Judul: Intervensi air putih dan High Intensity Interval Training (HIIT) terhadap perubahan Indeks Massa Tubuh (IMT) dan indeks kebugaran kardiovaskular remaja overweight
Abstrak: Prevalence of overweight was increased in Indonesia according to Ministry of Health (2013) showed that the overweight on person who have ages in arrange 16-18 years was 7.30%; 19 years was 8.30%; 20-24 years was 13.20%. Efforts to weight loss can be done with a combination of diet, physical activity, and changes in lifestyle (Manore 2012). Plain water had possibility of being the ideal target for the purpose to lose weight (Tate et al. 2012). The American College of Sports Medicine was recommended that HIIT (High Intensity Interval Training) was physical exercise exactly combined with others diet (Kravitz 2014). A combination of research combining diet and physical exercise namely the intervention of plain water intake (PWI) and High Intensity Interval Training (HIIT) to achieve change body mass index and the cardiorespiratoty fitness index of overweight students are rare. The objectives are to analyse the influence of the intervention of plain water intake (PWI) and High Intensity Interval Training (HIIT) on changes in Body Mass Index (BMI) and the Cardiorespiratory Fitness Index (CFI) of overweight students. A special purpose among others identified the habit of eating and drinking, food consumption, as well as food consumption level of subject; identified the habit of sports, the level of physical activity, sleeping patterns, and the level of stress subject; analyse the influence of PWI, HIIT and a combination of both on changes in body weight; analyse the influence of PWI, HIIT, and a combination of both on changes in Body Mass Index (BMI); analyse the influence of PWI, HIIT and a combination of both on changes in cardiorespiratory fitness index (CFI). A design was pre-post experimental study with three groups, namely; (1) plain water intake group (PWI) was nine subjects, (2) High Intensity Interval Training (HIIT) was ten subjects, (3) a combination of plain water intake and High Intensity Interval Training (PWI & HIIT) was ten subjects.The criterias inclusion are aged 17-23 years (purposive) , having BMI ≥ 23 kg/m2), not in the state of running other diet, healthty, not smoking, and willing to follow every stage of intervention.Whereas, criterias exclusion which is undergoing a diet of another, was consuming a drug or a supplement weight loss. The study lasted for two months, the subject of consuming plain water as many as 600 mls one hour before meals (breakfast, lunch, and dinner). Subjects were doing as many as three times per week HIIT (Monday, Wednesday, and Friday) with the duration of 16 minutes, consist of warming up, HIIT workout, and colling down. According to baseline data, more than half of subjects in study (58.62%) had breakfast also not different between three groups (p>0.05). Among 65.52% do not have a drink before dinner, an average on the distance between drink to meals was 5 minutes, the habit of drinking while meals (34.48%) and the amount of plain water that consumed is around 240 mls for 94.40 % subject, also not different on all of variables between three groups (p>0.05). To scatter a habitually drinks water prior to exercise some 48.30% and the number of plain water consumed
Keyword: Plain Water Intake, Overweight Student, High Intensity Interval Training, Cardiovaskular Fitness Index, Body Mass Index

Judul: Efikasi Air Putih Dan High Intensity Interval Training (Hiit) Terhadap Perubahan Profil Lipid Dan Indeks Kebugaran Kardiorespiratori Mahasiswa Overweight
