大学運動選手における習慣的な早朝練習が主観的睡眠感、睡眠時身体活動および気分状態に及ぼす影響

抄録

　The purpose of this study was to examine the influence of habitual early morning practice on sleep states and mood states in student athletes. Six male canoe sprinters (CS), most of whom start practice before 6:00 a.m. (age: 20.9 ± 0.6 years, height: 171.5 ± 2.3 cm, weight: 73.0 ± 5.8 kg, BMI: 24.8 ± 1.6), and 6 male baseball players (BB), most of whom start practice after 7:00 a.m. (age: 21.1 ± 0.4 years, height: 173.3 ± 6.4 cm, weight: 74.3 ± 3.9 kg, BMI: 24.8 ± 1.4) participated. Their subjective sleep states were evaluated using the Pittsburgh Sleep Quality Index (PSQI-J) and Oguri-Shirakawa-Azumi (OSA) sleep inventory score. Activity during sleep was objectively recorded with an actigraph (MTN-220) attached to the waist, and total sleep time (TST), sleep latency (SL), number of awakenings (NOA), sleep efficiency (SE), number of posture changes (NPC), wake-time (WT) and bedtime (BT) were analyzed. Mood states were assessed using the Profile of Mood States 2nd edition (POMS2-A) questionnaire: Anger–hostility (AH), Confusion–bewilderment (CB), Depression-dejection (DD), Fatigue-inertia (FI), Tension-anxiety (TA), Vigor-activity (VA), Friendliness (F) and Total mood disturbance (TMD). CS scored lower than BB, except for sleep duration, on the PSQI-J, and in all components of the OSA, and significantly lower for sleepiness and sleep maintenance. As for activity during sleep, CS had significantly longer TIB and TST. CS had lower scores for all negative components and VA among the positive components of POMS2-A, and significant differences were observed for CB, DD, TA and TMD. The relationship between PSQI-J and POMS2-A, and PSQI global score was significantly and positively correlated with CB. These results suggest that early morning practice is one factor having an undesirable influence on subjective sleep state and mood states in student athletes. However, as the relationship between sleep and mood state was not clear, there is a need to considers this from various viewpoints related to sleep.