@article{MTMT:2018288, title = {Footstep analysis at different slopes and speeds in elite race walking}, url = {https://m2.mtmt.hu/api/publication/2018288}, author = {Padulo, J and Annino, G and D'ottavio, S and Vernillo, G and Smith, L and Migliaccio, GM and Tihanyi, József}, doi = {10.1519/JSC.0b013e3182541eb3}, journal-iso = {J STRENGTH CONDIT RES}, journal = {JOURNAL OF STRENGTH AND CONDITIONING RESEARCH}, volume = {27}, unique-id = {2018288}, issn = {1064-8011}, abstract = {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.}, year = {2013}, eissn = {1533-4287}, pages = {125-129} } @article{MTMT:2334186, title = {The interaction between body position and vibration frequency on acute response to whole body vibration}, url = {https://m2.mtmt.hu/api/publication/2334186}, author = {R, Di Giminiani and F, Masedu and Tihanyi, József and R, Scrimaglio and M, Valenti}, doi = {10.1016/j.jelekin.2012.08.018}, journal-iso = {J ELECTROMYOGR KINES}, journal = {JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY}, volume = {23}, unique-id = {2334186}, issn = {1050-6411}, abstract = {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.}, keywords = {Adult; Male; ARTICLE; human; priority journal; normal human; human experiment; Posture; motor performance; VIBRATION; electromyogram; muscle isometric contraction; whole body vibration; vastus lateralis muscle; leg muscles; gastrocnemius muscle; body position; Vibration variables; Electromyographic activity}, year = {2013}, eissn = {1873-5711}, pages = {245-251} } @article{MTMT:1848204, title = {Kinematics of Running at Different Slopes and Speeds}, url = {https://m2.mtmt.hu/api/publication/1848204}, author = {Padulo, J and Annino, G and Migliaccio, GM and D'Ottavio, S and Tihanyi, József}, doi = {10.1519/JSC.0b013e318231aafa}, journal-iso = {J STRENGTH CONDIT RES}, journal = {JOURNAL OF STRENGTH AND CONDITIONING RESEARCH}, volume = {26}, unique-id = {1848204}, issn = {1064-8011}, abstract = {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.}, year = {2012}, eissn = {1533-4287}, pages = {1331-1339} } @article{MTMT:2018289, title = {Uphill Running at Iso-Efficiency Speed}, url = {https://m2.mtmt.hu/api/publication/2018289}, author = {Padulo, J and Annino, G and Smith, L and Migliaccio, GM and Camino, R and Tihanyi, József and D'Ottavio, S}, doi = {10.1055/s-0032-1311588}, journal-iso = {INT J SPORTS MED}, journal = {INTERNATIONAL JOURNAL OF SPORTS MEDICINE}, volume = {33}, unique-id = {2018289}, issn = {0172-4622}, abstract = {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.}, year = {2012}, eissn = {1439-3964}, pages = {819-823} } @article{MTMT:1306865, title = {The effects of vibration on explosive and reactive strength when applying individualized vibration frequencies}, url = {https://m2.mtmt.hu/api/publication/1306865}, author = {Di Giminiani, R and Tihanyi, József and Sáfár, Sándor and Scrimaglio, R}, doi = {10.1080/02640410802495344}, journal-iso = {J SPORT SCI}, journal = {JOURNAL OF SPORTS SCIENCES}, volume = {27}, unique-id = {1306865}, issn = {0264-0414}, year = {2009}, eissn = {1466-447X}, pages = {169-177} } @article{MTMT:1306625, title = {Adaptive responses of human skeletal muscle to vibration exposure}, url = {https://m2.mtmt.hu/api/publication/1306625}, author = {Bosco, C and Colli, R and Introini, E and Cardinale, M and Tsarpela, O and Madella, A and Tihanyi, József and Viru, A}, doi = {10.1046/j.1365-2281.1999.00155.x}, journal-iso = {CLIN PHYSIOL}, journal = {CLINICAL PHYSIOLOGY}, volume = {19}, unique-id = {1306625}, issn = {0144-5979}, abstract = {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.}, year = {1999}, eissn = {1365-2281}, pages = {183-187} }