Partial-body cryostimulation does not impact peripheral microvascular responsiveness but reduces muscular metabolic O2 consumption (m V ˙ O2) at rest - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Cryobiology Année : 2023

Partial-body cryostimulation does not impact peripheral microvascular responsiveness but reduces muscular metabolic O2 consumption (m V ˙ O2) at rest

Résumé

This study aimed to investigate the effect of partial-body cryostimulation (PBC) on microvascular responsiveness and muscular metabolic O2 consumption rate (mO2). Twenty healthy young adults (ten males and ten females) underwent a post-occlusive reactive hyperemia (PORH) test at the flexor digitorum superficialis area before and after a 3-min PBC session and a 3-min control session. Using near-infrared spectroscopy, occlusion and reperfusion slopes were calculated: oxyhemoglobin ([HbO2]) decrease rate ([HbO2] slope 1), deoxyhaemoglobin ([HHb]) increase rate ([HHb] slope 1), [HbO2] increase rate ([HbO2] slope 2), and [HHb] increase rate ([HHb] slope 2. Using HbO2 kinetics during the occlusion, mO2 was also calculated to characterize myocytes’ metabolic O2 consumption. HbO2 slope 1 value was lower after PBC than before PBC (−0.15 ± 0.08 vs −0.24 ± 0.11 s−1; respectively; P < 0.05) in male participants only. A lower [HHb] slope 1 was also observed after PBC compared to before PBC (0.18 ± 0.10 vs 0.24 ± 0.16 s−1; P < 0.05) with no interaction for sex categories. mO2 was significantly lower after PBC than before (pre values 14.75 ± 3.94 vs 18.47 ± 5.73 μMO2Hb.s−1; respectively; P < 0.01) with no interaction between sex categories. No changes in the calculated slope 2 were observed. These findings suggest that a single session of PBC reduces the muscular metabolic O2 needs at rest; however, it does not alter the vascular ability to provide O2 to the myocytes.
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hal-04246147 , version 1 (21-03-2024)

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Dimitri Theurot, Olivier Dupuy, Julien Louis, Wafa Douzi, Renée Morin, et al.. Partial-body cryostimulation does not impact peripheral microvascular responsiveness but reduces muscular metabolic O2 consumption (m V ˙ O2) at rest. Cryobiology, 2023, 112, pp.104561. ⟨10.1016/j.cryobiol.2023.104561⟩. ⟨hal-04246147⟩
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