Arm-Stroke Descriptor Variability during 200-m Front Crawl Swimming.
Arm-Stroke Descriptor Variability during 200-m Front Crawl Swimming.
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DOI：
10.3390/s21020324
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发表时间：
2021-01-06
期刊：
影响因子：
--
通讯作者：
Gatta G
中科院分区：
文献类型：
--
作者：
Cortesi M;Di Michele R;Fantozzi S;Bartolomei S;Gatta G
本研究利用IMMU研究了中长距离游泳比赛中臂划时间描述符在圈间和圈内的变异性。8名男子游泳运动员进行了最大200米前爬泳，通过IMMU的5个单位测量了速度、划线率、划水阶段持续时间和手臂协调指数的圈间和圈内变异性。该算法利用上臂生物力学模型的IMMU方向和运动链计算腕关节的三维坐标，并识别出四个手臂行程阶段的起始事件。速度和心搏率的平均值分别为1.4 7±0.10 m·m in−1和32.94±4.84次·m in−1，并在2 0 0 m处显著降低(p<；0.001；η2=0.80和0.47)。每圈结束时的冲刺率明显低于起跑和中段(p<；0.05；η2=0.55)。没有检测到其他显著的圈间和圈内差异。两个主要发现是：(I)IMMUS技术可以有效地在游泳试验期间持续监测时间描述符；(Ii)游泳运动员在中长跑项目中能够保持其时间技术描述符的稳定，尽管速度和划泳率有所下降。
The present study aimed to explore the variability of the arm-stroke temporal descriptors between and within laps during middle-distance swimming event using IMMUs. Eight male swimmers performed a 200-m maximum front-crawl in which the inter-lap and intra-lap variability of velocity, stroke rate, stroke-phases duration and arm-coordination index were measured through five units of IMMU. An algorithm computes the 3D coordinates of the wrist by means the IMMU orientation and the kinematic chain of upper arm biomechanical model, and it recognizes the start events of the four arm-stroke phases. Velocity and stroke rate had a mean value of 1.47 ± 0.10 m·s−1 and 32.94 ± 4.84 cycles·min−1, respectively, and a significant decrease along the 200-m (p < 0.001; η2 = 0.80 and 0.47). The end of each lap showed significantly lower stroke rate compared to the start and the middle segment (p < 0.05; η2 = 0.55). No other significant inter-lap and intra-lap differences were detected. The two main findings are: (i) IMMUs technology can be an effective solution to continuously monitor the temporal descriptors during the swimming trial; (ii) swimmers are able to keep stable their temporal technique descriptors in a middle-distance event, despite the decrease of velocity and stroke rate.
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影响因子：
1.4
作者：
Escobar, David Simbana;Hellard, Philippe;Seifert, Ludovic
通讯作者：
Seifert, Ludovic
影响因子：
3.4
作者：
Hellard, P.;Dekerle, J.;Hausswirth, C.
通讯作者：
Hausswirth, C.
影响因子：
2.5
作者：
Seifert, L;Boulesteix, L;Chollet, D
通讯作者：
Chollet, D
DOI：
10.3390/s16010018
发表时间：
2015-12-25
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
Mooney R;Corley G;Godfrey A;Quinlan LR;ÓLaighin G
通讯作者：
ÓLaighin G
影响因子：
3.4
作者：
Veiga, Santiago;Roig, Andreu
通讯作者：
Roig, Andreu