Abstrak: Di Indonesia, prevalensi penduduk laki-laki dewasa obesitas pada tahun 2013 sebanyak 19.7 persen dan prevalensi obesitas perempuan dewasa (>18 tahun) 32.9 persen, baik laki-laki maupun perempuan mengalami peningkatan dari Data Riskesdas 2010 (Riskesdas 2013). Upaya penurunan berat badan dapat dilakukan dengan kombinasi diet, aktivitas fisik, dan perubahan gaya hidup. Perbaikan status gizi dengan mengkombinasikan olahraga dan diet merupakan kombinasi yang paling efektif dalam mengoptimalkan perbaikan status gizi. Upaya dalam perbaikan status gizi dapat dilakukan dengan mengonsumsi air putih (Tate et al. 2012). Latihan High Intensity Interval Training (HIIT) merupakan latihan kardio yang mengkombinasikan latihan intensitas tinggi dengan intensitas sedang atau rendah dengan waktu atau interval tertentu, latihan HIIT dengan teratur dapat meningkatkan HDL dalam darah dan menurunkan total kolesterol, LDL, trigliserida dalam darah. Tujuan umum penelitian ini adalah untuk menganalisis pengaruh efikasi minum air putih dan High Intensity Interval Training (HIIT) terhadap perubahan profil lipid dan kebugaran fisik remaja overweight. Tujuan khusus antara lain: 1) mengidentifikasi kebiasaan minum air, profil lipid, dan indeks kebugaran 2) mengkaji perubahan status gizi (Indeks Massa Tubuh) dan komposisi tubuh sebelum dan sesudah intervensi; 3) mengkaji efikasi intervensi minum air putih dan High Intensity Interval Training (HIIT) terhadap perubahan profil lipid (total kolesterol, HDL, LDL, dan trigliserida); 4) mengkaji efikasi intervensi minum air putih dan High Intensity Interval Training (HIIT) terhadap perubahan indeks kebugaran kardiorespiratori. Penelitian ini menggunakan desain pre-post experimental study dengan tiga kelompok intervensi. Sebanyak 27 mahasiswa overweight dan obesitas mengikuti intervensi ini selama 2 bulan terbagi atas tiga kelompok intervensi. Kelompok 1 mendapatkan intervensi air putih (DA), kelompok 2 mendapatkan HIIT, dan kelompok 3 kombinasi DA+HIIT. Rata-rata umur pada kelompok DA adalah 19.9±0.6 tahun, pada kelompok HIIT 19.8±0.4 tahun, dan pada kelompok DA+HIIT 19.5 ± 0.9 tahun. Rata-rata konsumsi air putih kelompok DA sebesar 2300 ± 737 mL, kelompok HIIT sebesar 1752 ± 791 mL dan kelompok DA+HIIT sebesar 2500 ± 719 mL. Rata-rata konsumsi dan asupan energi minuman karbonasi kelompok DA sebesar 183 ± 173 mL dan 80 ± 77 kkal, kelompok HIIT sebesar 94 ± 69 mL dan 231 ± 159 kkal, dan kelompok DA+HIIT sebesar 99 ± 73 mL dan 231 ± 159 kkal. Asupan energi pada kelompk DA sebesar 1929 ± 355 kkal, kelompok HIIT sebesar 1908 ± 515 kkal dan kelompok DA+HIIT sebesar 2198 ± 539 kkal. Asupan protein pada kelompok sebesar 52.2 ± 10.4 g, kelompok HIIT sebesar 50.4 ± 11.5 g dan kelompok DA+HIIT sebesar 51.7 ± 12.3 g. Sebagian besar subjek memiliki tingkat aktivitas sangat ringan dan ringan baik hari libur ataupun hari kuliah. Pada hari libur sebesar 74.1% dan sebesar 22.1% memiliki tingkat aktivitas sangat ringan dan ringan. Pada hari kuliah, sebesar 92.6% dan sebesar 7.4% dengan kategori sangat ringan dan ringan. Secara keseluruhan subjek, hanya sebesar 3.7% dari keseluruhan subjek yang memiliki tingkat aktivitas fisik yang sedang. Berdasarkan rata-rata berat badan pada kelompok DA sebesar 69.7 ± 19 kg, kelompok HIIT sebesar 63.6 ± 6.5 kg, dan kelompok DA+HIIT sebesar 63.6 ± 9.6 kg. Hasil ANOVA menunjukkan sebelum intervensi tidak terdapat perbedaan yang nyata berat badan antara ketiga kelompok perlakuan. Setelah intervensi dilakukan, terdapat
Keyword: HIIT, IKK, konsumsi air putih, profil lipid

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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