Objective: Prolonged water-only fasting has garnered significant interest for its potential health benefits, including enhanced metabolic flexibility and cardiovascular improvements. This case study explores the physiological and metabolic responses of a healthy 36-year-old male during a 10-day water-only fast, followed by a structured 5-day refeeding phase.Methods: Key parameters such as heart rate variability (HRV), respiratory quotient (RQ), resting metabolic rate (RMR), oxygen consumption (VO₂), and sleep quality were monitored throughout the fasting and refeeding periods. Data collection was conducted at the Laboratory of Atatürk University Faculty of Medicine in February 2025.Results: Findings revealed substantial metabolic adaptations, including a decline in RMR from 2040 kcal/day to 1342kcal/day and a reduction in RQ from 0.89 to 0.74 by fasting day 7, indicating a shift from carbohydrate to fat oxidation. Cardiovascular parameters, including blood pressure and heart rate, remained stable, while sleep patterns exhibitednotable variability, with a marked reduction in deep sleep after the third day of fasting. During the refeeding phase, metabolic and physiological parameters progressively returned to baseline levels, underscoring the importance ofdietary reintroduction in restoring homeostasis.Conclusion: This study highlights the dynamic interplay between metabolic rate, substrate utilization, and cardiovascular stability during prolonged fasting and refeeding. While the findings align with existing literature, the resultsemphasize the individuality of fasting responses and the necessity for medical supervision. These insights contributeto the growing body of evidence supporting water-only fasting as a potentially safe and effective intervention for metabolic health, warranting further investigation in diverse populations.Cite this article as: Ulupınar S, Özbay S, Bedi̇r D, et al. Comprehensive analysis of biological and metabolic changes during a 10-day water-only fasting: A case study.Arch Health Sci Res. 2025; 12, 0058, doi: 10.5152/ArcHealthSciRes.2025.25058.

Walking is the first locomotor movement developed by humans after reflexive movements and balancing processes. This study aimed to evaluate walking patterns of middle-aged individuals who lead a sedentary life and to compare gait parameters in terms of gender and body mass index. This study contained eighty-four voluntarily participants (30.00±6.94 years; 74.02±15.44 kg; 170.23±8.94 cm). All participants were sedentary individuals who had not undergone any lower extremity surgery, did not use any movement system medication. Height was assessed by using a wall-mounted stadiometer. Weight was assesed by using Tanita TBF-300. Gait Analysis were performed by Microgate Optogait. All tests were carried out in the same air-conditioned lab which was set to 20°C and 1890 m altitude. Gait parameters were directly provided from Microgate Optogait. The differences between women and men, fat and normal weight were determined using an analysis of variance with Independent T test. All the data were shown as mean and standard deviation. In statistical analysis, the level of significance was chosen as p0.05) in all parameters. There was just significantly difference contact phase and propulsive phase according to gender and double support phase according to BMI. There was also bilaterally difference contact phase, the overweights had more imbalance and interestingly in favor of the non-dominant limb. The mean values of the gait values obtained were similarly the norm values of healthy middle-aged individuals.

Spor kavramı genel anlamıyla farklılık gösterse de en yaygın tanımlarından biri kurallar çerçevesinde rekabete dayalı fiziksel ve zihinsel rekabetin olduğu branşa göre yapılan yarışma etkinlikleridir. Günümüzde en çok karıştırılan kavram olan spor ve Beden eğitimi ve Spor ‘dur. Beden Eğitimi ve Sporda rekabet olmadan fiziksel uygunluk için yapılan rekreasyonel faaliyetler yer almaktadır. Ancak sporun içerisinde fiziksel uygunluğun yanı sıra rekabete dayalı sürekli bir gelişim ve hatasız bir performans ön plana çıkmaktadır. Bu performansı değerlendirecek antrenör, sporcu ve yöneticiler için veriler çok önemli bir durumdur. Performans göstergelerini değerlendirecek verilerin incelenmesi, düzenlenmesi ve değerlendirilmesi performans göstergelerinde ortaya çıkan bütün durumların ele alınmasını sağlamaktadır. Sporda performans göstergeleri antrenman sırası, müsabaka sırası ve müsabaka sonrası şeklinde üç şekilde teknolojik araçlarla alınabilmektedir. Bu göstergelerin en nesnel ve elle tutulabilir hali müsabaka ortamında sporcunun gösterdiği gerçek değerlerin anlamı spor bilimcilere birçok dönüt verebilmektedir. Müsabaka anında göstermiş olduğu gerçek tepkilerin ölçülmesinde de bu teknolojik araçlardan hemen hemen bütün spor dallarında yararlanılmaktadır. Bu araştırmada gelecekte sporun bütün dallarına yöne verecek olan teknolojik sportif performans ölçüm araçlarını bir değerlendirme içerinde görerek bu alanın bilime nasıl yöne vereceğini değerlendirmiş olacağız.

