Due to the spread of coronavirus people throughout the world, many countries, Croatia included, have been forced to impose social distancing resulting in an increased number of people at risk of another public health problem – loneliness. Loneliness can be defined as the presence of negative emotions associated with the perceived social exclusion and is identified as one of the major issues of the aging population. There is a relatively small number of studies either dealing with the use of various communication methods, particularly information and communication technologies, by the elderly during the COVID-19 pandemic or determining potential benefits of such activities. The aim of this research was to determine the difference in self-assessment of social and family loneliness according to the means of communication used by the elderly during the COVID-19 pandemic. The research was conducted in March and April 2020 covering the period from the introduction of the epidemiological measures of social distancing and self-isolation until the relaxation of virus-related restrictions in Croatia. The research included 107 subjects over the age of 65 living in their own homes in the Croatian city of Bjelovar. A Frequency of the Used Communication Methods Questionnaire was constructed for the purpose of this research. The Social and Emotional Loneliness Scale for Adults was used to determine the level of loneliness. The obtained results indicate that lower levels of social and family loneliness were shown by subjects who stated in their self-assessment a higher intensity level of communication during the COVID-19 pandemic, such as making telephone/mobile phone calls, using information technology (computers for video calls, social networks, etc.) and mobile chat applications (Viber, Skype, WhatsApp, etc.), as well as having face-to-face communication. Subjects who rarely or never communicated by using any means of the abovementioned communication showed higher levels of social and family loneliness. Results of this research suggest that using various communication methods, particularly modern communication technologies, have a positive effect on reducing the level of loneliness in the elderly. Teamwork of gerontologists, communication technologists and other experts who work with older population could introduce them to communication technology thus making them more satisfied and improving their quality of life.

Background/Objectives: This study assessed the effects of 5G radiofrequency electromagnetic radiation (RF-EMR) at different frequencies (700 MHz, 2500 MHz, 3500 MHz) on the complete blood count (CBC), erythrocyte morphometry, and platelet activation after the short-term in vitro exposure of human blood. Methods: Blood samples from 30 healthy volunteers (15 men and 15 women, aged 25–40 years old) were collected at three intervals (14 days apart). For each collection, four tubes of blood were drawn per volunteer—two experimental and two controls. Experimental samples were exposed to 5G RF-EMR for 2 h at room temperature using a half-cone gigahertz transverse electromagnetic cell. The CBC was analysed via a haematology analyser, the erythrocyte morphometry was analysed using the SFORM program, and platelet activation was analysed via flow cytometry. Results: The CBC and platelet activation showed no significant differences between the experimental and control samples. However, the erythrocyte morphometry exhibited notable changes. At 700 MHz, the erythrocyte size, contour, and membrane roughness increased significantly for both sexes, with women’s cells showing greater sensitivity. At 2500 MHz, women exhibited an increased contour index and a decreased solidity and form factor. At 3500 MHz, women showed an increased contour index and outline but a decreased solidity, elongation, and form factor. Cluster analysis identified two erythrocyte subpopulations: smaller, rounder cells with smooth membranes and larger cells with rougher membranes. Conclusions: These results indicate that 5G RF-EMR exposure significantly alters erythrocyte morphometry. The strongest effects were observed at 700 MHz, where men exhibited greater membrane roughness, and women showed larger and rounder erythrocytes. These findings suggest that short-term in vitro 5G RF-EMR exposure disrupts the cytoskeleton, increasing membrane permeability and deformability.

