§1Ὅτι ὑπὸ καταψύξεώς φησιν, ὡς κοινῷ λόγῳ φάναι τὴν παράλυσιν γίνεσθαι· καὶ ταύτην οἱ μὲν ὑπὸ πνεύματος (καταψυχομένου), — πνευματικὸν γὰρ τὸ πάθος, — οἱ δὲ ἐκλείψει καὶ στερήσει τοῦ πνεύματος.
That he says, to speak in general terms, that paralysis occurs due to cooling; and that some say this occurs due to (cooled) pneuma — for the affection is pneumatic — while others say it is due to the failure and deprivation of pneuma.
Τοῦτο γὰρ εἶναι τὸ τὴν θερμότητα καὶ τὴν κίηησιν ὅλως ποιοῦν· ἀκινησίας δὲ γινομένης κατάψυξις γίνεται τοῦ αἵματος ἢ ἁπλῶς εἰπεῖν τῆς ὑγρότητος.
For this is what entirely produces heat and movement; and when immobility occurs, cooling of the blood, or simply speaking, of the moisture, takes place.
Διὰ τοῦτο γὰρ καὶ ἡ νάρκη γίνεται ἐν τοῖς ποσὶν ἢ καὶ ἐν τοῖς ἄνω μέρεσιν ὅταν ἀποπιεσθῶσιν ἀπὸ καθέδρας ἢ ἄλλῳ τινὶ τρόπῳ.
For this is also why numbness occurs in the feet or even in the upper parts when they are compressed from sitting or in some other way.
Τότε γὰρ διαλαμβάνει τῇ πιέσει τὸ πνεῦμα καὶ οὐ δυνάμενον τὴν οἰκείαν κίνησιν κινεῖσθαι ἵστησι καὶ ἀποψύχει τὸ αἷμα.
For then [the compression] intercepts the pneuma by the pressure, and [the pneuma], being unable to move its proper movement, stops and cools the blood.