Thermal Stress and Physical Activity

WOS: 000383578300016

THE EFFECTS OF AEROBIC EXERCISE ON SKELETAL MUSCLE METABOLISM, MORPHOLOGY AND IN SITU ENDURANCE IN DIABETIC RATS

The effects of aerobic exercise training on skeletal muscle endurance capacity were examined in diabetic rats in situ. Moderate diabetes was induced by iv injection of streptozotocin and an exercise training program on a treadmill was carried out for 8 weeks. The animals randomly assigned to one of the four experimental groups: control-sedentary (CS), control-exercise (CE), diabetic-sedentary (DS) or diabetic-exercise (DE). The changes in the muscle endurance capacity were evaluated through the square wave impulses (supramaximal) of 0.2-ms duration at 1 Hz in the in situ gastrocnemius-soleus muscle complex. Muscle was stimulated continuously until tension development reduced to the half of this maximal value. Time interval between the beginning and the end of stimulation period is defined as contraction duration. Following the training period, blood glucose level reduced significantly in the DE group compared to DS group (p < 0.05). The soles muscle citrate synthase activity was increased significantly in both of the trained groups compared to sedentary animals (p < 0.05). Fatigued muscle lactate values were not significantly different from each other. Ultrastractural abnormality of the skeletal muscle in DS group disappeared with training. Presence of increased lipid droplets, mitochondria clusters and glycogen accumulation was observed in the skeletal muscle of DE group. The contraction duration was longer in the DE group than others (p < 0.001). Fatigue resistance of exercised diabetic animals may be explained by increased intramyocellular lipid droplets, high blood glucose level and muscle citrate synthase activit

ANALYSIS OF ISOKINETIC KNEE EXTENSION / FLEXION IN MALE ELITE ADOLESCENT WRESTLERS

Wrestling requires strength of the upper and lower body musculature which is critical for the athletic performance. Evaluation of the adolescent's skeletal muscle is important to understand body movement, especially including those involved in sports. Strength, power and endurance capacity are defined as parameters of skeletal muscle biomechanical properties. The isokinetic dynamometer is an important toll for making this type of evaluation. However, load range phase of range of motion has to be considered to interpret the data correctly. With this in mind we aimed to investigate the lover body musculature contractile characteristics of adolescent wrestlers together with detailed analyses of load range phase of motion. Thirteen boys aged 12 - 14 years participated to this study. Concentric load range torque, work and power of knee extension and flexion were measured by a Cybex Norm dynamometer at angular velocities from 450°/sec to 30°/sec with 30°/sec decrements for each set. None of the wrestlers were able to attain load range for angular velocities above 390°/sec and 420°/sec for extension and flexion respectively. Detailed analyses of the load range resulted in statistically significant differences in the normalized load range peak torque for extension at 270°/sec (1.44 ± 0.28 Nm·kg-1 and 1.14 ± 0.28 Nm·kg-1 for total and load range peak torque respectively, p < 0.05), and for flexion at 300°/sec (1.26 ± 0.28 Nm·kg-1 and 1.03 ± 0.23 Nm·kg-1 for total and load range peak torque respectively, p < 0.05), compared to total peak torque data. Similarly, the significant difference was found for the work values at 90°/sec (1.91 ± 0.23 Nm·kg-1 and 1.59 ± 0.24 Nm·kg-1 for total and load range work respectively for extension and 1.73 ± 0.21 Nm·kg-1 and 1.49 ± 0.19 Nm·kg-1 for total and load range work respectively for flexion, p < 0.05), and was evident at higher angular velocities (p < 0.001) for both extension and flexion. At extension, load range power values were significantly smaller than total power for all angular velocities except 150°/sec (p < 0.05 for 120 and 180°/sec, p < 0.001 for others). Finally, load range flexion power was found to be higher than total power with statistically significance (p < 0.05 for 60, 120, 150, 180, 210, 270 and 300°/sec, p < 0.001 for 240 °/sec). Extra caution is required for correct interpretation of load range data in terms of considering the load range during limb movement. Evaluation of muscle performance of these adolescent wrestlers at regular intervals may give us an opportunity to obtain a healthy maturation profile of these adolescent wrestler

Effect of water exercise on atrophic muscles associated with limited range of motion in severe haemophilia A patients: A pilot study

