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The effects of whole body cryotherapy (WBC) on measures of respiratory function, and their interaction with sex and anthropometry, are unknown. This study investigated ventilatory responses after WBC and examined the role of sex and anthropometric characteristics in 22 recreationally active male and female participants. Thermal sensation [TS], heart rate, blood pressure and ventilatory measures (expired volume [V˙E], oxygen consumption [V˙O], respiratory exchange ratio and metabolic equivalents of task [METS]) were evaluated pre- and post-WBC, compared to a control condition. V˙E increased by 10.8 L.min following WBC compared to 0.1 L.min in the control session (p=.001). V˙O increased by 0.4 L.min following WBC compared to 0.0 L.min in the control session (p<.001). METS increased by 1.0 following WBC compared to 0.1 in the control session (p<.001). TS decreased by 2 following WBC compared to 0 in the control session (p<.001), with females' TS decreasing significantly more than males following WBC (p=.001). Following a WBC exposure, highly significant strong negative relationships were observed between fat mass index and ΔV˙O (p=.002, r=-.718), body fat percentage and ΔV˙O (p=.003, r=-.700), fat mass index and ΔMETS (p=.001, r=-.729), body fat percentage and ΔMETS (p=.004, r=-.676). Furthermore, strong, statistically significant positive correlations were observed following a WBC exposure between BSA to mass ratio and TS (p=.005, r=-.669), TS and BSA (p<0.001, r=.776) and fat free mass index and TS (p=.001, r=.745). A short exposure to WBC elicits a ventilatory response via increased V˙O, V˙E and METS. The largest increases occur within the first minute post-exposure, but return to near resting levels 1 min post-WBC. Increases in V˙O, V˙E and METS observed post-WBC are likely due to an acute transient shivering response due to cold air exposure.
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http://dx.doi.org/10.1016/j.jtherbio.2020.102633 | DOI Listing |
J Pediatr
March 2025
Division of Neonatology, Departments of Pediatrics, Miller School of Medicine.
Objective: To evaluate the association between intermittent hypoxemia (IH) and hyperoxemia (HOX) during the first 28 days with peripheral and central chemoreception at 36 weeks postmenstrual age among infants born extremely preterm.
Study Design: For this observational study 52 infants born at 23 to 28 weeks of gestational age were enrolled. Mean daily IH frequency (SpO<80% for ≥10s) and percent of time in HOX (SpO≥98% while FiO>.
J Neurol Sci
March 2025
National Hospital for Neurology and Neurosurgery, Queen Square, London, UK.
Anti-IgLON5 is a rare condition with a diverse clinical spectrum. Mortality is high with patients developing respiratory compromise secondary to central hypoventilation or upper airway obstruction. Patients often progress to requiring ventilatory support and tracheostomy.
View Article and Find Full Text PDFAdv Sci (Weinh)
March 2025
Department of Neurobiology, Hebei Medical University, Shijiazhuang, 050017, China.
The dynamic interaction between central respiratory chemoreceptors and the respiratory central pattern generator constitutes a critical homeostatic axis for stabilizing breathing rhythm and pattern, yet its circuit-level organization remains poorly characterized. Here, the functional connectivity between two key medullary hubs: the nucleus tractus solitarius (NTS) and the preBötzinger complex (preBötC) are systematically investigated. These findings delineate a medullary network primarily comprising Phox2b-expressing NTS neurons (NTS), GABAergic NTS neurons (NTS), and somatostatin (SST)-expressing preBötC neurons (preBötC).
View Article and Find Full Text PDFCrit Care
March 2025
Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
Background: Acute respiratory distress syndrome (ARDS) is a heterogeneous condition with varying response to prone positioning. We aimed to identify subphenotypes of ARDS patients undergoing prone positioning using machine learning and assess their association with mortality and response to prone positioning.
Methods: In this retrospective observational study, we enrolled 353 mechanically ventilated ARDS patients who underwent at least one prone positioning cycle.
Chest
March 2025
Research Institute of the McGill University Health Centre, Translational Research in Respiratory Diseases Program and Respiratory Epidemiology and Clinical Research Unit, Montréal, QC, Canada; Clinical Exercise and Respiratory Physiology Laboratory, Department of Kinesiology and Physical Education, Faculty of Education, McGill University, Montréal, QC, Canada.
Background: Exertional breathlessness is a cardinal symptom of people with chronic airflow limitation (CAL) and can be evaluated using cardiopulmonary exercise testing (CPET).
Research Question: Does abnormally high exertional breathlessness in relation to the rate of oxygen uptake (V'O) and minute ventilation (V') indicate different underlying pathophysiological mechanisms and clinical characteristics in people with CAL?
Study Design And Methods: Analysis of people aged ≥40 years with CAL (post-bronchodilator FEV/FVC
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