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Radman I.,University of Vienna | Wessner B.,University of Vienna | Bachl N.,University of Vienna | Bachl N.,Austrian Institute of Sports Medicine | And 4 more authors.
European Journal of Applied Physiology | Year: 2016

Purpose: The aim of the present study was to examine the acute effects of graded physiological strain on soccer kicking performance. Methods: Twenty-eight semi-professional soccer players completed both experimental and control procedure. The experimental protocol incorporated repeated shooting trials combined with a progressive discontinuous maximal shuttle-run intervention. The initial running velocity was 8 km/h and increasing for 1 km/h every 3 min until exhaustion. The control protocol comprised only eight subsequent shooting trials. The soccer-specific kicking accuracy (KA; average distance from the ball-entry point to the goal center), kicking velocity (KV), and kicking quality (KQ; kicking accuracy divided by the time elapsed from hitting the ball to the point of entry) were evaluated via reproducible and valid test over five individually determined exercise intensity zones. Results: Compared with baseline or exercise at intensities below the second lactate threshold (LT2), physiological exertion above the LT2 (blood lactate > 4 mmol/L) resulted in meaningful decrease in KA (11–13 %; p < 0.05), KV (3–4 %; p < 0.05), and overall KQ (13–15 %; p < 0.01). The light and moderate-intensity exercise below the LT2 had no significant effect on soccer kicking performance. Conclusions: The results suggest that high-intensity physiological exertion above the player’s LT2 impairs soccer kicking performance. In contrast, light to moderate physiological stress appears to be neither harmful nor beneficial for kicking performance. © 2015, Springer-Verlag Berlin Heidelberg.

Madarevic T.,University Hospital for Orthopaedic Surgery Lovran | Tudor A.,University Hospital for Orthopaedic Surgery Lovran | Sestan B.,University Hospital for Orthopaedic Surgery Lovran | Santic V.,University Hospital for Orthopaedic Surgery Lovran | And 3 more authors.
Knee Surgery, Sports Traumatology, Arthroscopy | Year: 2011

Purpose: As the blood loss after the total knee arthroplasty (TKA) is not only a potentially serious medical problem but also an economical concern, the purpose of the study was to investigate the effectiveness of different combinations of knee positioning and the applied wound dressings on blood saving after TKA. Methods: A randomized controlled trial including 147 TKA-operated patients was conducted. The subjects were assigned to one of the four groups; Group 1-controls, Group 2-flexion, Group 3-flexion and compression, Group 4-compression. The main outcome measures of the study were the blood loss volumes during the procedure and in the intensive care rooms and the decreases in haemoglobin, haemotocrit and red blood cells on the first and the second postoperative day. Results: The MANOVA results showed no differences between the groups in any of the observed parameters. The post-hoc comparisons of the each group to the control group also revealed no influence of any of the proposed blood saving techniques on the actual blood loss. Conclusion: No significant differences among the four proposed blood saving methods were determined. © 2010 Springer-Verlag.

Madarevic T.,University Hospital for Orthopaedic Surgery Lovran | Rakovac I.,University Hospital for Orthopaedic Surgery Lovran | Ruzic L.,University of Zagreb | Tudor A.,University Hospital for Orthopaedic Surgery Lovran | And 3 more authors.
Knee Surgery, Sports Traumatology, Arthroscopy | Year: 2014