Background/Objectives: Sarcopenia is a growing public health challenge in older adults, being associated with functional decline, frailty, and increased mortality. The SARC-F questionnaire is a widely recommended screening tool for sarcopenia; however, no validated Croatian version has been available so far. This study aimed to translate, culturally adapt, and validate the Croatian version of the SARC-F questionnaire for older adults. Methods: In a cross-sectional design, 153 participants aged ≥ 65 years from Zagreb and Bjelovar were enrolled between March and September 2025. Psychometric evaluation included internal consistency (Cronbach’s α), test–retest reliability (intraclass correlation coefficient, ICC), item–total correlations, and split-half reliability. Convergent validity was assessed via correlations with handgrip strength (HGS), Short Physical Performance Battery (SPPB), and timed up-and-go (TUG) tests. Known groups and construct validity were also examined. Results: The Croatian SARC-F showed good internal consistency (Cronbach’s α = 0.76; 95% CI: 0.70–0.82), with item–total correlations ranging from 0.34 (falls) to 0.80 (stairs) and excellent test–retest reliability (ICC = 0.86). Strong correlations were found with SPPB (ρ = −0.50; p < 0.001), TUG (ρ = 0.50; p < 0.001), and handgrip strength (ρ = −0.42; p < 0.001), supporting convergent validity. An exploratory factor analysis indicated a unidimensional structure explaining 43% of the variance. Conclusions: The Croatian version of SARC-F is a reliable, valid, and clinically feasible tool for identifying older adults who are at risk of sarcopenia. The results support its use in national screening and cross-cultural research across Europe.

Background and Objectives: Headaches have become one of the global public health burdens in the 21st century. Although findings on the presence of headaches in general and older adult populations have been well-documented, little evidence has been observed for university students. Moreover, their level of quality of life seems to be impaired due to stressful events and the inability to cope with them. However, the mutual relations between headaches and quality of life in this population remain unknown. Therefore, the main purpose of the study was to examine the associations between lifetime headaches and the presence of headaches in the last 12 months with quality of life. Materials and Methods: In total, 1350 university students (age = 22.9 ± 2.3 years; 81.3% female) were recruited. Each participant was instructed to fulfill the Headache-Attributed Restriction, Disability, Social Handicap, and Impaired Participation (HARDSHIP) questionnaire, a reliable and valid tool to assess headache and quality-of-life characteristics. Headache characteristics, headache-related disability (HALT-90), and quality-of-life domains were analyzed using Spearman’s correlation analyses and structural equation modeling. Results: Participants with migraine reported more frequent and more intense headaches and substantially greater headache-related disability compared with those with tension-type or undifferentiated headache. The mean number of lost days in the previous 90 days (HALT-90) was 14.3 (SD 23.1) in the migraine group compared with 4.53 (SD 12.0) in the tension-type headache group and 5.77 (SD 10.9) in the undifferentiated headache group. Across most WHOQOL domains, students with migraine reported lower quality-of-life scores compared with other headache groups. The WHOQOL-8 total score averaged 30.9 (SD 4.79) in the migraine group and 33.6 (SD 3.93) among participants without headache. Greater headache burden was consistently associated with poorer quality of life, with headache-related disability showing the strongest correlation with energy for everyday life (r = −0.345, p < 0.001). Conclusions: These findings suggest that greater headache burden, particularly migraine and headache-related disability, is associated with poorer quality of life among university students. The results highlight the need for targeted prevention programs aimed at helping students manage stress more effectively and improve their quality of life.

Background: Population aging represents a major public health challenge, accompanied by an increasing prevalence of chronic diseases and age-related functional decline. Declines in lower-extremity physical function are particularly important, as they are strongly associated with mobility limitations, loss of independence, increased risk of falls, hospitalization, and mortality in older adults. Reliable and valid tools to assess physical performance are therefore essential in both clinical and research settings. The Short Physical Performance Battery (SPPB) is a widely used instrument for assessing lower-extremity physical performance in older adults and is recommended within the diagnostic algorithm of the European Working Group on Sarcopenia in Older People (EWGSOP2) for evaluating physical performance severity. However, the SPPB has not yet been psychometrically validated in the Croatian older population. This study aimed to evaluate the reliability and validity of the SPPB in Croatian older adults. Methods: This study examined the metric properties of the SPPB in a sample of 153 older adults recruited from nursing homes and community settings. Results: The SPPB demonstrated acceptable internal consistency (Cronbach’s alpha = 0.74) and good test–retest reliability (ICC = 0.893) for the total score. Convergent and construct validity were supported by significant associations with established measures of functional mobility and muscle strength. Conclusions: The Croatian version of the SPPB is a reliable and valid instrument for assessing lower-extremity physical performance in older adults. Its use is supported in clinical practice and research settings in Croatia. Further studies should examine responsiveness and predictive validity in nationally representative samples.