scholarly journals Effects of age and sex on association between toe muscular strength and vertical jump performance in adolescent populations

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0262100
Author(s):  
Toshiyuki Kurihara ◽  
Masafumi Terada ◽  
Shun Numasawa ◽  
Yuki Kusagawa ◽  
Sumiaki Maeo ◽  
...  
Keyword(s):  
High School ◽  
High School Students ◽  
Junior High School ◽  
Muscular Strength ◽  
Vertical Jump ◽  
Metatarsophalangeal Joint ◽  
The Body ◽  
Childhood And Adolescence ◽  
School Students ◽  
Jump Performance

Toe muscular strength plays an important role in enhancing athletic performance because the forefoot is the only part of the body touching the ground. In general, muscular strength increases with age throughout adolescence, and sex-related difference in muscular strength becomes evident during childhood and adolescence. However, toe muscular strength is known to be levelled off after late adolescence in both sexes. For adolescent populations, therefore, the association of toe muscular strength with physical performance might differ with age and/or sex. This study aimed to investigate differences in relationships between toe muscular strength and vertical jump performance across sex and age in adolescent populations. The maximum isometric strength of the toe muscles and vertical jump height (VJ) were assessed in 479 junior high school students (JH) aged 12–14 years (243 boys and 236 girls) and 465 high school students (HS) aged 15–18 years (265 boys and 200 girls). Two types of measurements were performed to evaluate the toe muscular strength: toe gripping strength (TGS) with the metatarsophalangeal joint in the plantar flexed position and toe push strength (TPS) with the metatarsophalangeal joint in the dorsiflexed position. TGS and TPS were normalized to body weight. Two-way ANOVA showed that TGS had significant main effects of sex (boys > girls) and age (HS > JH) while TPS only had a significant main effect of sex (boys > girls). When the effects of sex and age were separately analyzed, VJ was significantly correlated with TGS in JH girls, HS girls, and JH boys (r = 0.253–0.269, p < 0.05), but not in HS boys (r = 0.062, p = 0.3351). These results suggest that toe muscular strength is relatively weakly associated with vertical jump performance in adolescent boys and girls, but the association would not be established in high school boys.

scholarly journals Assessment of the nutritional habits of junior high school students from the Kłomnice district in relation to obesity/ Ocena nawyków żywieniowych młodzieży gimnazjalnej z gminy Kłomnice w aspekcie występowania otyłości

2017 ◽  
Vol 11 (3) ◽  
pp. 32-39
Author(s):  
Ewa Malczyk ◽  
Marzena Zołoteńka-Synowiec ◽  
Beata Całyniuk ◽  
Marta Misiarz ◽  
Joanna Rybak
Keyword(s):  
High School ◽  
High School Students ◽  
Junior High School ◽  
Junior High ◽  
Eating Habits ◽  
The Body ◽  
Junior High School Students ◽  
School Students ◽  
Nutritional Habits ◽  
Milk And Dairy Products

Background: Puberty is a time when many changes occur in the body of a young person. It is also the time when nutritional habits are developed or modified. Healthy dietary choices are of particular importance for normal development during adolescence and are also predictive of future health. Aim of the study: The aim of this study was to assess the nutritional habits of junior high school students from the Kłomnice district with a focus on obesity. Material and methods: The study was carried out using 280 randomly selected secondary school students attending schools in Kłomnice, Częstochowa in the Silesian province. The research was carried out using a questionnaire comprising questions about gender, age, weight and height of the body and nutritional habits. Results: The nutritional habits of high school students from the Kłomnice district were evaluated to be low. Girls more frequently than boys had developed improper eating habits. Irregularities in the diet of the surveyed high school children are: incorrect number of meals a day, irregular food consumption, snacking between meals, adding too much sugar to hot beverages, infrequent consumption of milk and dairy products, coarse grains, vegetables, fruits and legumes and a high frequency of meat and sweets consumption. The nutritional habits of junior high school students from Kłomnice were at a sufficient level. Girls more often than the boys showed improper eating habits. Irregularities in the diet of the students in the study were: improper amount of food consumed during the day, irregular food consumption, snacking between meals, adding too much sugar to hot beverages, infrequent consumption of milk and dairy products, coarse grains, fish, vegetables, fruits and legumes and a high frequency of meat and sweets consumption. Conclusions: It is recommended that continuous nutritional education of children and adolescents is implemented in order to improve diet and thereby reduce the risk of obesity in the future.

scholarly journals ABSTINENSI SEKSUAL REMAJA SMP DI KOTA TANGERANG SELATAN

2020 ◽  
Vol 11 (2) ◽  
pp. 125-136
Author(s):  
Mizna Sabilla ◽  
Nurfadhilah Nurfadhilah
Keyword(s):  
High School ◽  
High School Students ◽  
Junior High School ◽  
School Environment ◽  
Junior High ◽  
The Body ◽  
Junior High School Students ◽  
Sexual Abstinence ◽  
School Students ◽  
Cross Sectional

