随意筋の収縮と弛緩について反応時を指標に検討した。被検者に中学生男女, 成人男女各3名, 計12名を用い四肢について反応時間を計測した。弛緩動作については拮抗筋の収縮なしに主働筋を弛緩する場合と拮抗筋を積極的に収縮させて主働筋を弛緩する場合の二つの反応時を求めた。更に拮抗筋を収縮させないで主働筋を弛緩するトレーニングを行ない, 筋力発揮との関係を検討した。
1.収縮反応時をCR, 拮抗筋を収縮させない弛緩反応時をAR, 拮抗筋を収縮させて弛緩する場合をPRとすると, 上下肢とも男子はCRが最も速く, 次いでPR, ARの順であったが, 女子では一定した傾向を認めなかった。
2.下肢では, 男女とも計測値に顕著な左右差を認めなかった。
3.上肢では, 女子はPRが最も速く, 次いでCR, ARの順であり, 男子のそれとは異なっていた。
4.上肢のARで, 左は各グループとも近似の値を示したが, 右において中学生と成人との間に顕著な差を認めた。
5.上腕三頭筋を上腕二頭筋の積極的な収縮なしに弛緩するトレーニングを連続6日間行なった。トレーニングの結果, ARの短縮が被検者4名中2名に認められた。
6.等尺性に瞬発最大屈腕力を測定し, 張力曲線よりtanθ=P₂-P₁/t₂-t₁, tanφ=P₂-P₁/logt₂/t₁を求めた。弛緩反応時の短縮を認あた2名に, tanθ, tanφともに大きくなる傾向を認めた。

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As an index of bodily adaptation development for muscular exercise two groups of subjects (T-group, trained, and U-group, untrained) were studied under a fixed environmental condition. All the member of T-group responded with quicker rises in the sweat rate, as if their bodies anticipated and took measures against the impending rise of body temperature, and attained early at the individual steady levels, in moderate or low load exercise ; moreover their Cl losses in the sweat were remarkably low, thus effectively keeping the internal environment of the body (this time the ion concentration of the blood) less disturbed. Together with other findings, we infer that physical training sets our body more efficient in dealing with the excessive heat produced by muscular exertion.

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A simple method of evaluation and measurement of endurance of the whole body for exercise prescription for sportsmen was previously reported. In the present study, a method of loading for general population was deviced and is the subject of the present communication.
The site of loading was divided into relatively localized portions of the lower extremity, upper extremity and trunk.
By substituting the kneeling exercise with step test, individual difference in body height was corrected.

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The relations between the power output during exercise and its maximal duration have been investigated on three young male subjects throughout the performance of heavy constant loaded cycling exercises with different intensities, all of which lead to exhaustion during the period from about 20 seconds to about 100 minutes.
The Aerobic Power output (mean total oxygen intake during exercise) develops rapidly with the increase of the maximal duration of exercise amounting to a few minutes in every case, and then, levels off approximately in one case, but declines steadily in the other cases.
The Anaerobic Power output (oxygen debt per endurance time of exercise) decreases rapidly with the increase of the maximal duration of exercise amounting to about 5 minutes, and then decreases slowly.
The relation between the Total Power output (sum of the Aerobic Power output plus the Anaerobic Power output) and its maximal duration is summarized as the two equations : log P = a - b logt, in the case of the t shorter than about 5 minutes, and log P =a′ - b′log t, in the case of the t longer than about 5 minutes. Here, P is the Total Power, tis the maximal duration, and a, b, a′ and b′ are constants. In each subject, the values of the constants a and b respectively. are greater than the a′ and b′
The present investigation was supported by a Grant in Aid for the Miscellaneous Scientific Research from the Ministry of Education.

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21～22才の剣道鍛練女子4名について二・三の検査を行い次のような結論を得た。
1) 握力調節能力は同年令の一般女子に比べ, 剣道鍛練女子は著しくすぐれている。
2) 反応時間は月経期に稍々延長する傾向が観察された。
3) 握力及び握力調節能力は月経周期によっては影響されなかった。
4) 高度な剣道鍛練はその直後でも握力調整能力を低下させることはない。

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