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| Author | Liebermann, D.G.; Katz, L.; Hughes, M.D.; Bartlett, R.M.; McClements, J.; Franks, I.M. | ||||
| Title | Advances in the application of information technology to sport performance | Type | Journal Article | ||
Year  |
2002 | Publication | Journal of Sports Sciences | Abbreviated Journal | J Sports Sci |
| Volume | 20 | Issue | 10 | Pages | 755-769 |
| Keywords | *Biofeedback, Psychology; *Computer Simulation; Humans; Models, Biological; Physical Education and Training/*methods; Psychomotor Performance/physiology; Sports Medicine/methods; *Task Performance and Analysis; Videotape Recording | ||||
| Abstract | This paper overviews the diverse information technologies that are used to provide athletes with relevant feedback. Examples taken from various sports are used to illustrate selected applications of technology-based feedback. Several feedback systems are discussed, including vision, audition and proprioception. Each technology described here is based on the assumption that feedback would eventually enhance skill acquisition and sport performance and, as such, its usefulness to athletes and coaches in training is critically evaluated. | ||||
| Address | Department of Physical Therapy, Sackler Faculty of Medicine, University of Tel Aviv, Israel | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0264-0414 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:12363293 | Approved | no | ||
| Call Number | Serial | 40 | |||
| Permanent link to this record | |||||
| Author | Dario G. Liebermann; Murray E. Maitland; Larry Katz | ||||
| Title | Lower-limb extension power: How well does it predict short distance speed skating performance? | Type | Journal Article | ||
| Year |
2002 | Publication | Isokinetics and Exercise Science | Abbreviated Journal | |
| Volume | 10 | Issue | 2 | Pages | 87-95 |
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| Abstract | This study was aimed to explore the relationship between lower limb extension power measured by isokinetic knee extensions (IK) and vertical jumps performed on a force plate (VJ) and speed skating (SS) sprint power measured by a laser device. Methods: Twenty elite short- and long-track speed skaters performed 100 m sprints followed by VJ and IK trials. Power-time curves were calculated off-line. Pearson correlation coefficients were used to determine the degree of association between the variables. Results: SS sprint power correlates strongly with VJ power (r=0.870; p<0.001) while IK power showed a weaker but significant correlation to both (r=0.707 and r=0.706, respectively; p<0.01). As expected, SS times at 15 m and 100 m were inversely associated with SS sprint power (r=-0.818 and r=-0.909; p<0.001) and VJ power (r=-0.730 and r=-0.763; p<0.001), and to a lesser degree with IK power (r=-0.602; r=-0.618; p<0.01). Conclusion: The analyses differentiate between methods of estimating power in speed skaters, and show a strong relationship between initial SS performance and muscular power. Given that 100 m split times strongly relate to final 500 m results (r=0.972; p<0.001, N=332), it is reasonable to believe that an initial power and a stable peak speed before the first curve may lead to achieving the winning edge in short SS events. A finding of particular interest is that isokinetic power results are correlated significantly with the practical outcomes of the performance in spite of the high specificity of the isokinetic testing method. |
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| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 62 | |||
| Permanent link to this record | |||||
| Author | Hoffman, J.R.; Liebermann, D.; Gusis, A. | ||||
| Title | Relationship of leg strength and power to ground reaction forces in both experienced and novice jump trained personnel | Type | Journal Article | ||
| Year |
1997 | Publication | Aviation, Space, and Environmental Medicine | Abbreviated Journal | Aviat Space Environ Med |
| Volume | 68 | Issue | 8 | Pages | 710-714 |
| Keywords | *Aerospace Medicine; *Aviation; Biomechanics; Humans; Leg/*physiology; Male; Military Personnel/*education; *Physical Education and Training; Physical Fitness/*physiology; Range of Motion, Articular; Wounds and Injuries/etiology/*prevention & control | ||||
