||The Discrimination of Barbell Weight for Weightlifters
||Institute of Physical Education, Health & Leisure Studies
relative barbell mass
本研究招募十二位大學舉重隊運動員與十四位大學健訓社學生做為受試者，進行槓鈴重量辨識測驗。標準重量(Ws)訂為個人的最佳抓舉(舉重隊)或硬舉(健訓社)記錄的80%，七個測試重量(Wt)分別為Ws, Ws±1kg, Ws±2kg, and Ws±5kg。在受試者連續提起標準重量與測試重量的槓鈴數次後，需回答該組測試重量與標準重量的比較結果。每位受試者的試舉次數與各測試重量的答對率皆進行統計分析。研究結果發現，當測試重量與標準重量差異為±5kg時，舉重隊運動員答對率超過84%。當測試重量與標準重量相同時，答對率為38%，顯著較其他各測試重量低(p<.01)。舉重隊與健訓社的重量辨識答對率沒有顯著差異，但舉重隊的試舉次數顯著較少(p<.001)。根據分析結果，健訓社同學在增加足夠的試舉次數後，可達到與受過多年訓練的舉重運動員相近的槓鈴重量辨識能力。此外，舉重運動員的槓鈴重量辨識的差異閾值應為5公斤，當重量差異小於2公斤時，即無法正確辨識。
Twelve college weightlifters (WL group) and fourteen weight training club members (WT group) were recruited in this study. The standard barbell weight of each participant was set at 80% of personal best snatch/ deadlift record. The test barbell weights that include Ws, Ws±1kg, Ws±2kg, and Ws±5kg were given randomly. After each lifter performed several lifts of the standard weight firstly followed by the test weight, the lifter was asked to identify the weight difference between the two barbells. Correct percentage of each comparison was analyzed. The results showed that the correct percentage of barbell weight discrimination for the weightlifters was over 84% when the test weight was Ws±5kg. Under the test weight equal to the standard weight, the correct percentage was significantly decreased to 38% and less than that of other test weights (p<.01). There was no significant difference in correct percentage of discrimination between the WL and WT group, however, the WL group performed significant less lifts than those of the WT group (p<0.01). These results suggest that the discrimination of barbell weight for the weight-training club members could be similar to the experienced weightlifters when increasing the lifts enough. In conclusion, the barbell weight discrimination threshold seemed to have been close to 5 kg for the lifters. Actually, the lifters could not be aware of the slight difference (ex: less than 2kg) between two barbell weights.
List of Tables vi
List of Figures vii
Chapter 1 Introduction 1
1.1 Background 1
1.2 The kinematics of snatch 2
1.3 The mechanisms of weight discrimination 3
1.4 The weight difference threshold of the finger-lifting weight 4
1.5 Purposes 5
Chapter 2 Materials and Methods 6
2.1 Participants 6
2.2 Protocol and Procedure 6
2.3 Statistical analyses 8
Chapter 3 Results 9
3.1 The correct percentage of discrimination between groups 9
3.2 The numbers of lift between groups 10
3.3 The barbell weight discrimination under heavier test weight for weightlifters 13
3.4 The barbell weight discrimination for weightlifters in different skill group 14
Chapter 4 Discussion 18
Chapter 5 Conclusion 24
Appendix A: Informed consent 28
Appendix B: The barbell weight discrimination under 80% Ws for weightlifting group 32
Appendix C: The barbell weight discrimination under 80% Ws for weight-training group 33
Appendix D: The barbell weight discrimination under 90% Ws for weightlifting group 34
Akkus, H. (2012). Kinematic analysis of the snatch lift with elite female weightlifters during the 2010 World Weightlifting Championship. The Journal of Strength & Conditioning Research, 26(4), 897-905.
Bergmann Tiest, W. M., & Kappers, A. M. L. (2016). Haptic Perception of Force. Scholarpedia of Touch, 217-225. doi: 10.2991/978-94-6239-133-8_17
Brodie, E. E., & Ross, H. E. (1984). Sensorimotor mechanisms in weight discrimination. Perception & Psychophysics, 36(5), 477-481.
Buckingham, G. (2014). Getting a grip on heaviness perception: a review of weight illusions and their probable causes. Exp Brain Res, 232(6), 1623-1629. doi: 10.1007/s00221-014-3926-9
Buckingham, G., Byrne, C. M., Paciocco, J., van Eimeren, L., & Goodale, M. A. (2014). Weightlifting exercise and the size-weight illusion. Atten Percept Psychophys, 76(2), 452-459. doi: 10.3758/s13414-013-0597-8
Campos, J., Poletaev, P., Cuesta, A., Pablos, C., & Carratalá, V. (2006). Kinematical analysis of the snatch in elite male junior weightlifters of different weight categories. The Journal of Strength & Conditioning Research, 20(4), 843-850.
