Latar Belakang: Sekarang ini perkembangan teknologi tidak hanya digunakan oleh orang dewasa, tetapi perkembangan teknologi telah digunakan juga dikalangan anak-anak. Salah satu kemajuan teknologi adalah gawai. Salah satu bentuk gawai adalah smartphone. Dampak negatif dari pengunaan gawai yaitu menurunnya fungsi penglihatan, akibat paparan sinar dari layar monitor (LED/LCD) dan penyinaran lainnya. Penelitian ini bertujuan untuk mengetahui gambaran perilaku penggunaan gawai dan kesehatan mata pada anak usia 10-12 tahun. Metode Penelitian: Penelitian ini merupakan studi deskriptif kuantitatif. Populasi dalam penelitian ini adalah siswa SD Negeri 10 Salatiga. Variabel penelitian yang diteliti adalah durasi penggunaan gawai, posisi tubuh saat menggunakan gawai, pemakaian ketika cahaya redup, pemakaian ketika tidak ada cahaya dan kondisi kesehatan mata. Data yang diperoleh dianalisis menggunakan analisis distribusi frekuensi. Hasil: Responden yang menggunakan gawai dalam waktu 2-3 jam/hari sebanyak 45 responden (66,2%). Responden yang menggunakan posisi duduk tegak saat menggunakan gawai sebanyak 37 orang (54,4%). Responden yang tidak pernah menggunakan gawai ketika cahaya redup sebanyak 35 orang (51,5%). Responden dalam penelitian ini menyatakan menggunakan gawai ketika ada cahaya sebanyak 34 orang (50%).
Kebugaran kardiorespirasi memungkinkan aktivitas fisik dalam waktu lama dan memerlukan oksigen untuk mendapatkan energi. Transpor oksigen dimediasi oleh hemoglobin yang terdapat dalam eritrosit. Kebugaran kardiorespirasi dapat diukur berdasarkan nilai VO2max. Metode latihan High Intensity Interval Training (HIIT) terbukti dapat meningkatkan VO2max. Namun belum jelas apakah peningkatan VO2max diiringi dan berhubungan dengan perubahan nilai hemoglobin, eritrosit dan hematokrit. Penelitian ini mempelajari korelasi perubahan nilai VO2max, hemoglobin, eritrosit dan hematokrit sebelum dan sesudah latihan HIIT selama 8 minggu. Berdasarkan hasil penelitian, VO2max meningkat sebesar 7,33±4,03 (ml·kg-1·min-1) atau 20,36% (p<0,05), hemoglobin dan eritrosit meningkat sebesar 0,04±0,63 atau 0,24% (p>0,05) dan 0,02±0,22·106/µL atau 0,32% (p>0,05) sedangkan hematokrit mengalami penurunan sebesar 0,12±2% dari volume darah atau 0,27% (p>0,05) dari nilai pre-test. Uji korelasi menunjukkan ada hubungan (p<0,05) antara perubahan nilai hemoglobin, eritrosit dan hematokrit, namun tidak terdapat hubungan (p>0,05) dengan peningkatan VO2max. Correlation of Change in VO2Max, Hemoglobin, Erythrocytes, and Hematocrit After High Intensity Interval Training AbstractCardiorespiratory fitness allows physical activity for a long time and requires oxygen to gain energy. Oxygen transport mediated by hemoglobin present in erythrocytes. Cardiorespiratory fitness can be measured based on VO2max values. High Intensity Interval Training (HIIT) have been shown to improve VO2max. It is not clear whether the increase in VO2max is accompanied and associated with changes in hemoglobin, erythrocyte and hematocrit values. This study aim to find out the correlation of VO2max, hemoglobin, erythrocyte and hematocrit changes before and after HIIT for 8 weeks. The results VO2max increased by 7.33±4.03 (ml·kg-1·min-1) or 20.36% (p<0.05), hemoglobin and erythrocytes increased by 0.04±0.63 or 0.24% (p>0.05) and 0.02±0.22·106/μL or 0.32% (p>0.05) whereas the hematocrit decreased by 0.12±2% of blood volume or 0.27% (p>0.05) of the pre-test value. The correlation test showed a correlation (p<0.05) between changes in hemoglobin, erythrocyte and hematocrit values, but no relationship (p>0.05) with increased VO2max.
Improved technological developments can be felt throughout societies that can have a positive and negative effect. A parent’s knowledge will make the decision to give the child in charge. The purpose of this research is to describe the knowledge of parents about the gawais and the provision of gawais in children aged 9-12 years. The type of research used is quantitative descriptive. The population is a parent of elementary school students from Negeri Wonorejo 2 subdistrict of Semarang district. The number of respondents was 83 randomly picked people (random sampling). Collection of research data using questionnaires that have been tested for validity and reusability. The results showed that 55.4% of respondents knew about the function of gawais and 42.2% of respondents gave the child a gawai. From respondents who give the device only 19.4% that gives the child restrictions. The use of gawais provided by respondents is for entertainment, communication and for child control.
Freediving is a diving activity without any breathing equipments. The durations of the dive activity depend on ability to hold breath (apnea). The ability of apnea may be affected by lung vital capacity. The purpose of this study is to find out the relationship between vital lung capacity and apnea duration in 30 males 19-25 years old. Vital lung capacity measured using spirometer and the duration of apnea measured using stopwatch in swimming pool. Data analyzed using 1-tailed pearson correlation test. The result shows that there is a correlation (p<0,05) between vital lung capacity and the duration of apnea. The correlation coeficient is 0,743 that means this is a strong positive correlation between the two variables.
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