TY - JOUR AU - Padulo, J AU - Annino, G AU - D'ottavio, S AU - Vernillo, G AU - Smith, L AU - Migliaccio, GM AU - Tihanyi, József TI - Footstep analysis at different slopes and speeds in elite race walking JF - JOURNAL OF STRENGTH AND CONDITIONING RESEARCH J2 - J STRENGTH CONDIT RES VL - 27 PY - 2013 IS - 1 SP - 125 EP - 129 PG - 5 SN - 1064-8011 DO - 10.1519/JSC.0b013e3182541eb3 UR - https://m2.mtmt.hu/api/publication/2018288 ID - 2018288 AB - In order to investigate the effects of speed and slope on kinematic parameters, we studied the step parameters of twelve elite race-walkers on a treadmill at different speeds (3.61, 3.89 and 4.17 m.s) and slopes (0, 2 and 7%). A high-speed digital camera (210 Hz) was used to record motion, 2D data were analyzed with Dartfish 5.5Pro. The parameters studied were step length (SL), step frequency (SF) and contact time (CT). The results showed that the increases in SL were linearly related to increases in speed: r = 0.37 with p < 0.01 while decreases in SL were elicited with an increase in slope r = -0.56, p < 0.0001 [(0-2% = -3.5%, p < 0.02), (0-7% = -7.5%, p < 0.01)]. SF was positively correlated with increases in speed r = 0.56, p 0.0001 and slopes r = 0.50, p < 0.0001 [(0-2% = 3.6% n.s.), (0-7% = 8.5%, p < 0.01)]. Conversely CT was negatively correlated with increases of both speed; r = -0.57, p < 0.0001 and slope r = -0.50, p < 0.0001 [(0-2% = -3.4%, n.s.), (0-7% = -7.7%, p < 0.01)]. These results suggest that using slopes higher than 7% could considerably alter the neuromechanical behaviour of athletes, whereas slopes around 2% could positively influence the performance of the elite race walkers without altering race-walking technique. LA - English DB - MTMT ER - TY - JOUR AU - R, Di Giminiani AU - F, Masedu AU - Tihanyi, József AU - R, Scrimaglio AU - M, Valenti TI - The interaction between body position and vibration frequency on acute response to whole body vibration JF - JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY J2 - J ELECTROMYOGR KINES VL - 23 PY - 2013 IS - 1 SP - 245 EP - 251 PG - 7 SN - 1050-6411 DO - 10.1016/j.jelekin.2012.08.018 UR - https://m2.mtmt.hu/api/publication/2334186 ID - 2334186 AB - Purpose: The present study was designed to investigate the electromyographic (EMG) response in leg muscles to whole-body vibration while using different body positions and vibration frequencies. Methods: Twenty male sport sciences students voluntarily participated in this single-group, repeated-measures study in which EMG data from the vastus lateralis (VL) and the lateral gastrocnemius (LG) were collected over a total of 36 trials for each subject (4 static positions. ×. 9 frequencies). Results: We found that vibration frequency, body position and the muscle stimulated had a significant effect (P-values ranged from 0.001 to 0.031) on the EMG response. Similarly, the muscle. ×. frequency and position. ×. muscle interactions were significant (P<. 0.001). Interestingly, the frequency. ×. positions interactions were not significant (P>. 0.05). Conclusions: Our results indicate that lower frequencies of vibration (25-35. Hz) result in maximal activation of LG, whereas higher frequencies (45-55. Hz) elicit the highest responses in the VL. In addition, the position P2 (half squat position with the heels raised) is beneficial both for VL and LG, independently of the vibration frequency. © 2012 Elsevier Ltd. LA - English DB - MTMT ER - TY - JOUR AU - Padulo, J AU - Annino, G AU - Migliaccio, GM AU - D'Ottavio, S AU - Tihanyi, József TI - Kinematics of Running at Different Slopes and Speeds JF - JOURNAL OF STRENGTH AND CONDITIONING RESEARCH J2 - J STRENGTH CONDIT RES VL - 26 PY - 2012 IS - 5 SP - 1331 EP - 1339 PG - 9 SN - 1064-8011 DO - 10.1519/JSC.0b013e318231aafa UR - https://m2.mtmt.hu/api/publication/1848204 ID - 1848204 AB - Padulo, J, Annino, G, Migliaccio, GM, D'Ottavio, S, and Tihanyi, J. Kinematics of running at different slopes and speeds. J Strength Cond Res 25(X): 000-000, 2011-The aim of this study was to verify the influence of the combination of different running speeds and slopes based on main kinematic parameters in both groups of elite (RE) and amateur (RA) marathon runners. All subjects performed various tests on a treadmill at 0, 2, and 7% slopes at different speeds: 3.89, 4.17, 4.44, 4.72, and 5.00 m.s. A high speed digital camera, 210 Hz, has been used to record; Dartfish 5.5Pro has been used to perform a 2D video analysis. Step length (SL), step frequency (SF), flight time (FT), and contact time (CT) were determined and used for comparison. SL, SF, and FT parameters increased, and CT parameter decreased as speed increased. As slopes increased, SL and FT decreased