Effects of two exercise programmes on joint position sense, dynamic balance and countermovement jump in male amateur football players. A randomised controlled trial
JOURNAL OF SPORTS SCIENCES
Authors: Navarro-Santana, Marcos J.; Asin-Izquierdo, Ivan; Gomez-Chiguano, Guido F.; Albert-Lucena, Daniel; Plaza-Manzano, Gustavo; Perez-Silvestre, Angel
Abstract
Introduction The injury prevention and warm-up exercises programmes improve physical performance and injury ratio, but it is poorly investigated in amateur football. Objectives To assess the effects of two warm-up multi-station programmes (IAI-Programme and FIFA11+) through JPS, LSDT and CMJ. Study design: Randomised controlled trial. Methods 36 football players were randomised into 2 groups: IAI-Programme (n = 18) and FIFA11+ (n = 18) and performed the intervention protocol for 6 weeks. JPS, LSDT and CMJ were measured at baseline, after 6, 10 and 18 weeks (from baseline). The inter-group and intra-group differences were assessed by repeated-measures analysis of variance test (ANOVA). Results Significant differences between groups were found after 18 weeks in the absolute angular error (-2.18[-4.33,-0.047], d = 0.69, p < 0.05) of the JPS and in the CMJ (p = 0.001, LATIN SMALL LETTER ENG(2)p=,0.298) in favour of IAI-Programme when compared to FIFA11 +. No significant differences between groups were found in the LSDT. There were also intra-group differences observed in the LSDT in both groups. Conclusions IAI-Programme can provide sensitive benefits with respect to the proprioceptive ability of knee flexion and CMJ than FIFA11 +. Both IAI-Programme and FIFA11+ present improvements in the dynamic postural control measured by the LSDT.
Response to the discussion by Montewka Jaku, Gil Mateusz and Wr.obel Krzysztof on the article by Zhang & Meng entitled "Probabilistic ship domain with applications to ship collision risk assessment [Ocean Eng. 186 (2019) 106130]
OCEAN ENGINEERING
Authors: Zhang, Liye; Meng, Qiang
Abstract
This note aims to address the concerns and confusions raised by Jakub et al. (2020) on the article of Zhang and Meng published in Ocean Engineering in 2019. Zhang and Meng (2019) mainly proposed the probabilistic ship domain to capture the diverse navigational behaviors of captains based on the big AIS data with less emphasies on how to assess ship collision risk using the probabilistic ship domain. To achieve of the aim, we first examine two concepts of ideal ship domain and practical ship domain. We proceed to investigate the relationship between ship domain and ship collision risk using field data from restricted water in both Singapore strait and fairway. We finally discuss the onboard collision detection by using the probabilistic ship domain incorporating with the Closest Point of Approach (CPA). This note not only clarifies some confusions or misunderstandings of the applicaion of probabilistic ship domain for ship collision risk assessment bust also exhibits the values and merits of the probabilistic ship domain.