Spatiotemporal Parameters of 100-m Sprint in Different Levels of Sprinters with Unilateral Transtibial Amputation

Hobara, Hiroaki; Hashizume, Satoru; Kobayashi, Yoshiyuki; Mochmaru, Masaaki

doi:10.1371/journal.pone.0163712

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…This study was laid out as an observational research design. We obtained the movie data during competitive races from publicly available television and internet broadcasts [18,23–25]. We conducted intra-athlete and inter-group comparisons to answer the research questions.…”

Section: Methodsmentioning

confidence: 99%

Intra-athlete and inter-group comparisons: Running pace and step characteristics of elite athletes in the 400-m hurdles

Otsuka

Isaka

2019

PLoS ONE

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The aim of this study was to investigate the running pace and step characteristics among various competitive-level 400-m hurdlers through inter-group and intra-athlete comparisons. We analysed spatiotemporal data involving the split time, mean step length (SL) and mean step frequency (SF) for 13 male world-class and 14 male national-level 400-m hurdlers. We analysed 16.5 ± 3.9 races for each world-class hurdler and 19.8 ± 6.0 races for each national-level hurdler (the total number of analysed runs was 491) using publicly available television and internet broadcasts. Inter-group comparisons showed that both first- and latter-halves split times of the world-class hurdlers were significantly shorter than those of the national-level hurdlers. In the latter-half phase, no significant differences of SL and SF were observed between the world-class and national level hurdlers. Intra-athlete comparisons showed that no athletes favoured only first-half phase in terms of running speed in short finish times. In contrast, finish times of all hurdlers were sensitive to running speed in the latter-half phase. In the latter half of the race, 18 of the 27 hurdlers were identified as being SF reliant during speed enhancements; running speed of the other 9 hurdlers were also sensitive to high SF. In conclusions, important findings regarding high performance in inter-group comparisons do not always corresponded with those in intra-athlete comparisons. All athletes and coaches should first prioritize maintaining high running speeds in the latter half of 400-m hurdles rather than in the first half of the race.

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Section: Methodsmentioning

confidence: 99%

Intra-athlete and inter-group comparisons: Running pace and step characteristics of elite athletes in the 400-m hurdles

Otsuka

Isaka

2019

PLoS ONE

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show abstract

“…This study was laid out as an observational research design. We obtained the movie data during competitive races from publicly available television and internet broadcasts [8,21-23]. We conducted cross-sectional and longitudinal research approaches to answer the research questions.…”

Section: Methodsmentioning

confidence: 99%

“…We disregarded individual races in which the hurdler clearly eased off before the finish line from the analysis. A total of 16.8 ± 4.2 races for each world-class hurdler and 20.0 ± 6.0 races for each national-level hurdler were analysed by publicly available Internet broadcasts [8,21–23]; so the total number of the analysed runs was 499. The research procedures complied with the companies’ terms and conditions for all websites and broadcasts used in this study.…”

Section: Methodsmentioning

confidence: 99%

Cross-sectional and longitudinal research approaches: running pace and step characteristics of elite athletes in the 400-m hurdles

Otsuka

Isaka

2018

Preprint

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The aim of this study was to clarify the running pace and step characteristics among various competitive-level 400-m hurdlers through cross-sectional and longitudinal research approaches. We analysed spatiotemporal data for 13 male world-class and 14 male national-level 400-m hurdlers. We analysed 16.8 ± 4.2 races for each world-class hurdler and 20.0 ± 6.0 races for each national-level hurdler (the total number of analysed runs was 499) using publicly available television and internet broadcasts. Cross-sectional approach showed that positive relationships of finish time were highly obtained between both first- (r = 0.901) and latter-half split times (r = 0.914). In contrast, the first- and latter-half split times were not significantly correlated to SL and SF. A multiple single-subject approach showed that 14/27 hurdlers were identified as being latter-half speed reliant. In contrast, no hurdlers demonstrated first-half reliance. In the latter half of the race, 12/27 hurdlers were identified as being SF reliant; no hurdlers demonstrated SL reliance. In conclusions, important findings regarding high performance in a cross-sectional research approach do not always corresponded with those in a longitudinal research approach. Athletes and coaches should carefully improve performance in the first half of the race based on an individualization principle for training.

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Individual Step Characteristics During Sprinting in Unilateral Transtibial Amputees

Hobara

Saito

Hashizume

et al. 2018

Journal of Applied Biomechanics

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To understand the step characteristics during sprinting in lower-extremity amputees using running-specific prosthesis, each athlete should be investigated individually. Theoretically, sprint performance in a 100-m sprint is determined by both step frequency and step length. The aim of the present study was to investigate how step frequency and step length correlate with sprinting performance in elite unilateral transtibial amputees. By using publicly-available Internet broadcasts, the authors analyzed 88 races from 7 unilateral transtibial amputees. For each sprinter's run, the average step frequency and step length were calculated using the number of steps and official race time. Based on Pearson's correlation coefficients between step frequency, step length, and official race time for each individual, the authors classified each individual into 3 groups: step-frequency reliant, step-length reliant, and hybrid. It was found that 2, 2, and 3 sprinters were classified into step-frequency reliant, step-length reliant, and hybrid, respectively. These results suggest that the step frequency or step length reliance during a 100-m sprint is an individual occurrence in elite unilateral transtibial amputees using running-specific prosthesis.

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Spatiotemporal Parameters of 100-m Sprint in Different Levels of Sprinters with Unilateral Transtibial Amputation

Cited by 3 publications

References 19 publications

Intra-athlete and inter-group comparisons: Running pace and step characteristics of elite athletes in the 400-m hurdles

Intra-athlete and inter-group comparisons: Running pace and step characteristics of elite athletes in the 400-m hurdles

Cross-sectional and longitudinal research approaches: running pace and step characteristics of elite athletes in the 400-m hurdles

Individual Step Characteristics During Sprinting in Unilateral Transtibial Amputees

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