La Cryothérapie pour les particuliers

Parasympathetic Activity and Blood Catecholamine
Responses Following a Single Partial-Body
Cryostimulation and a Whole-Body Cryostimulation

by Christophe Hausswirth, Karine Schaal, Yann Le Meur, François Bieuzen, Jean-Robert Filliard,
Marielle Volondat, Julien Louis

The aim of this study was to compare the effects of a single whole-body cryostimulation (WBC) and a partial-body
cryostimulation (PBC) (i.e., not exposing the head to cold) on indices of parasympathetic activity and blood
catecholamines. Two groups of 15 participants were assigned either to a 3-min WBC or PBC session, while 10
participants constituted a control group (CON) not receiving any cryostimulation. Changes in thermal, physiological
and subjective variables were recorded before and during the 20-min after each cryostimulation. According to a
qualitative statistical analysis, an almost certain decrease in skin temperature was reported for all body regions
immediately after the WBC (mean decrease±90% CL, -13.7±0.7°C) and PBC (-8.3±0.3°C), which persisted up to 20-
min after the session. The tympanic temperature almost certainly decreased only after the WBC session
(-0.32±0.04°C). Systolic and diastolic blood pressures were very likely increased after the WBC session, whereas
these changes were trivial in the other groups. In addition, heart rate almost certainly decreased after PBC (-10.9%)
and WBC (-15.2%) sessions, in a likely greater proportion for WBC compared to PBC. Resting vagal-related heart
rate variability indices (the root-mean square difference of successive normal R-R intervals, RMSSD, and high
frequency band, HF) were very likely increased after PBC (RMSSD: +54.4%, HF: +138%) and WBC (RMSSD:
+85.2%, HF: +632%) sessions without any marked difference between groups. Plasma norepinephrine
concentrations were likely to very likely increased after PBC (+57.4%) and WBC (+76.2%), respectively. Finally, cold
and comfort sensations were almost certainly altered after WBC and PBC, sensation of discomfort being likely more
pronounced after WBC than PBC. Both acute cryostimulation techniques effectively stimulated the autonomic
nervous system (ANS), with a predominance of parasympathetic tone activation. The results of this study also
suggest that a whole-body cold exposure induced a larger stimulation of the ANS compared to partial-body cold