Abstract Background: Indonesia is projected to experience the peak of the demographic bonus in 2030. The demographic bonus can turn into a burden if adolescents who are successors are not qualified. Adolescent who are supposed to be 100% absent from sex actually showed an unsatisfactory proportion in several areas. Objective: This study aimed to describe abstinence behavior among adolescents at junior high school in South Tangerang City. Method: This study used a cross sectional design. The study population was junior high school students by selecting 25 junior high schools as the sample. The number of samples were 165 students who were taken incidentally. Data was collected from December 2019 to January 2020 by filling out a questionnaire through interviews. Result: The proportion of abstinence among junior high school students was 80%. The highest abstinence was occurred among adolescent boys and aged 12 years. Most of them carried out positive activities such as art, organization, regular worship, regular exercise, and courses. Most of them admitted that they did not feel seduced, coerced and threatened to have sexual activity. When a sensitive part of the body was touched, respondents acted assertively by refusing, shouting, and hitting. Conclusion: Sexual abstinence among adolescents at junior high school in South Tangerang needs to be increased. Understanding the importance of abstinence needs to be given to adolescents from the onset of puberty by parents, school environment (school organizations and PIKR) and community (religious organizations).   Keywords: Sexual abstinence, Adolescent at Junior High School, South Tangerang     Abstrak Latar belakang: Indonesia akan mengalami puncak bonus demografi pada tahun 2030. Bonus demografi dapat berbalik menjadi beban apabila remaja yang menjadi penerus tidak berkualitas. Remaja yang seharusnya 100 persen absen seks justru menunjukkan proporsi yang tidak menggembirakan di beberapa wilayah. Tujuan: Penelitian ini bertujuan untuk mengetahui gambaran perilaku abstinensi pada remaja usia SMP di Kota Tangerang Selatan. Metode: Penelitian menggunakan desain cross-sectional. Populasi penelitian adalah remaja usia SMP dengan memilih 25 SMP sebagai sampel. Jumlah sampel sebanyak 165 siswa/siswi yang diambil secara insidentil. Pengumpulan data dilakukan pada Desember 2019 sampai Januari 2020 dengan pengisian kuesioner melalui wawancara. Hasil: Proporsi abstinensi seksual remaja SMP sebesar 80 persen. Abstinensi tertinggi dialami oleh remaja laki-laki dan usia 12 tahun. Sebagian besar melakukan kegiatan positif seperti seni, berorganisasi, rutin beribadah, rutin berolahraga, dan mengikuti seminar/kursus. Sebagian besar responden mengaku tidak pernah merasa dirayu, dipaksa dan diancam untuk melakukan aktivitas seksual. Apabila bagian tubuh sensitifnya disentuh responden melakukan tindakan asertif dengan menolak, berteriak, dan memukul. Kesimpulan: Abstinensi seksual remaja SMP di Tangerang Selatan harus ditingkatkan. Orang tua perlu menjaga dan mengawasi pergaulan anaknya. Pemahaman agama dan pentingnya abstinensi perlu diberikan kepada remaja semenjak awal pubertas dari orang tua, lingkungan sekolah dan masyarakat melalui organisasi keagamaan dan PIKR   Kata kunci: Abstinensi seksual, Remaja SMP, Tangerang Selatan

DEVELOPING READING MATERIALS FOR JUNIOR HIGH SCHOOL STUDENTS BASED ON CONTENT AREA

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Anggita Kasanra Lubis And Rafika Dewi Nasution
Keyword(s):  
High School ◽  
High School Students ◽  
Junior High School ◽  
Content Area Reading ◽  
Junior High School Students ◽  
Content Area ◽  
English Teacher ◽  
School Students ◽  
First Semester ◽  
Reading Materials

Reading is the basic in learning every subject. The more understanding the text, the more information students can gain. However, the reading materials that the students use is not appropriate based on syllabus. Therefore, the reading materials should be developed to fulfil the syllabus and the students' needs also. Because English is included Content Area Reading, so the development of reading materials is based on content area which focus on strengthen the vocabularies, specifically the unfamiliar ones, by giving glossary and related pictures. The developed text is only focus in the first semester which is descriptive and recount text. The research was conducted at SMP Muhammadiyah 7 Medan. The data was taken from interviewing the English teacher and distributing questionnaires for 30 students in grade VIII-4. The data showed that students need materials which is related to their environment and constructed by familiar vocabularies. Based on the result of the study, conclusion and suggestion are directed to the English teacher who is teaching in that school to provide reading materials based on syllabus and students' needs regularly.

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