Seasonal Variation in Vitamin D Status Does Not Interfere with Improvements in Aerobic and Muscular Endurance in Conscripts during Basic Military Training.

Considering a lack of respective data, the primary objective of this study was to assess whether seasonal variation in vitamin D status (D-status) affects the extent of improvement in physical performance (PP) in conscripts during basic military training (BMT). D-status, PP and several blood parameters were measured repeatedly in conscripts whose 10-week BMT started in July (cohort S-C; = 96) or in October (cohort A-C; = 107). D-status during BMT was higher in S-C compared to A-C (overall serum 25(OH)D 61.

High dose vitamin D supplementation decreases the risk of deficiency in male conscripts, but has no effect on physical performance-A randomized study.

Purpose: Physical load during military training might increase the need for vitamin D; therefore, supplementation could be beneficial for 25(OH)D serum levels and physical performance.

Methods: One hundred and twelve male conscripts were randomized into two vitamin D oil capsule supplementation groups: 55 participants in the 600 IU group and 57 in the 4000 IU group with a follow-up period from July 2021 to May 2022. Physical fitness tests were performed in July, October and May.

Severe deficiency of vitamin D has no negative effect on physical performance during military training.

Background: Decreased physical fitness and inferior physical performance are potentially life-threatening risk factors in a combat situation. To examine the effect of vitamin D on physical performance, a prospective study of young men conscripts in the Estonian Army was designed. The hypothesis of the study was that severe deficiency of vitamin D has a negative effect on physical performance.

Seven-month wintertime supplementation of 1200 IU vitamin D has no effect on hand grip strength in young, physically active males: A randomized, controlled study.

Background: There has been a growing interest in the role of vitamin D for the well-being and physical performance of humans under heavy training such as conscripts in military service; however, there is a lack of long-term supplementation studies performed on members of this type of young, physically active, male population. The hypothesis of the study was that vitamin D supplementation during wintertime will decrease the prevalence of critically low vitamin D blood serum levels and increase hand grip strength during the winter season among young male conscripts.

Study Design: Longitudinal, triple-blinded, randomized, placebo-controlled trial.

The prospects of strategic imagination in explaining international security challenges.

This paper will study the potential applicability of the strategic imagination method to international security analysis, which has been previously used to improve prognostic quality in business studies. The method should allow security experts to think about the future by considering "what if" situations, and creatively assess the probability of different threats, even those that appear as improbable to others. The components of the method include strategic fit (the actor's competence between its abilities and the needs of market), structure (the degree of concentration and maturity), competitive advantages (the extent to which the resources denied to the competition can be gathered, for example, access to novel technology), and strategic focus (i.