Effects of evening partial body cryostimulation on the skin and core temperatures.

Abstract

Cryostimulation is widely used to treat inflammation, rheumatism, acute soft tissue injuries, and neurodegeneration. It helps prevent injury and promotes recovery. This study aimed to examine the duration of the effects of evening partial body cryostimulation (PBC) on core and skin temperatures. Seven male athletes participated in this study. On the day of PBC, at 18:00, each athlete was exposed to PBC (approx. -180\u202f°C) in a specially designed cabin for 3\u202fmin. On the control day, at 18:00, the participants sat still on a sofa for 10\u202fmin. On both days, bedtime was at around 23:00. Wrist and abdominal skin temperatures, except during PBC, were recorded with Thermochron thermistors after 17:30. Core temperatures were monitored with an ingestible and telemetric core body temperature sensor and a data recorder. The circadian rhythm of the core temperature was observed on both days. The core temperature at 22:30 was found to be lower on the PBC day. Wrist and abdominal skin temperatures recovered after PBC; however, the residual effects on both were different. The abdominal skin temperature at 22:30 was lower on the PBC day. Subjective sleep quality and next morning sleepiness did not differ between the conditions. These results suggested that the effects of a 3-min evening PBC session on the core and skin temperatures lasted for several hours. However, these differences did not affect the subjective sleep quality.