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All Journal Jurnal Kimia Riset Pendas : Jurnah Ilmiah Pendidikan Dasar
Dila Savira
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Chemistry Other

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PEMANFAATAN EKSTRAK DAUN KITOLOD (Hippobroma Longiflora (L) G.Don) SEBAGAI BAHAN AKTIF SEDIAAN TABIR SURYA Dila Savira; Damayanti Iskandar
Jurnal Kimia Riset Vol. 5 No. 1 (2020): Juni
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v5i1.19680

Abstract

Telah dilakukan penelitian untuk memanfaatkan ekstrak daun kitolod  (Hippobroma longiflora (L) G. Don) sebagai tabir surya. Daun kitolod di ekstraksi secara maserasi dengan pelarut metanol kemudian di fraksinasi menggunakan n-heksana dan etil astetat. Kandungan kimia yang diperoleh dari ekstrak etil asetat adalah flavonoid, alkaloid, dan steroid. Untuk mengetahui aktivitas ekstrak tersebut dilakukan pengujian dengan cara mengukur absorbansi larutannya pada tingkat konsentrasi tertentu dengan menggunakan spektrofotometri UV-Vis. Nilai SPF yang diperoleh dari konsentrasi 100 ppm, 200 ppm, 300 ppm, 400 ppm, dan 500 ppm berturut-turut sebesar 4,3; 10,3; 15,2; 21,5; dan 28. Konsentrasi 100 ppm termasuk kedalam SPF kategori proteksi sedang, konsentrasi 200 ppm termasuk kedalam SPF kategori proteksi maksimal. Konsentrasi 300 ppm, 400 ppm, 500 ppm termasuk kedalam SPF  kategori proteksi ultra.Kata Kunci : Daun Kitolod, Tabir Surya, SPF.
EFEKTIVITAS LATIHAN HILL SPRINT DALAM MENINGKATKAN DAYA LEDAK OTOT TUNGKAI DAN KECEPATAN MAKSIMAL PELARI 400 METER PADA MAHASISWA PKO UNIVERSITAS SULAWESI TENGGARA Muh. Yasa; La Ode Ahmad Yusran; Dila Savira; Agus Kurniadi
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 03 (2026): Volume 11 No. 03, September 2026 Release
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i03.59359

Abstract

This study aims to determine the effectiveness of hill sprint training in improving leg muscle explosive power and maximum speed of 400-meter runners among students of the Sports Coaching Education (PKO) study program at Universitas Sulawesi Tenggara. Explosive power and maximum speed are two dominant biomotor components that determine 400-meter running performance, yet many student athletes still show suboptimal achievement in both components. This research used a quantitative approach with a pre-experimental one-group pretest-posttest design. The sample consisted of 30 students selected through total sampling. Leg muscle explosive power was measured using the standing broad jump test and maximum speed was measured using the 30-meter sprint test. Treatment was given in the form of hill sprint training for 16 sessions with a frequency of three times per week. Data were analyzed using the paired sample t-test after fulfilling the normality prerequisite test. The results showed a significant increase in leg muscle explosive power (t = 11.24; p = 0.000 < 0.05) with an average increase of 7.7%, and a significant increase in maximum speed indicated by a decrease in 30-meter sprint time (t = 9.86; p = 0.000 < 0.05) with an average improvement of 4.6%. Thus, hill sprint training is effective in improving leg muscle explosive power and maximum speed of 400-meter runners.
Co-Authors Agus Kurniadi Damayanti Iskandar La Ode Ahmad Yusran Muh. Yasa