スポーツ選手の心理的キャパシティとしての
心理的ストレス耐性の検討

−血漿抱合型カテコールアミン値の
指標としての有効性の検討−

Evaluation of Tolerance to Mental Stress in Athlete
Using Plasma Sulfoconjugated Catecholamines

by

Atsushi Saito, Tetsuro Ogaki,
Kimio Hashimoto, Shozo Kanaya
Institute of Health Science, Kyushu University

ABSTRACT

Plasma free and sulfoconjugated catecholamines concentration were measured in 19 male athlets ( 11 sprinters, 2 jumpers and 6 alpen skiers ) to quantify the tolerance to cronicmental stress in competition.
There was a negative correlation between the score of Trait Anxiety Inventory for sport (TAIS)
and the basal leves of sulfoconjugated epinephrine (S-E,r=-.274), norepinephrine (S-NE,r=-.329) and dopamine (S-DA,r=-.322). In contrast, there were positive correlation between the score of Diagnostic Inventory of Psycholigical-competitive Ability for Athletes (DIPCA) and the basal levels of S-E(r=.286),S-NE(r=.317) and S-DA(r=.415). These correlations were not significant, but this may indicate a tendency that high score on TAIS indicate negative correlation, while high score on the DIPCA indicate positive correlaton with sulfoconjugated catecholamin (S-CA) concentrations.
Following a 5 minutes mental arithmetic stress test, heart rete was increased during the test and remained increased 30 seconds sfter the test (p＜.01). Plasma free epinephrine concentration was increased following the test, but significantly increase was shown only 3 minutes during the test (p＜．０５）. However, plasma S-DA concentration decreased significantly both during the test and just before the end of stress session (p＜.05). Changes in the other plasma CA concentrations were not observed following the test.
These results may suggest that plasma S-CA could be an indicator of chronic activation of sympatho-adrenal system and therefore a possible measure of the tolerance to mental stress.

　要　旨

　スポーツ選手の心理的競技能力としての心理的ストレス耐性の定量化の指標としての血中抱合型カテコールアミン値の有効性について検討した。血中抱合型カテコールアミン値は一般的な特性不安尺度得点に比し、競技不安尺度得点との間に高い負の相関関係を示し、さらに心理的競技能力得点との間には正の相関を示した。
　また、暗算による心理的ストレス負荷の結果、これまで交感神経系の活性度の指標とされてきた血中遊離カテコールアミン値が負荷中一過性に増加した後低下するのに比し、血中抱合型カテコールアミン値は負荷終了直前においても有意な低値を示した。
　以上の結果は血中抱合型カテコールアミン値は慢性的な交感神経系の活性を示し、心理的ストレス耐性の高い競技者では高値を示し、耐性の低い競技者では低値を示す可能性を示唆した。