Purpose: The endoscopic technique for resection of a postero-superior part of calcaneus served as a golden standard during the last 10 years, and it has mostly replaced the open techniques. In an effort to reduce the morbidity and the recovery time, we had introduced the ultrasound-assisted technique. Methods: In the period of 1 year, 15 patients with the prominent postero-superior part of calcaneus and retrocalcaneal bursitis were operated through the single skin incision using the ultrasound-assisted technique. The prominent part of calcaneus was resected with a bone abrader under the ultrasound control to the point when there was no impingement between Achilles tendon and calcaneus in maximal dorsal flexion. The patients were evaluated preoperatively and postoperatively with the AOFAS score and Ogilvie-Harris score. The strength test of the muscle triceps surae, as well as the proprioceptive test, was also undertaken. Results: Initially, the follow-up was meant to last 6 months, but there were no differences in results between 6 weeks and 3 months postoperatively, so it was concluded that the 3-month follow-up is sufficient and relevant. All 15 patients were available for follow-up. All measured variables significantly improved (AOFAS, Ogilvie-Harris), and all the patients were satisfied with the postoperative result. Only one minor complication occurred: superficial infection. Conclusion: The ultrasound-assisted calcaneoplasty enables a precise resection of the postero-superior part of calcaneus and removal of the retrocalcaneal impingement. This method could become clinically relevant as it enables effective treatment of Haglund deformity, and results of this study presented rapid functional recovery. Level of evidence: Case series with no comparison group, Level IV. © 2013 Springer-Verlag Berlin Heidelberg.

Ruzic L.,University of Zagreb | Prpic T.,University Hospital for Orthopaedic Surgery Lovran | Madarevic T.,University Hospital for Orthopaedic Surgery Lovran | Radman I.,University of Vienna | And 3 more authors.
Gait and Posture | Year: 2014

The aim of the study was to evaluate the influence of the physiological load on postural control. Special attention was directed toward the identifying the intensity level in which the major deterioration in balance abilities occurs. Thirty subjects randomly divided into two groups performed multistage all-out exertion protocol on cycle-ergometer with measurements of ventilatory-metabolic and subjective parameters of exertion. Each stage lasted three minutes and was followed with three minute breaks during which the subjects underwent the static (keeping the cursor in the center of the screen) and the dynamic balance testing (following the cursor clockwise or counter clock wise by body movements) on balance platform. In a control group, the protocol encompassed only balance testing procedures followed by 3. min rest. After the completion of the testing procedures, the five intensity zones were determined according to the ventilatory-metabolic parameters. The significant differences in both static and dynamic balance tests were found between the test stages in exercising group. The post hoc analyses revealed the significant negative effect of exercise on the static balance with three visible "balance thresholds". The first threshold was at the rest to work transition, the second at the anaerobic threshold and the third at the maximal exertion level. The dynamic balance was also negatively affected with exercise, however no "balance thresholds" were clearly identified. No significant changes in neither static nor dynamic balance abilities were observed in the control group so the changes in the experimental group could have been attributed to the exercise intensity. © 2013 Elsevier B.V.

Roth S.,Clinical Hospital Center Rijeka | Madarevic T.,University Hospital for Orthopaedic Surgery Lovran | Vukelic L.,University Hospital for Orthopaedic Surgery Lovran | Roth A.,University of Rijeka | And 3 more authors.
Archives of Orthopaedic and Trauma Surgery | Year: 2013

Introduction: The aim of this study is to prove the influence of the arthroscopic lateral release on functional recovery in adolescents with recurrent lateral dislocation of patella. Materials and methods: From 2006 to 2009, arthroscopic release of the lateral retinaculum was done on 27 adolescent patients (24 women, 3 men) and 33 knees (in 6 patients on both knees). All of them were active in different sports. The severity of patellar subluxation and dislocation was analysed on X-ray; the Q angle, congruence angle, sulcus angle, patellofemoral angle and height ratio were measured. Functional scores (Lysholm, Kujala, Tegner) were measured preoperatively and postoperatively. The average duration of clinical and X-ray follow-up was 4.5 years (range 3-6 years). Results: The mean age of the patients was 14.56 years (range 11-18 years). There was an average of 4.16 dislocations (range 2-28 dislocations) before surgery. The mean Lysholm score improved from 64 to 95 (p = 0.0002), and the mean Kujala score improved from 66 to 94 (p < 0.0001). Congruence angle and lateral patellofemoral angle improved but without any significant differences. Conclusion: Arthroscopic lateral release successfully treats recurrent patellar dislocations in adolescents, influences functional recovery and improves knee function. © 2013 Springer-Verlag Berlin Heidelberg.

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