High-intensity exercise challenges acid-base homeostasis, often limiting performance due to hydrogen ion (H⁺) accumulation. This study investigated the effects of voluntary hyperventilation-induced hypocapnia (a state of reduced carbon dioxide levels in the blood) on Wingate test performance and energy system contributions in team sport athletes. Seventeen male athletes performed 30-second Wingate tests under control and hyperventilation conditions, separated by 2–3 days. Hyperventilation involved 5 min of controlled breathing with a tidal volume of 1000 mL and a respiratory frequency of 30 breaths·min⁻¹ to induce hypocapnia before the test. Performance metrics (peak and mean power), energy system contributions (oxidative, glycolytic, ATP-PCr), and blood lactate accumulation (Δ[BLa⁻]) were assessed using breath-by-breath gas analysis and capillary blood samples. Paired t-tests revealed that hyperventilation significantly increased relative peak power (12.7 ± 1.55 vs. 11.9 ± 1.05 W·kg⁻¹, p = 0.007) and mean power (9.0 ± 0.65 vs. 8.6 ± 0.67 W·kg⁻¹, p = 0.005) compared to control. However, no differences were observed in energy system contributions (oxidative: 20.1 ± 3.9% vs. 20.4 ± 2.3%; glycolytic: 41.1 ± 4.7% vs. 41.4 ± 3.7%; ATP-PCr: 38.9 ± 5.5% vs. 38.4 ± 4.2%), total energy expenditure, or Δ[BLa⁻] (12.6 ± 1.9 vs. 12.8 ± 1.2 mmol·L⁻¹). These findings suggest that hyperventilation enhances anaerobic performance without altering energy metabolism, potentially through improved buffering capacity, neuromuscular activation, or oxygen redistribution. All values are reported as mean ± standard deviation (SD). This endogenous strategy offers a practical approach to optimize short-duration, high-intensity efforts, though further research is needed to refine its application across varied protocols and populations.

The running performance and strength is important for many runners. This study aimed to examine hip joint isokinetic strength profiles of elite middle-distance runners. Nine elite middle-distance runners volunteered to participate in this study. Hip joint isokinetic muscle strength was measured using by an isokinetic dynameters. Participants performed isokinetic tests on dominant and non-dominant legs at a speed of 60°-s-1 for 10 repetitions. Isokinetic tests were conducted to flexion/extension, abduction/adduction and internal/external rotation movements of hip at concentric/concentric mode. There was no significant difference between dominant and non-dominant legs in peak torque and relative peak torque values. When the hip flexors were evaluated bilaterally, it was determined that the non-dominant side produced higher torque than the dominant side. However, in all other movements, the dominant side had higher torque values than the non-dominant side. As a result; on evaluated all joint movements bilaterally, hip flexor/extensor and adductor muscles were in normal values. However, hip abductor and internal/external rotator muscles values were in a risky range.

The purpose of this study was to compare effects of 12-weeks tradinational resistance training (TRT) on total work (TW), relative peak work (RPW) and peak power (PP) in elite national curlers. Twenty-four participants were included in the study. Subjects were separated into two gorup, resistance training group (RES) and control group (CON). While RES performed 12-week TRT in addiction to curling training, CON just performed curling training. All twenty-four national elite curling athletes performed a body composition test and isokinetic strength test at 240-1/ms angular speed pre and post TRT. TW and PP values were directly obtained from isokinetic dynamometer and RPW was calculated by dividing the peak work values by the body weight of the person. The differences between RES/CON and pre-post in TW, RPW and PP variables were determined using an analysis of variance with Independent T Test. The data obtained from the research were shown as mean and standard deviation. Higher TW, RPW, and PP outputs were generated in the RES in comparison with the CON exercise (p 0.05).