scholarly journals The Effects of High-Intensity versus Low-Intensity Resistance Training on Leg Extensor Power and Recovery of Knee Function after ACL-Reconstruction

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Theresa Bieler ◽  
Nanna Aue Sobol ◽  
Lars L. Andersen ◽  
Peter Kiel ◽  
Peter Løfholm ◽  
...  
Keyword(s):  
Resistance Training ◽  
Adverse Effects ◽  
Acl Reconstruction ◽  
High Intensity ◽  
Muscle Power ◽  
Knee Function ◽  
Joint Laxity ◽  
Significant Group ◽  
Low Intensity ◽  
Leg Extensor Power

Objective. Persistent weakness is a common problem after anterior cruciate ligament- (ACL-) reconstruction. This study investigated the effects of high-intensity (HRT) versus low-intensity (LRT) resistance training on leg extensor power and recovery of knee function after ACL-reconstruction.Methods. 31 males and 19 females were randomized to HRT (n=24) or LRT (n=26) from week 8–20 after ACL-reconstruction. Leg extensor power, joint laxity, and self-reported knee function were measured before and 7, 14, and 20 weeks after surgery. Hop tests were assessed before and after 20 weeks.Results. Power in the injured leg was 90% (95% CI 86–94%) of the noninjured leg, decreasing to 64% (95% CI 60–69%) 7 weeks after surgery. During the resistance training phase there was a significant group by time interaction for power (P=0.020). Power was regained more with HRT compared to LRT at week 14 (84% versus 73% of noninjured leg, resp.;P=0.027) and at week 20 (98% versus 83% of noninjured leg, resp.;P=0.006) without adverse effects on joint laxity. No other between-group differences were found.Conclusion. High-intensity resistance training during rehabilitation after ACL-reconstruction can improve muscle power without adverse effects on joint laxity.

Contralateral training effects of low-intensity blood-flow restricted and high-intensity unilateral resistance training

2021 ◽  
Author(s):  
Goncalo V. Mendonca ◽  
Carolina Vila-Chã ◽  
Carolina Teodósio ◽  
André D. Goncalves ◽  
Sandro R. Freitas ◽  
...  
Keyword(s):  
Blood Flow ◽  
Resistance Training ◽  
High Intensity ◽  
Training Effects ◽  
Low Intensity

scholarly journals Poor Performance on Single-Legged Hop Tests Associated With Development of Posttraumatic Knee Osteoarthritis After Anterior Cruciate Ligament Injury

2018 ◽  
Vol 6 (11) ◽  
pp. 232596711881077 ◽  
Author(s):  
Elizabeth Wellsandt ◽  
Michael J. Axe ◽  
Lynn Snyder-Mackler
Keyword(s):  
Acl Reconstruction ◽  
Cruciate Ligament ◽  
Poor Performance ◽  
Acl Injury ◽  
Knee Function ◽  
Significant Group ◽  
Knee Oa ◽  
Hop Tests ◽  
Anterior Cruciate ◽  
Clinical Measures

Background: The risk for knee osteoarthritis (OA) is substantially increased after anterior cruciate ligament (ACL) injury. Tools are needed to identify characteristics of patients after ACL injury who are most at risk for posttraumatic OA. Purpose: To determine whether clinical measures of knee function after ACL injury are associated with the development of radiographic knee OA 5 years after injury. Study Design: Cohort study; Level of evidence, 2. Methods: A total of 76 athletes (mean age, 28.7 ± 11.3 years; 35.5% female) with ACL injury were included. Clinical measures of knee function (quadriceps strength, single-legged hop tests, patient-reported outcomes) were assessed after initial impairment resolution (baseline), after 10 additional preoperative or nonoperative rehabilitation sessions (posttraining), and 6 months after ACL reconstruction or nonoperative rehabilitation. Posterior-anterior bent-knee radiographs were completed at 5 years and graded in the medial compartment by use of the Kellgren-Lawrence system. Logistic regression models were used at each of the 3 time points to determine the ability of clinical measures to predict knee OA at 5 years. Results: Of the 76 patients, 9 (11.8%) had knee OA at 5 years. After adjustment for ACL reconstruction compared with nonoperative management, ipsilateral second ACL injuries, and the presence of contralateral knee OA, clinical measures of knee function at posttraining (6-m timed hop, Knee Outcomes Survey–Activities of Daily Living Scale) explained the most variance in posttraumatic OA development at 5 years ( P = .006; ▵ R2, 27.5%). The 6-m hop test was the only significant posttraining predictor of OA at 5 years ( P = .023; patients without OA, 96.6% ± 5.4%; patients with OA, 84.9% ± 14.1%). Similar significant group differences in hop scores and subjective knee function were present at baseline. No significant group differences in clinical measures existed at 6 months after ACL reconstruction or nonoperative rehabilitation. Conclusion: Poor performance in single-legged hop tests early after ACL injury but not after reconstruction or nonoperative rehabilitation is associated with the development of radiographic posttraumatic knee OA 5 years after injury. Clinical measures of knee function were most predictive of subsequent OA development following an extended period of rehabilitation early after ACL injury.

scholarly journals Interleukin-6 and Vitamin D Status during High-Intensity Resistance Training in Patients with Chronic Kidney Disease

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Stig Molsted ◽  
Pia Eiken ◽  
Jesper L. Andersen ◽  
Inge Eidemak ◽  
Adrian P. Harrison
Keyword(s):  
Vitamin D ◽  
Resistance Training ◽  
Vitamin D Deficiency ◽  
Muscle Fibre ◽  
High Intensity ◽  
Muscle Power ◽  
Control Period ◽  
Dialysis Patients ◽  
Muscle Fibre Size ◽  
Fibre Size