| Abstract | METHODS: There were 14 male soldiers who participated in this study examining the relationship of leg strength and power on landing performance. Subjects were separated into two groups. The first group (E, n = 7) were parachute training instructors and highly experienced in parachute jumping. The second group of subjects (N, n = 7) had no prior parachute training experience and were considered novice jumpers. All subjects were tested for one-repetition maximum (1 RM) squat strength and maximal jump power. Ground reaction forces (GRF) and the time to peak force (TPF) at landing were measured from jumps at four different heights (95 cm, 120 cm, 145 cm, and 170 cm). All jumps were performed from a customized jump platform onto a force plate. RESULTS: No differences were seen between E and N in either IRM squat strength or in MJP. In addition, no differences were seen between the groups for time to peak force at any jump height. However, significantly greater GRF were observed in E compared to N. Moderate to high correlations between maximal jump power and GRF (r values ranging from 0.62-0.93) were observed in E. Although maximal jump power and the TPF was significantly correlated (r = -0.89) at only 120 cm for E, it was interesting to note that the correlations between MJP and the time to peak force in E were all negative and that the correlations between these variables in N were all positive. CONCLUSIONS: These results suggest that experienced parachutists may use a different landing strategy than novice jumpers. This difference may be reflected by differences in GRF generated during impact and a more efficient utilization of muscle power during the impact phase of the landing. | ||||
| Address | Aeromedical Center, Physiological Training Unit, Israel Air Force, Israel | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0095-6562 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:9262813 | Approved | no | ||
| Call Number | Serial | 60 | |||
| Permanent link to this record | |||||
| Author | Liebermann, D.G.; Issurin V. | ||||
| Title | Effects of vibratory stimulation on the perception of effort during isotonic contractions | Type | Journal Article | ||
| Year |
1997 | Publication | Journal of Human Movement Studies | Abbreviated Journal | |
| Volume | 32 | Issue | Pages | 171-186 | |
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| Notes | Approved | no | |||
| Call Number | Serial | 61 | |||
| Permanent link to this record | |||||
| Author | Falk, B.; Eliakim, A.; Dotan, R.; Liebermann, D.G.; Regev, R.; Bar-Or, O. | ||||
| Title | Birth weight and physical ability in 5- to 8-yr-old healthy children born prematurely | Type | Journal Article | ||
| Year |
1997 | Publication | Medicine and Science in Sports and Exercise | Abbreviated Journal | Med Sci Sports Exerc |
| Volume | 29 | Issue | 9 | Pages | 1124-1130 |
| Keywords | *Birth Weight; Child; Child Development/physiology; Child, Preschool; Female; Follow-Up Studies; Humans; Infant, Newborn; *Infant, Premature; Male; *Motor Skills; *Physical Fitness | ||||
| Abstract | Recent advances in perinatal care have resulted in increased survival rates of extremely small and immature newborns. This has resulted in some neurodevelopmental impairment. The purpose of this study was to quantitatively evaluate and compare neuromuscular performance in children born prematurely at various levels of subnormal birth weight (BW). Subjects were 5- to 8-yr-old children born prematurely at different levels of subnormal BW (535-1760 g, N = 22, PM), and age-matched controls born at full term (> 2500 g, N = 15, CON). None of the subjects had any clinically defined neuromuscular disabilities. Body mass (BM) of PM was lower than that of CON (18.3 +/- 2.7 vs 21.7 +/- 3.8 kg) with no difference in height or sum of 4 skinfolds. Peak mechanical power output determined with a 15-s modified Wingate Anaerobic Test and corrected for BM was lower (P = 0.07) in PM than in CON (5.11 +/- 1.07 vs 5.94 +/- 1.00 W.kg-1). This was especially noticeable in children born at extremely low BW (ELBW, < 1000 g, 4.49 +/- 1.04 W.kg-1, P < 0.01). Peak power, determined in a force-plate vertical jump, corrected for BM was lower in PM vs CON (25.5 +/- 5.4 vs 30.8 +/- 5.2 W.kg-1, respectively P = 0.01), especially in the ELBW group (20.0 +/- 5.5 W.kg-1). Similarly, the elapsed time between peak velocity and actual jump take-off was longer in PM than in CON (41.2 +/- 9.4 vs 35.8 +/- 5.8 ms, respectively, P = 0.04). No differences were observed in peak force. The results suggest that performance deficiencies of prematurely-born children may be a result of inferior inter-muscular coordination. The precise neuromotor factors responsible for this should be identified by future research. | ||||
| Address | Ribstein Center for Research and Sport Medicine Sciences, Wingate Institute, Netanya, Israel. bfalk@ccsg.tau.ac.il | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0195-9131 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:9309621 | Approved | no | ||
| Call Number | Serial | 64 | |||
| Permanent link to this record | |||||