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At least 19 recordsLinked to original sources
PubMed1977

[On the biophysical interpretation of ageing-factors (author's transl)].

The ageing-factor is a measure for the rate of ageing. In the model of vitality the error rate mu corresponds to the ageing-factor. The ageing-factors of several physical functions can be determined from the ascent of decrease of these functions. The standardized ageing-factors of the considered physiological functions range from 0.001 to 0.017 year--1 and are smaller than the ageing-factor of the whole organism. The date of the occurrence of pathological manifestations as a result of ageing-conditioned decrease of functions can be estimated by means of the ageing-factors.

Adolescent↗
PubMed1977

The age factor in human extraction wound healing.

Age as a factor in extraction wound healing was studied. The healing time in individuals in the second decade of life was compared to that in individuals in the sixth decade and older. In the first ten-day postextraction period, no significant differences in the rate of healing between young and older individuals was noted. At approximately ten days, the rate of regeneration of the tissues of younger individuals began to accelerate. At approximately 20 days, after a lag phase, the rate of regeneration of tissues of older individuals began to accelerate. At approximately 30 days, the rates of healing were equal between young and older individuals. These findings of the period of most active regeneration of reparative marrow tissue in younger and older individuals may have significance in the timing of donor material in marrow transplant procedures. This aspect is currently under investigation.

Adolescent↗
PubMed2026

Association between oxidative balance score and cardiovascular risk factors, aging, and incidence of dementia risk score: A prospective cohort study.

BackgroundOxidative stress is a key contributor to the pathogenesis of Alzheimer's disease and other dementias. The oxidative balance score (OBS), which reflects combined dietary and lifestyle exposure to pro-oxidant and antioxidant factors, serves as an integrated measure of oxidative stress burden.ObjectiveTo investigate the association between OBS and predicted late-life dementia risk using the Cardiovascular Risk Factors, Aging, and Incidence of Dementia (CAIDE) score.MethodsWe analyzed data from 5088 participants aged 40-69 years without dementia at baseline from the Korean Genome and Epidemiology Study. Participants were categorized by OBS tertiles. Cox proportional hazards regression was used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for developing a high risk of late-life dementia, defined by a CAIDE score &#x2265;8. Longitudinal changes in CAIDE scores were assessed using linear mixed-effects models.ResultsDuring a mean follow-up of 12.8 years, 1468 participants (28.9%) progressed to CAIDE-predicted high risk for late-life dementia. Compared with the lowest OBS tertile (T1), participants in the highest tertile (T3) had a significantly lower risk for developing high-risk late-life dementia (HR 0.74, 95% CI 0.65-0.84) and exhibited the lowest CAIDE scores (p&#x2009;<&#x2009;0.001). Each one-point increase in the OBS was associated with a 3% reduction in CAIDE-predicted dementia risk.ConclusionsA higher OBS was significantly associated with a lower predicted risk of late-life dementia. These findings suggest that maintaining an antioxidant-rich diet and a healthy lifestyle during midlife may be effective strategies for dementia prevention.

Alzheimer's disease↗
PubMed1979

Age factors in patient-therapist relationship.

This paper reports on the effects of therapist and patient age as factors in the evaluation and treatment of adult psychiatric outpatients. Therapist ratings and patient self-ratings are contrasted in three age groups. Rating scales include symptomatology, motivation, insight, and prognosis. In addition, a chart review follow-up of 68 patients includes disposition and drop-out. The data suggest that older patients are perceived as sicker, but less treatable than younger patients or patients of the same age group as the therapist. Residents express a strong preference for treating younger patients, but more readily develop a treatment relationship with same age patients. Both older and younger patients were significantly less likely to remain in treatment. Age of therapist and patient as a significant, frequent unrecognized factor in psychotherapeutic intervention is discussed and modifications in psychiatric training programs are suggested.

Adjustment Disorders↗
PubMed1979

The age factor in blood flow in the calf and in vascular resistance at rest and in reactive hyperaemia.

The blood flow and vascular resistance in the calf were studied in two groups of healthy subjects (mean ages 22 and 49 years) at rest and in reactive hyperaemia produced by five minutes' ischaemia of the lower limb. The blood flow was determined by venous occlusive plethysmography and vascular resistance was computed from the mean blood pressure measured by auscultation on the arm and from the blood flow in the calf, at rest and during reactive hyperaemia. The resting flow and blood flows throughout practically the whole time of hyperaemia were found to be significantly smaller in young individuals. The maximal flow was significantly lower, the maximal flow time was significantly prolonged in young subjects. The recovery time and repayment of the flow debt in the two groups were the same. Vascular resistance in the calf was significantly greater in young subjects, both at rest and during dilatation. We assume from the results that the capacity of the arterial system in the lower limbs is significantly smaller in young individuals.