Background. The aim of this study was to investigate IL-6 and 25-hydroxyvitamin D (25-OH D) associations with muscle size and muscle function in dialysis patients.Methods. Patients were included in a 16-week control period followed by 16 weeks of high-intensity resistance training thrice weekly. IL-6 and 25-OH D were analysed after an over-night fast. Muscle fibre size was analysed in biopsies fromm. vastus lateralis. Muscle power was tested using a Leg Extensor Power Rig.Results. Patients (n=36) with IL-6 ≥ 6.49 pg/ml (median) were older and had decreased muscle power and a reduced protein intake (P<0.05) compared with patients with IL-6 < 6.49 pg/ml. IL-6 was not associated with muscle fibre size. Vitamin D deficiency (25-OH D < 50 nmol/l) was present in 51% of the patients and not associated with muscle power. IL-6 remained unchanged during the training period, whilst muscle power increased by 20–23% (P<0.001).Conclusion. Elevated IL-6 values were associated with decreased muscle power but not with decreased muscle fibre size. Half of the patients were suffering from vitamin D deficiency, which was not associated with muscle power. IL-6 was unchanged by high-intensity resistance training in dialysis patients in this study.

scholarly journals The Effect of Circuit Resistance Training With Varying Intensity on Selected Inflammatory Markers in Obese Men

2021 ◽  
Author(s):  
Saeid Emamdoost ◽  
Asieh Abbassi Daloii ◽  
Alireza Barari ◽  
Ayoub Saeidi
Keyword(s):  
Body Mass Index ◽  
Resistance Training ◽  
High Intensity ◽  
Inflammatory Markers ◽  
Serum Levels ◽  
Moderate Intensity ◽  
Low Intensity ◽  
Circuit Resistance Training ◽  
Circuit Resistance ◽  
Intensity Training

Obesity and associated chronic inflammation lead to insulin resistance. The aim of this study was to evaluate the effect of varying intensity circuit resistance training on metabolic and inflammatory markers in obese men. In a semi-experimental trial, 44 obese men were selected and randomly divided into four groups, including 1) Control (n=11), 2) Low-intensity circuit resistance training (n=11), 3) Moderate-intensity circuit resistance training (n=11), and 4) High-intensity circuit resistance training (n=11). Resistance training was performed at different intensities, including 1) High-intensity circuit resistance training (80% 1RM), 2) Moderate-intensity circuit resistance (60% 1RM), and 3) Low-intensity circuit resistance training (40% 1RM), three sessions per week for 12 weeks. Serum levels of Dectin-1, TLR2, TLR4, MyD88 were measured using an ELISA kit. Data were analyzed with covariance analysis at P<0.05. Twelve weeks of moderate and high-intensity circuit resistance training significantly reduced weight, body mass index, serum levels of Dectin-1, TLR2, TLR4, MyD88, and HOMA-IR (P=0.001). The reduction of weight, body mass index, serum levels of Dectin-1, TLR2, TLR4, MyD88, and HOMA-IR were significant in obese men in the high-intensity training group compared to low-intensity training (P=0.001). It seems that circuit resistance training, especially high-intensity circuit resistance training, can be used as an option to reduce the inflammatory and metabolic complications associated with obesity.  

scholarly journals The Effect of Eccentric Resistance Training with and Without Blood Flow Restriction on Serum IL6 and MMP9 Levels in Young Active Men

2020 ◽  
Vol 7 (4) ◽  
Author(s):  
Mohammad Eslamdoust ◽  
Farshad Ghazalian ◽  
Mandana Gholami ◽  
Khosrow Ebrahim ◽  
Behzad Bazgir
Keyword(s):  
Blood Flow ◽  
Resistance Training ◽  
Resistance Exercise ◽  
Eccentric Exercise ◽  
High Intensity ◽  
Young Men ◽  
Blood Flow Restriction ◽  
Exercise Modality ◽  
Flow Restriction ◽  
Low Intensity

Background: It has been assumed that during and after BFR exercises, many blood factors are activated and angiogenesis response is stimulated in the arteries. Objectives: Therefore, the current study aimed to determine the effect of two eccentric resistance training methods with and without blood flow restriction on serum IL6 and MMP9 levels in active young men. Methods: In this quasi-experimental study, 16 healthy men with a mean age of 27.8 ± 2.85 (years), the weight of 79.4 ± 12.4 (kg), and a body mass index of 25.5 ± 3.7 (kg/m2) were randomly assigned to either low-intensity eccentric group with BFR or the high-intensity eccentric without BFR. The high-intensity (70% - 80% maximum voluntary contraction MVC) eccentric exercise without BFR included 3 - 5 cycles of eccentric contraction of the quadriceps muscles, up to exhaustion, whereas low-intensity eccentric exercise executed similar exercise modality at intensity of 20% - 30% MVC with blood flow restriction up to exhaustion. Blood samples were taken from antecubital both before and after the exercise to measure serum IL6 and MMP9 values using the ELISA method. Data were analyzed using paired t-test and analysis of variance with repeated measure test in SPSS version 22. A P value of < 0.05 was defined as statistically significant. Results: High-intensity resistance per se and low-intensity resistance exercise with BFR similarly resulted in a non-significant reduction of IL-6 and elevated levels of MMP-9 serum levels in active young men. Conclusions: Overall, the results indicated that a low-intensity resistance exercise session with restricted blood flow and a high-intensity resistance exercise without blood flow restriction equally did not affect IL6 and MMP9 serum of active young men. Further studies are needed to clarify the exact exercise modality that sufficiently stimulates angiogenesis.

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