Loneliness and Social Isolation of Military Veterans: Systematic Narrative Review
Abstract: Loneliness and social isolation are being increasingly recognized as influencing both physical and mental health. There is limited research carried out with military veterans and, to date, there is no review of existing evidence. To synthesize and examine the evidence exploring aspects of social isolation and loneliness of military veterans, using a systematic narrative review strategy. A database search was carried out utilizing relevant search criterion. Seven databases were searched for publications with no date restrictions. Articles were included if they involved veterans and either social isolation or loneliness. The initial search returned 484 papers, after exclusions, removal of duplications, and a reference/citation search, 17 papers remained and were included in this review. The retrieved papers examined four areas of loneliness and social isolation: prevalence of loneliness in the veteran population, experiences related to military service as impacting loneliness or social isolation, the relationship between mental health and loneliness or social isolation, and interventions to combat loneliness and social isolation. Differences between the experiences of younger and older veterans were also highlighted. It is evident that military veterans present unique experiences of loneliness and social isolation, especially older veterans. This requires specific attention outside of campaigns targeted at the nonmilitary population.
Abstract: Changes in physiological markers and physical performance in relation to paratroopers' initial body composition were investigated during a 20-day winter military field training (MFT) and the subsequent 10-day recovery period. Body composition, serum hormone concentrations and enzymatic biomarkers, and physical performance of 58 soldiers were measured before, during, and after MFT. Comparisons were done according to soldiers' body fat percentage before MFT between low-fat (12% body fat) groups. Correlations between body fat percentage preceding MFT and changes in muscle mass, physical performance, and serum hormone concentrations and enzymatic biomarkers were investigated. It was hypothesized that soldiers with a higher fat percentage would have smaller decrements in muscle mass, physical performance, and serum testosterone concentration. The change in muscle and fat mass was different between groups (p < 0.001) as the low-fat group lost 0.8 kg of muscle mass and 2.0 kg of fat mass, while there was no change in muscle mass and a loss of 3.7 kg of fat mass in the high-fat group during MFT. Fat percentage before MFT correlated with the changes in muscle mass (R2 = 0.26, p < 0.001), serum testosterone concentration (R-2 = 0.22, p < 0.001), and evacuation test time (R-2 = 0.10, p < 0.05) during MFT. The change in muscle mass was correlated with the changes in evacuation test time (R-2 = 0.11, p < 0.05) and countermovement jump test results (R-2 = 0.13, p < 0.01) during MFT. Soldiers with a higher initial fat percentage lost less muscle mass, and had smaller decrements in some aspects of physical performance, as well as in serum testosterone concentration during MFT.