Chiu, H.-T., & Kung, C.-Y. (2014). Snatch movements of an elite Taiwanese female weightlifter under lifting different barbell mass. Abstract in 7th World Congress of Biomechanics, (poster F306), p1738.
Chiu, H.-T., Liang, J.-L., & Wu, Z.-F. (2009). The Characteristics of the Barbell Movements during Snatch for Young Female Weightlifters. Chinese Journal of Sports Biomechanics(1), 23-31.
Chiu, H.-T., Wang, C.-H., & Cheng, K. B. (2010). The three-dimensional kinematics of a barbell during the snatch of Taiwanese weightlifters. The Journal of Strength & Conditioning Research, 24(6), 1520-1526.
Chouinard, P. A., Large, M. E., Chang, E. C., & Goodale, M. A. (2009). Dissociable neural mechanisms for determining the perceived heaviness of objects and the predicted weight of objects during lifting: an fMRI investigation of the size-weight illusion. Neuroimage, 44(1), 200-212. doi: 10.1016/j.neuroimage.2008.08.023
Dijker, A. J. (2014). The role of expectancies in the size-weight illusion: a review of theoretical and empirical arguments and a new explanation. Psychon Bull Rev, 21(6), 1404-1414. doi: 10.3758/s13423-014-0634-1
Ekman, G. (1959). Weber's Law and Related Functions. The Journal of Psychology, 47(2), 343-352. doi: 10.1080/00223980.1959.9916336
Garhammer, J., & Takano, B. (2003). Training for weightlifting. In P. V. Komi (Ed.), Strength and power in sport (Second ed., pp. 502-515). UK: Blackwell Science.
Gourgoulis, V., Aggeloussis, N., Garas, A., & Mavromatis, G. (2009). Unsuccessful vs. successful performance in snatch lifts: a kinematic approach. The Journal of Strength & Conditioning Research, 23(2), 486-494.
Hadi, G., Akkus, H., & Harbili, E. (2012). Three-dimensional kinematic analysis of the snatch technique for lifting different barbell weights. The Journal of Strength & Conditioning Research, 26(6), 1568-1576.
Hajnal, A., Fonseca, S., Harrison, S., Kinsella-Shaw, J., & Carello, C. (2007). Comparison of dynamic (effortful) touch by hand and foot. J Mot Behav, 39(2), 82-88. doi: 10.3200/JMBR.39.2.82-88
Hajnal, A., Fonseca, S., Kinsella-Shaw, J. M., Silva, P., Carello, C., & Turvey, M. T. (2007). Haptic selective attention by foot and by hand. Neurosci Lett, 419(1), 5-9. doi: 10.1016/j.neulet.2007.03.042
Harbili, E. (2012). A gender-based kinematic and kinetic analysis of the snatch lift in elite weightlifters in 69-kg category. J Sports Sci Med, 11(1), 162.
Holmin, J. S., & Norman, J. F. (2012). Aging and weight-ratio perception. PLoS One, 7(10), e47701. doi: 10.1371/journal.pone.0047701
Huang, J., Tanino, T., Wada, K., & Tomokuni, N. (2012). Measurement of the relationship between weight perception and upper limb movement. Paper presented at the Robotics and Biomimetics (ROBIO), 2012 IEEE International Conference on.
Ikeda, Y., Jinji, T., Matsubayashi, T., Matsuo, A., Inagaki, E., Takemata, T., & Kikuta, M. (2012). Comparison of the snatch technique for female weightlifters at the 2008 Asian Championships. The Journal of Strength & Conditioning Research, 26(5), 1281-1295.
Kung, C.-Y. (2014). Establishment of the snatch motion model for the elite female weightlifters in Taiwan. Unpublished master's thesis.
Lee, T. H. (2014). Subjective perception of load heaviness. Int J Occup Saf Ergon, 20(3), 421-427. doi: 10.1080/10803548.2014.11077056
Norman, J. F., Norman, H. F., Swindle, J. M., Jennings, L. R., & Bartholomew, A. N. (2009). Aging and the discrimination of object weight. Perception, 38(9), 1347.
Siff, M. C. (2003). Supertraining: Supertraining Institute.
Storey, A., & Smith, H. K. (2012). Unique aspects of competitive weightlifting. Sports Med, 42(9), 769-790.
van Polanen, V., & Davare, M. (2015). Sensorimotor Memory Biases Weight Perception During Object Lifting. Front Hum Neurosci, 9, 700. doi: 10.3389/fnhum.2015.00700
Vassilios, G., Aggeloussis, N., Antoniou, P., Christoforidis, C., Mavromats, G., & Garas, A. (2002). Comparative 3-dimensional kinematic analysis of the snatch technique in elite male and female greek weightlifters. The Journal of Strength & Conditioning Research, 16(3), 359-366.
Wagman, J. B., & Aspel, S. J. (2011). When can an object feel heavier than itself? Perceived heaviness of a wielded object depends on grasp position. Perception, 40(11), 1384-1386.