Purpose: Haemophilia causes musculoskeletal problems over many years secondary to recurrent hemarthrosis. In this study, the effects of water exercises on the musculoskeletal system of severe haemophilia A patients with muscle and joint problems were investigated. Material and Methods: Eleven severe haemophilia A patients on prophylaxis treatment participated in the study and following a regular exercise protocol. Results: Subjects displayed statistically significant increases in mid-thigh, upper thigh and calf circumference for right leg (42.0 +/- 2.4, 43.0 +/-2.1 ; 37.1 +/-1.9, 39.0 +/-1.8; 28.1 +/- 1.4, 28.9 +/-1.3 respectively) (mean +/- SE) in mid-thigh and upper thigh for left leg (36.9 +/- 1.5 , 38.9 +/- 1.5 ; 41.2 +/- 2.2 , 42.9 +/- 2) (p 0.05). Compared to pre-exercise values, leg extensor and flexor strength as well as range of motion were increased significantly (96.6 +/- 9 and #7506; vs 104.5+/- 8 and #7506;; before and after training for right knee, 98.5 +/- 7.6 and #7506; vs 104 +/- 7.9 and #7506; before and after training for left leg respectively) (p 0.05). In addition to that, post training serum level of growth hormone was found to be significantly higher than the pertaining value (p 0.05). Conclusion: These results show that some easily performed exercise protocols such as water exercises can promote muscle development and increase range of motion of the knee joint. Our findings indicate that appropriately designed water exercise may prevent muscle atrophy and joint deformities in haemopliliac patients. [Cukurova Med J 2014; 39(3.000): 470-479

Şiddetli Hemofili A Hastalarında Sınırlanmış Eklem Açıklığı ile İlişkili Atrofik Kaslarda Su İçi Egzersizlerin Etkisi: Bir Pilot Çalışma

Amaç: Hemofili tekrarlayan kanama ataklarına sekonder olarak kas- iskelet sorunlarına neden olmaktadır. Bu çalışmada, su içi egzersizlerinin, kas ve eklem problemleri olan şiddetli hemofili A hastalarında etkilerinin araştırılması amaçlanmıştır. Materyal ve Metod: Proflaksi alan, şiddetli hemofili A hastası (n=11) düzenli olarak egzersiz uygulamasına alınmıştır. Bulgular: Çalışmaya katılan hastaların, sağ bacaklarında üst bacak, orta bacak ve calf çevrelerinde (42.0 ± 2.4, 43.0 ±2.1 ; 37.1 ±1.9, 39.0 ±1.8; 28.1 ± 1.4, 28.9 ±1.3 respectively) (mean ± SE), sol bacaklarında üst ve orta bacak çevrelerinde (36.9 ± 1.5 , 38.9 ± 1.5 ; 41.2 ± 2.2 , 42.9 ± 2) egzersiz öncesi değerlerine göre istatistiksel olarak anlamlı farklılık bulunmuştur (p<0.05). Egzersiz öncesi değerlerle karşılaştırıldığında ekstensör ve fleksör kuvvetlerde olduğu gibi eklem hareket açıklığı(ROM) da anlamlı olarak artmıştır.(Sağ diz için ROM (96.6 ± 9º ,104.5± 8º; sol diz için 98.5 ± 7.6 º ,104 ± 7.9º) İlaveten, büyüme hormonu egzersiz sonrası değerleri, öncesine göre anlamlı olarak bulunmuştur.(p<0.05) Tartışma: Bu sonuçlar bize, su içi egzersizler gibi kolayca yapılabilecek egzersizlerin diz eklem hareket açıklığını ve kas kuvvetini arttırabileceğini göstermektedir. Bulgularımız göstermektedir ki, uygun olarak düzenlenmiş suiçi egzersizler hemofili hastalarında kas atrofisi ve eklem deformitelerini önleyebilir.Purpose: Haemophilia causes musculoskeletal problems over many years secondary to recurrent hemarthrosis. In this study, the effects of water exercises on the musculoskeletal system of severe haemophilia A patients with muscle and joint problems were investigated. Material and Methods: Eleven severe haemophilia A patients on prophylaxis treatment participated in the study and following a regular exercise protocol. Results: Subjects displayed statistically significant increases in mid-thigh, upper thigh and calf circumference for right leg (42.0 ± 2.4, 43.0 ±2.1 ; 37.1 ±1.9, 39.0 ±1.8; 28.1 ± 1.4, 28.9 ±1.3 respectively) (mean ± SE) in mid-thigh and upper thigh for left leg (36.9 ± 1.5 , 38.9 ± 1.5 ; 41.2 ± 2.2 , 42.9 ± 2) (<0.05). Compared to pre-exercise values, leg extensor and flexor strength as well as range of motion were increased significantly (96.6 ± 9º vs 104.5± 8º; before and after training for right knee, 98.5 ± 7.6 º vs 104 ± 7.9 º before and after training for left leg respectively) (<0.05). In addition to that, post training serum level of growth hormone was found to be significantly higher than the pertaining value (<0.05). Conclusion: These results show that some easily performed exercise protocols such as water exercises can promote muscle development and increase range of motion of the knee joint. Our findings indicate that appropriately designed water exercise may prevent muscle atrophy and joint deformities in haemopliliac patients