccer players (age, 21 ± 1 years; height, 172.5 ± 5.7 cm; weight, 65.9 ± 4.4 kg) were equipped with a heart rate monitor and a GPS device to measure the total distance covered during SSGs; the distance covered in each of the four speed ranges; and the %Sprint. Vmax (individually measured in a prior 60 m sprint test), defined as the peak sprint speed during the SSG relative to the maximum sprint speed. The total distance and running speed increased with field area and length. However, beyond a certain field length, no significant differences in the distance covered or %Sprint Vmax were observed. The results of this study suggested that both the field area and field length affected the distance covered and running speed. However, the data suggested that a certain field size might represent a threshold for the increase in running speed with increasing field length and area per player. Keywords: フットボール，スプリント，ゴール型球技，トレーニング |