Adolescent↗
PubMed2025

Brain aging rejuvenation factors in adults with genetic and sporadic neurodegenerative disease.

The largest risk factor for dementia is age. Heterochronic blood exchange studies have uncovered age-related blood factors that demonstrate 'pro-aging' or 'pro-youthful' effects on the mouse brain. The clinical relevance and combined effects of these factors for humans is unclear. We examined five previously identified brain rejuvenation factors in cerebrospinal fluid of adults with autosomal dominant forms of frontotemporal dementia and sporadic Alzheimer's disease. Our frontotemporal dementia cohort included 100 observationally followed adults carrying autosomal dominant frontotemporal dementia mutations (Mage = 49.6; 50% female; 43% C9orf72, 24% GRN, 33% MAPT) and 62 non-carriers (Mage = 52.6; 45% female) with cerebrospinal fluid analysed on Somascan, and longitudinal (Mvisits = 3 years, range 1-7 years) neuropsychological and functional assessments and plasma neurofilament light chain. Our Alzheimer's disease cohort included 35 adults with sporadic Alzheimer's disease (Mage = 69.4; 60% female) and 56 controls (Mage = 68.8, 50% female) who completed the same cerebrospinal fluid and clinical outcome measures cross-sectionally. Levels of C-C motif chemokine ligand 11, C-C motif chemokine ligand 2, beta-2-micorglobulin, bone gamma-carboxyglutamate protein (aka Osteocalcin) and colony stimulating factor 2 in cerebrospinal fluid were linearly combined into a composite score, with higher values reflecting 'pro-youthful' levels. In genetic frontotemporal dementia, higher baseline cerebrospinal fluid rejuvenation proteins predicted slower decline across cognitive, functional, and neurofilament light chain trajectories; estimates were similar across genotypes. In transdiagnostic analyses, higher cerebrospinal fluid rejuvenation proteins associated with better functional, cognitive, and neurofilament light chain outcomes in adults with sporadic Alzheimer's disease. Proteins with pre-clinical evidence for brain rejuvenation show translational clinical relevance in adults with Alzheimer's disease and related dementias and warrant further investigation.

Alzheimer&#x2019;s disease↗
PubMed1976

[Aging--risk factor for arteriosclerosis].

The changes of the arteries appearing diffusely caused by ageing as a rule favour the development of the focal arteriosclerotic changes. Already due to the increasing blood lipid level the ageing vessel is exposed to increased loads. It is more difficult for it to cope with them, since caused by ageing the cell functions of endothelium, intima and adjacent media decrease, whereas the diffundibility increases. The alterations of the mucopolysaccharide spectre in old age also render difficult the maintenance of the integrity of the arterial wall. The decrease of the distensibility of the arterial wall, partly consequence of increasing cross-linking, partly expression of senile fibrosis, is partially compensated by dilatation of the vascular tube. When arteriosclerotic beds supervene on account of solidification caused by old age additional difficulties appear. On principle the genuine changes caused by old age smooth the way for the development of arteriosclerotic changes.

Age Factors↗
PubMed1977

Serum cholinesterase (pseudocholinesterase) in Down's syndrome: 1. Phenotype frequencies at the E1 and E2 loci.

Dibucaine, fluoride and RO2-0683 inhibition studies were used to determine the serum cholinesterase (pseudocholinesterase) phenotypes at the E1 locus in a sample of 130 subject with Down's syndrome and fifty-three mentally retarded control subjects. No example of the Ef1 and Es1 allele was detected in either group, nor were any of the genotype E1a E1a detected. The gene frequency of E1a for the control group (0.0189) resembles closely that reported in the literature for normal European populations but in the Down's group was significantly lower (0.0038). The means and distribution of the dibucaine, fluoride and RO numbers in both groups were similar to those reported in normal subjects. The presence of the additional C5 cholinesterase type heterozygous for a variant cholinesterase on the E2 locus) was detected after starch gel electrophoresis, and the frequency was found to be raised in both groups. Several possible environmental factors (age, sex, maternal age, etc.) were investigated to account for this finding but with no success.

Adult↗