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PURPOSE: Whole-body cryotherapy (WBC) is an already proven method of supportive therapy in somatic medicine. Emerging evidence suggests that WBC might exert beneficial effects on lipid profile; however, studies in this field have provided mixed findings. OBJECTIVE: We aimed to perform a systematic review and meta-analysis of studies investigating the impact of WBC on lipid profile. METHODS: Electronic databases (the MEDLINE, the ERIC, the CINAHL Complete, the International Pharmaceutical Abstracts as well as the Academic Search Ultimate and the Health Source: Nursing/Academic Edition) were searched from their inception until 25th April 2020. Meta-analysis was performed using random-effects models and Hedges g' was calculated as the effect size estimate. RESULTS: We identified seven eligible studies. Pooled data analysis revealed significantly lower levels of triglycerides after WBC. Sensitivity analysis also demonstrated significantly lower levels of total cholesterol and low-density lipoproteins (LDL) after removing single studies. Meta-regression analysis showed that lower baseline body mass index (BMI) was significantly associated with greater changes in the levels of total cholesterol and LDL during WBC. CONCLUSIONS: Our findings imply that WBC may exert beneficial effects on the lipid profile in terms of lowering the levels of total cholesterol, LDL and triglycerides. Lower BMI may predict a greater improvement of lipid profile during WBC. However, caution should be taken as to the way our results are being interpreted due to low number of studies and considerable methodological heterogeneity of studies included in our meta-analysis.
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Crioterapia/métodos , Lípidos/sangre , HumanosRESUMEN
BACKGROUND: The positive effect of human cystatin C on the development of Alzheimer's disease has been reported, as it inhibits the formation of ß-amyloid oligomers and amyloidogenesis. Cystatin C has been found to have a neuroprotective effect by inhibiting cysteine proteases, inducing autophagy and neurogenesis. There is a growing interest in the procognitive properties of colostrum-based specimens, which could delay dementia and ameliorate memory deterioration. OBJECTIVES: The aim of the study was to evaluate the influence of ovocystatin and a Coloco peptide complex on the cognitive functions in reference to Colostrinin, using a model of young (4 month-old) and old (10-month-old) Wistar rats. MATERIAL AND METHODS: In the present study, the effects of ovocystatin [100 µg/rat] and the Coloco peptide [4 µg/rat]derived from colostrum were assessed with respect to the reference specimen, Colostrinin [4 µg/rat]. The specimens were administered intraperitoneally and orally for 12 days. Cognitive functions were assessed using the Morris water maze (MWM). RESULTS: The group of young rats that received ovocystatin orally obtained significantly better results in the MWM compared to the placebo group (p < 0.05). Similarly, the group of young rats receiving Coloco orally obtained better results in the MWM compared to the placebo group and to the group of rats receiving Colostrinin (p < 0.05). There were no statistically significant differences in the oral and intraperitoneal administration of ovocystatin, Coloco and Colostrinin in the group of old rats. CONCLUSIONS: The obtained results suggest that oral administration of ovocystatin and Coloco has beneficial effects on the cognitive functions of young rats.
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Cognición/efectos de los fármacos , Calostro/química , Inhibidores de Cisteína Proteinasa/farmacología , Factores Inmunológicos/farmacología , Péptidos/farmacología , Animales , Péptidos y Proteínas de Señalización Intercelular , Masculino , Aprendizaje por Laberinto/efectos de los fármacos , Modelos Animales , Actividad Motora/efectos de los fármacos , Ratas , Ratas WistarRESUMEN
The study aimed to assess the effect of the polypeptide Y complex (Yolkin), isolated from chicken egg yolk, on behavioural and cognitive functions. It also aimed to compare this activity with colostrum-derived substances (Colostrinin, Coloco), which have a confirmed impact on learning and memory. In the study, the effect of Yolkin, administered to rats of different ages, who performed various tasks involving spatial and episodic memory, motor functions and exploratory behavior, was assessed. The experiment was carried out in rats which were 6 and 12 months old. Two different doses of the studied specimens based on previous comparative studies and two different routes of administration (oral and retroperitoneal) were used. A series of behavioural tests were carried out, including an open field test, a novel object recognition test and a Morris water maze. They were used to evaluate the impact of the studied specimen on improving locomotor function and exploratory behaviour, preventing their decline and assess the functioning of episodic and spatial memory in aging rats. The administration of Yolkin gave distinct effects compared to colostrum-derived substances, although confirmed its suggested pro-cognitive action. Therefore, it may be used to enhance cognitive functions and inhibit the progression of dementia in the course of neurodegenerative disorders.