and SF increased in both groups and only CT decreased in RE, whereas in RA, it increased. Data were fitted to the linear regression line (R > 0.95). The 2 groups were significantly different (p < 0.05) in FT, SL, and SF at all speeds in level running. A significant difference between the 2 groups was found in FT at 2 and 7% slopes at all speeds (p < 0.05). Percentage alterations in all variables were greater in the RA group. In conclusion, the choice of optimum SL and SF, through efficient running can be maintained, is influenced not only by speed but also by slopes. Elite runners perform more efficiently than amateur runners who have less experience. LA - English DB - MTMT ER - TY - JOUR AU - Padulo, J AU - Annino, G AU - Smith, L AU - Migliaccio, GM AU - Camino, R AU - Tihanyi, József AU - D'Ottavio, S TI - Uphill Running at Iso-Efficiency Speed JF - INTERNATIONAL JOURNAL OF SPORTS MEDICINE J2 - INT J SPORTS MED VL - 33 PY - 2012 IS - 10 SP - 819 EP - 823 PG - 5 SN - 0172-4622 DO - 10.1055/s-0032-1311588 UR - https://m2.mtmt.hu/api/publication/2018289 ID - 2018289 AB - The purpose of this study was to investigate the effects of slopes (0%, 2% and 7%) on temporal gait kinematics during running at iso-efficiency speed (IES). 65 male marathon runners were selected for this study. A single digital camera (210 Hz) was used to record motion; Dartfish5.5Pro was used to perform 2-dimensional (2D) video analysis and heart rate was recorded during the test. The parameters considered in this study were: step length (SL), flight time (FT), step frequency (SF), contact time (CT) and heart rate (HR). The results showed SL, FT and SF decreased as a result of the increasing treadmill gradient; SL=[(0-2%=8.38%, p<0.0001), (0-7%=23.61%, p<0.0001)]; FT=[(0-2%=8.92%, p<0.02), (0-7%=23.40%, p<0.0001)]; SF=[(0-2%=1.18%), (0-7%=4.02%, p<0.001)]. The CT and HR however increased with the increasing gradient CT=[(0-2%=9.06% p<0.0001), (0-7%=25.64%, p<0.0001)]; HR=[(0-2%=1.65%), (0-7%=3.58%)]. These results show a different trend of the footstep's kinematic parameters when running on a slope at IES. Moreover, we can calculate the optimal run speed on a slope without increasing the metabolic demand. LA - English DB - MTMT ER - TY - JOUR AU - Di Giminiani, R AU - Tihanyi, József AU - Sáfár, Sándor AU - Scrimaglio, R TI - The effects of vibration on explosive and reactive strength when applying individualized vibration frequencies JF - JOURNAL OF SPORTS SCIENCES J2 - J SPORT SCI VL - 27 PY - 2009 IS - 2 SP - 169 EP - 177 PG - 9 SN - 0264-0414 DO - 10.1080/02640410802495344 UR - https://m2.mtmt.hu/api/publication/1306865 ID - 1306865 N1 - Megjegyzés-20899041 UR: http://www.scopus.com/inward/record.url?eid=2-s2.0-58949088642&partnerID=40&md5=e5054361c28be9e618f122e9d19742e7 Megjegyzés-20899180 UR: http://www.scopus.com/inward/record.url?eid=2-s2.0-58949088642&partnerID=40&md5=e5054361c28be9e618f122e9d19742e7 Megjegyzés-20898973 UR: http://www.scopus.com/inward/record.url?eid=2-s2.0-58949088642&partnerID=40&md5=e5054361c28be9e618f122e9d19742e7 LA - English DB - MTMT ER - TY - JOUR AU - Bosco, C AU - Colli, R AU - Introini, E AU - Cardinale, M AU - Tsarpela, O AU - Madella, A AU - Tihanyi, József AU - Viru, A TI - Adaptive responses of human skeletal muscle to vibration exposure JF - CLINICAL PHYSIOLOGY J2 - CLIN PHYSIOL VL - 19 PY - 1999 IS - 2 SP - 183 EP - 187 PG - 5 SN - 0144-5979 DO - 10.1046/j.1365-2281.1999.00155.x UR - https://m2.mtmt.hu/api/publication/1306625 ID - 1306625 N1 - http://search.ebscohost.com/login.aspx?direct=true&db=s3h&AN=5302713&site=ehost-live Megjegyzés-21930501 Z9: 153 AB - The aim of this study was to investigate the effects of whole-body vibrations (WBV) on the mechanical behaviour of human skeletal muscle. For this purpose, six female volleyball players at national level were recruited voluntarily. They were tested with maximal dynamic leg press exercise on a slide machine with extra loads of 70, 90, 110 and 130 kg. After the testing, one leg was randomly assigned to the control treatment (C) and the other to the experimental treatment (E) consisting of vibrations. The subjects were then retested at the end of the treatment using the leg press. Results showed remarkable and statistically significant enhancement of the experimental treatment in average velocity (AV), average force (AF) and average power (AP) (P < 0.05-0.005). Consequently, the velocity-force and power-force relationship shifted to the right after the treatment. In conclusion, it was affirmed that the enhancement could be caused by neural factors, as athletes were well accustomed to the leg press exercise and the learning effect was minimized. LA - English DB - MTMT ER -