The Relationship of Selected Biomechanical Variables with the Performance in Javelin Throw

The aim of the study is to assess the relationship between selected biomechanical variables with the performance in Javelin throw.  Five male Javelin throwers of Lakshmibai National University of Physical Education, Gwalior from the track & field match practice group were selected as the subject for the present study. Their age was between 17 to 25 years. The sequential photography technique was employed to record the technique of javelin throwers. A Motor driven, Nikon D-40 camera was used. The subjects were photographed at stance position and release moment in sagittal plane. From the photographs, the stick figures were prepared by using Joint-point Method, and various biomechanical variables were obtained at the moment of releasing the javelin, suggested by Hay. Pearson’s product moment correlation was used to find out the relationship of selected biomechanical Variables with the performance of male Javelin throwers. The level of significance was tested at .05. The angle right and left ankle joint and left elbow joint have exhibited significant relationships at stance position and In case of release moment shoulder joint (right) and elbow joint (left) have shown significant relationship with the performance of subject. The result of the height of C.G. at selected moments has insignificant relationship with the performance of subject at stance position and at release moment. Training focusing on Right knee, ankle, hip and shoulder joint is recommended. Keywords: Javelin Throw-Biomechanical variables-Joint-Point Method

Two Dimensional Kinematic Analysis of Set position to First Step with Sprinting Performance of University Athletes

The purpose of the study was to assess the effect of kinematical selected parameters of set position to first step with sprinting performance of University athletes. Six (3 Intervarsity and 3 Intercollegiate level) athletes of Lakshmibai National Institute of Physical Education, NERC, Guwahati has been selected for this study. The mean and standard deviation (SD) of sprinters were age (20.64, 1.64), height (1.73.13 cm, 5.84), weight (61.14 kg, 3.44), arm length (62.00 cm, 3.72) and leg length (93.33 cm, 2.71). For acquiring two-dimensional kinematical data, each subject was asked to warm-up for at least 15 minutes by stretching all major muscle groups for better performing the first step during block start. Biokin-2D motion analysis system V4.5 can be used for kinematical analysis of Set position to First Step on Block Start Sprinting Performance. A standard motion driven camera i.e. handy camera of Sony Company, which frequency of the camera was 50 frame/ second. Even though this camera register photograph, at the moments from set position to first step was selected for the purpose of analysis. The photographic sequence was taken under controlled condition. The distance of the camera from the subjects was 10 mts away and was fixed at one-meter height. The alpha level of significance was set at p<0.05 for all statistical tests. The result was found that Intervarsity and Intercollege athletes in there, Trajectory Knee, Trajectory Ankle, Displacement Knee, Displacement Ankle, Linear Velocity Knee, Linear Velocity Ankle and Linear Acceleration Ankle whereas insignificant difference was found between Intervarsity and Intercollege in their Linear Acceleration Knee joint of set position to first step with sprinting performance. Keywords: 2D Kinematic Analysis, Set Position to First Step, Sprinting Performanc

Electrochemical, Regioselective, and Stereoselective Synthesis of Allylic Thioethers and Selenoethers under Transition-Metal-Free and Oxidant-Free Conditions

We disclose a mild, scalable, electricity-promoted cross coupling protocol between allylic iodides and disulfides/diselenides for the formation of C–S/Se bonds in the absence of transition metals, bases, and oxidants. The stereochemically different densely functionalized allylic iodides gave regio- and stereoselective diverse thioethers in good yields. This strategy demonstrates a sustainable promising approach for the synthesis of allylic thioethers in 38–80% yields. This protocol also provides a synthetic platform for the synthesis of allylic selenoethers. A single-electron transfer radical pathway was also validated with radical scavenger experiments and cyclic voltammetry data

Electrochemical, Regioselective, and Stereoselective Synthesis of Allylic Thioethers and Selenoethers under Transition-Metal-Free and Oxidant-Free Conditions

We disclose a mild, scalable, electricity-promoted cross coupling protocol between allylic iodides and disulfides/diselenides for the formation of C–S/Se bonds in the absence of transition metals, bases, and oxidants. The stereochemically different densely functionalized allylic iodides gave regio- and stereoselective diverse thioethers in good yields. This strategy demonstrates a sustainable promising approach for the synthesis of allylic thioethers in 38–80% yields. This protocol also provides a synthetic platform for the synthesis of allylic selenoethers. A single-electron transfer radical pathway was also validated with radical scavenger experiments and cyclic voltammetry data

Electrochemical Bisarylation of Carbonyls: A Direct Synthetic Strategy for Bis(indolyl)methane

An interesting electrochemical direct bisarylation of carbonyls with indole derivatives to afford the corresponding bis(indolyl)methane (BIM) derivatives is described. The developed protocol is suitable for aliphatic, aromatic, and heteroaromatic aldehydes, which react with various electron-rich and electron-poor indoles to afford the corresponding BIMs in good to excellent yields. Isatin derivatives also underwent bisarylation with various indole derivatives under the influence of current to afford the corresponding BIMs in excellent yields