ANALISIS KAPASITAS AEROBIK MAKSIMAL MAHASISWA PENDIDIKAN JASMANI DAN REKREASI PADA MASA PANDEMI COVID19

Kapasitas daya tahan aerobik (VO2Maks) merupakan alat ukur yang dapat digunakan untuk mengetahui tingkat kebugaran jasmani seseorang. VO2Maks disebut juga dengan  konsumsi maksimal oksigen atau pengambilan oksigen maksimal selama latihan     yang meningkat, sehingga menunjukkan kebugaran fisik seseorang. Mahasiswa pendidikan jasmani dan rekreasi memiliki aktivitas fisik yang tergolong tinggi dan berat pada saat menjalani masa perkuliahan karena ada kuliah teori dan kuliah praktek. Pembelajaran daring pada mahasiswa pendidikan jasmani dan rekreasi pada kondisi pandemi membuat kurangnya praktek tatap muka yang maksimal antara mahasiswa dan dosen sehingga hal ini dapat mempengaruhi dari kondisi hasil kapasitas aerobik dan keburagaran mahasiswa yang kurang mendapat perhatian. Penelitian ini bertujuan untuk menetahui tingkat dan persentase tingkat kapasitas daya tahan aerobik (VO2Maks) pada mahasiswa Pendidikan Jasmani dan Rekreasi tahun angkatan 2021 pada masa pandemi covid19. Desain penelitian menggunakan deskriptif kuantitatif dengan metode survei. Sampel penelitian ini adalah 20 orang dari mahasiswa pendidikan jasmani tahun angkatan 2021 yang diambil secara acak. Teknik analisis data yang digunakan adalah deskriptif presentase.Instrumen pengumpulan data menggunakan Multistage Fitness Test (MFT). Hasil penelitian ini menunjukkan bahwa mahasiswa pendidikan jasmani kesehatan dan rekreasi memiliki kapasitas aerobik maksimal rata-rata dalam kategori cukup. Kesimpulan yang didapat dari penelitian ini adalah hasil nilai tingkat kapasitas aerobik mahasiswa pendidikan jasmani dan rekreasi, sejumlah 1 mahasiswa dengan prosentase 5%  dalam kategori baik, 12 mahasiswa dengan prosentase 60% dalam kategori cukup, 4 mahasiswa dengan prosentase 20% dalam kategori kurang dan 3 mahasiswa dengan prosentase 15% dalam kategori kurang sekali

Fermion Condensate and Vacuum Current Density Induced by Homogeneous and Inhomogeneous Magnetic Fields in (2+1)-Dimensions

We calculate the condensate and the vacuum current density induced by external static magnetic fields in (2+1)-dimensions. At the perturbative level, we consider an exponentially decaying magnetic field along one cartesian coordinate. Non-perturbatively, we obtain the fermion propagator in the presence of a uniform magnetic field by solving the Schwinger-Dyson equation in the rainbow-ladder approximation. In the large flux limit, we observe that both these quantities, either perturbative (inhomogeneous) and non-perturbative (homogeneous), are proportional to the external field, in agreement with early expectations.Comment: 8 pages, 2 figures. Accepted for publication in Phys. Rev.

Effects of flywheel training on strength-related variables in female populations. A systematic review

This study aimed to evaluate the effect of flywheel training on female populations, report practical recommendations for practitioners based on the currently available evidence, underline the limitations of current literature, and establish future research directions. Studies were searched through the electronic databases (PubMed, SPORTDiscus, and Web of Science) following the preferred reporting items for systematic reviews and meta-analysis statement guidelines. The methodological quality of the seven studies included in this review ranged from 10 to 19 points (good to excellent), with an average score of 14-points (good). These studies were carried out between 2004 and 2019 and comprised a total of 100 female participants. The training duration ranged from 5 weeks to 24 weeks, with volume ranging from 1 to 4 sets and 7 to 12 repetitions, and frequency ranged from 1 to 3 times a week. The contemporary literature suggests that flywheel training is a safe and time-effective strategy to enhance physical outcomes with young and elderly females. With this information, practitioners may be inclined to prescribe flywheel training as an effective countermeasure for injuries or falls and as potent stimulus for physical enhancement

Thermosyphon Heat Pipe Technology

Heat pipes play vital roles in increasing heat transfer performance of many engineering systems such as solar collectors and this leads to an increase in their usage. Investigation on the performance of heat pipes under different operation conditions and inclination angles is required for effective utilization. In this chapter, a general overview on the construction, operation, advantages, and classifications of heat pipes is presented. Particular attention is given to the heat pipe without wick material in the inner diameter (thermosyphon). Intensive discussions are presented on the construction, operations, advantages and applications of thermosyphon heat pipe. The experimental and numerical approaches on the performance evaluation and characterization of thermosyphon are discussed. A detailed procedure on how experimental work is carried out on thermosyphon is discussed including instrumentation and calibration of the devices. Modelling and simulation of the performance of thermosyphon are discussed, including the model set-up procedure. Factors affecting the performance of thermosyphon such as fill ratio, working fluid, heat input, inclination angles, are analysed based on the overall thermal resistance and thermosyphon performance. Current researches on the effects of major factors affecting the operation of thermosyphon are presented, as well as their current development and various applications in engineering systems

Chiral and Parity Symmetry Breaking for Planar Fermions: Effects of a Heat Bath and Uniform External Magnetic Field

We study chiral symmetry breaking for relativistic fermions, described by a parity violating Lagrangian in 2+1-dimensions, in the presence of a heat bath and a uniform external magnetic field. Working within their four-component formalism allows for the inclusion of both parity-even and -odd mass terms. Therefore, we can define two types of fermion anti-fermion condensates. For a given value of the magnetic field, there exist two different critical temperatures which would render one of these condensates identically zero, while the other would survive. Our analysis is completely general: it requires no particular simplifying hierarchy among the energy scales involved, namely, bare masses, field strength and temperature. However, we do reproduce some earlier results, obtained or anticipated in literature, corresponding to special kinematical regimes for the parity conserving case. Relating the chiral condensate to the one-loop effective Lagrangian, we also obtain the magnetization and the pair production rate for different fermion species in a uniform electric field through the replacement $B\to-iE$.Comment: 9 pages, 10 figure