Dynamic strength training intensity in cardiovascular rehabilitation: is it time to reconsider clinical practice? A systematic review

When added to endurance training, dynamic strength training leads to significantly greater improvements in peripheral muscle strength and power output in patients with cardiovascular disease, which may be relevant to enhance the patient’s prognosis. As a result, dynamic strength training is recommended in the rehabilitative treatment of many different cardiovascular diseases. However, what strength training intensity should be selected remains under intense debate. Evidence is nonetheless emerging that high-intensity strength training (≥70% of one-repetition maximum) is more effective to increase acutely myofibrillar protein synthesis, cause neural adaptations and, in the long term, increase muscle strength, when compared to low-intensity strength training. Moreover, multiple studies report that high-intensity strength training causes fewer increments in (intra-)arterial blood pressure and cardiac output, as opposed to low-intensity strength training, thus potentially pointing towards sufficient medical safety for the cardiovascular system. The aim of this systematic review is therefore to discuss this line of evidence, which is in contrast to current clinical practice, and to re-open the debate as to what dynamic strength training intensities should actually be applied.

Examining the effect of dynamic strenght trainıig on dribbling and passing performance versus ısometric strenght training on young basketball playersGenç basketbolcularda izometrik kuvvet antrenmanına karşın dinamik kuvvet antrenmanının top sürme ve pas performansına etkisinin incelenmesi

Propose of this study is evaluation of effect on ball driving and passing applied isometric strength with dynamic strength training in young baseball players. This study participated 14 male (mean age: 16.75 ± 0.4, height: 176.0 ± 5.6 cm, weight: 71.6 ± 14.4 kg, fitness age: 3.5 ± 0.8 years) was separated homogeneous 7 person group. Both groups was trained 3 days a week 2 hours throughout 8 weeks. While one of the groups doing isometric strenght training, other performed training with dynamic strenght training method. Effect of both training was evaluated by baseboll dribbling and passing tests. According to non-parametric method statistical analsis of the groups among themselves calculated Wilcoxon test and intergroups analysis calculated Mann Whitney U test. Significant difference, statistically valued at p: 0,018, is found in the valuation between dribble pre and posttest of Isometric strength group. Significant difference statistically valued at p: 0,026 , is found in the valuation between pass pre and posttest. Significant difference, statistically valued at p: 0,026, is found in the valuation between dribble pre and posttest of dynamic strength group. Significant difference statistically valued at p: 0,017, is found in the valuation between pass pre and posttest. While there is found p:0,016 valued significant difference in dribble test, there isn’t found p:0,304 valued significant difference in pass test. ÖzetBu çalışmanın amacı genç basketbolculara uygulanan izometrik kuvvete karşın dinamik kuvvet antrenmanlarının top sürme ve pas isabetine etkisinin incelenmesi olarak belirlenmiştir.Çalışmaya katılan 14 erkek sporcu (yaş 16.75 ± 0.4 yıl, boy 176.0 ± 5.6 cm, beden ağırlığı 71.6 ± 14.4 kg, antrenman yaşı 3.5 ± 0.8) homojen 7 şer kişilik gruba ayrılmıştır. Her iki gruba 8 hafta boyunca haftada 3 gün 2 saatlik antrenman yaptırılmıştır. Gruplardan biri izometrik kuvvet antrenmanı yaparken, diğeri dinamik kuvvet antrenman yöntemi ile antrenman uygulamıştır. Her iki antrenmanın etkisi basketbol dribling ve pas performans testi ile değerlendirilmiştir. Grupların kendi aralarındaki istatistiksel analizi parametrik olmayan yönteme göre Wilcoxon testi ile gruplar arası analiz ise Mann Whitney U testi ile hesaplanmıştır.İzometrik kuvvete ve dinamik kuvvet antrenmanlarının son testleri karşılaştırıldığında dribling testinde izometrik kuvvet antrenmanı lehine anlamlı farklılık bulunurken (p<0.05), pas testi karşılaştırmasında ise anlamlı farklılık bulunamamıştır (p>0.05). Bu sonucun izometrik antrenman yönteminin, kuvvet artırımında etkili olduğu ve top sürme performansını yükselttiği söylenebilir. Pas performansında ise matematiksel olarak gelişim olsa da istatistiksel olarak anlamlı fark bulunamamıştır. Bu sonuçlara göre iki antrenman yönteminin de yakın değerler vermesi bu antrenmanların performansı arttırma amacı ile kullanılabilir yöntemler olduğu düşünülebilir.

Dynamic Strength Training Improves Insulin Sensitivity without Altering Plasma Levels and Gene Expression of Adipokines in Subcutaneous Adipose Tissue in Obese Men

Context: Obesity is characterized by a low-grade inflammatory state, which could play a role in insulin resistance. Dynamic strength training improves insulin sensitivity. Objective: The objective of this study was to investigate, in obese subjects, whether the insulin sensitizing effect of dynamic strength training is associated with changes in plasma levels and gene expression of adipokines potentially involved in the development of insulin resistance. Design: Twelve obese male subjects were investigated before and at the end of 3 months of dynamic strength training. Insulin sensitivity was evaluated using euglycemic-hyperinsulinemic clamp. Blood samples and needle biopsy samples of sc abdominal adipose tissue were obtained. The plasma levels and adipose tissue mRNA levels of adiponectin, leptin, IL-1β, IL-6, and TNF-α were determined. Results: The training induced an increase in the whole-body glucose disposal rate by 24% (P = 0.04). The body weight was not altered during the training. Plasma levels of leptin decreased during the training (16.6 ± 6.3 vs. 13.1 ± 5.7 ng/ml) by 21% (P &lt; 0.02), whereas no change in plasma levels of other adipokines and C-reactive protein was observed. Gene expression of the investigated adipokines was not changed in sc adipose tissue during the training. Conclusions: In obese subjects, the dynamic strength training resulted in an improvement of whole-body insulin sensitivity. The increase in insulin sensitivity was not associated with training-induced modifications of plasma levels or adipose tissue gene expression of adipokines supposedly involved in the development of insulin resistance.