Effects of drop sets with resistance training on increases in muscle CSA,strength, and endurance: a pilot study

To investigate the effects of a single high-load (80% of one repetition maximum [1RM]) set with additional drop sets descending to a low-load (30% 1RM) without recovery intervals on muscle strength, endurance, and size in untrained young men. Nine untrained young men performed dumbbell curls to concentric failure 2–3 days per week for 8 weeks. Each arm was randomly assigned to one of the following three conditions: 3 sets of high-load (HL, 80% 1RM) resistance exercise, 3 sets of low-load [LL, 30% 1RM] resistance exercise, and a single high-load (SDS) set with additional drop sets descending to a low-load. The mean training time per session, including recovery intervals, was lowest in the SDS condition. Elbow flexor muscle cross-sectional area (CSA) increased similarly in all three conditions. Maximum isometric and 1RM strength of the elbow flexors increased from pre to post only in the HL and SDS conditions. Muscular endurance measured by maximum repetitions at 30% 1RM increased only in the LL and SDS conditions. A SDS resistance training program can simultaneously increase muscle CSA, strength, and endurance in untrained young men, even with lower training time compared to typical resistance exercise protocols using only high- or low-loads.     

Japanese female Kendo practitioners are associated with high radial bone mineral density

Osteopenia is a condition in which bone mineral density (BMD) is lower than normal. Exercise increases BMD in both the young and adults. This study aimed to compare the radial apparent BMD (aBMD) in Japanese females who are Kendo practitioners (KPs) and those with no regular exercise habits (no-REH). The analysis participants consisted of 45 KPs (mean age: 49.4 years old) and 110 no-REH (mean age: 48.8 years old). Radial aBMD was measured using an ultrasonic bone densitometry system. Radial aBMD in KPs was 196.1 ± 33.9 mg/cm³, and was 182.9 ± 45.3 mg/cm³ in no-REH participants. KPs had significantly higher BMD than no-REH participants. In KPs, left radial aBMD was 196.1 ± 33.9 mg/cm³, and right radial aBMD was 184.5 ± 37.7 mg/cm³. The left radius was also significantly higher than the right radius with respect to aBMD in KPs. After adjusting for age, body mass index, menstrual status, parous women and frequency of milk and dairy intake, the odds ratio (OR) of osteopenia associated with no-REH was 6.58 (95% confidence interval (CI): 1.72–25.1) and the prevalence ratio (PR) of osteopenia associated with no-REH was 4.12 (95% CI: 1.23–13.7). Therefore, the Kendo practice may have a protective efficacy for osteopenia in women.     

论高等教育领域合作伙伴关系模型的构建

本文描述一个可以用来审视和检验教育机构之间合作伙伴关系的理论模型,重点讨论该模型的不同组成成分以及它们之间的相互关系,分析合作伙伴关系建立过程中涉及的各个方面,描述合作伙伴关系的重要特征,特别是发展早期的特征,以及提出评估合作伙伴关系时应该考虑的一系列重要问题.＃     

Inverting microwell array chip for the cultivation of human induced pluripotent stem cells with controlled aggregate size and geometrical arrangement

We present a novel cell culture chip, namely, “inverting microwell array chip,” for cultivation of human induced pluripotent stem cells. The chip comprises a lower hydrogel microwell array and an upper polystyrene culture surface. We demonstrate the formation of uniform cellular aggregates in the microwell array, and after inversion, a culture with controlled aggregate size and geometrical arrangement on the polystyrene surface. Here, we report effects of cell concentrations on a cultivation sequence in the chip.     

Middle finger and ball movements around ball release during baseball fastball pitching

The objectives of this study were to investigate middle finger movements and dynamics of ball movements around the instant of ball release during baseball pitching. Baseball pitching from an indoor mound among 14 semi-professional pitchers was captured using a motion capture system with 16 high-speed cameras (1,000 Hz). Kinematics of middle finger joints, ball rotation, and force applied to the ball were calculated. The proximal and distal interphalangeal joints continued to extend until the instant of ball release, then abruptly flexed. The abrupt flexion lasted for only several milliseconds, followed by a short extension phase. The finger made a quick double cycle of extension-flexion movement, suggesting that it attained high stiffness resulting from co-contraction. The ball began to roll up to the tip of the finger 8 ± 1 ms before ball release owing to the start of extension or the increased angular velocity of extension for the proximal interphalangeal joint. A mean force of 195 ± 27 N was applied in the proximal direction of the hand at the same time as the beginning of ball rolling, and a mean force of 109 ± 22 N was applied to the throwing direction just before ball release.     

Student Affairs Professionals in the Community College: Critically Examining Preparation Programs From a Social Justice Lens

ABSTRACT

To support the success of community college students, the role of student affairs professionals is critical. Therefore, adequate preparation of student affairs professionals who work in community college settings is paramount. However, literature focused on the intersection between the community college, student affairs, and graduate preparation is sparse, suggesting that too little is known about the preparation of student affairs professionals exiting graduate education and entering a community college setting. We frame this dearth of literature as an issue of social justice. The lack of focus on community colleges within student affairs preparation programs further reinforces a systemic cycle of oppression related to the perception that community colleges are not an integral part of the higher education landscape. We point to potential entry points for the exploration of this topic through systematic inquiry. The goals of this work are to bring awareness to the paucity of literature on this topic, ask scholars to join us in adding to what is known about this topic, and encourage readers to think critically about this topic.     

Radio-ulnar joint supinates around ball release during baseball fastball pitching

This study was conducted to determine whether a supination phase of the forearm exists around ball release (BRL), and, if present, to determine whether this supination is explained by a reaction force or by the body configuration required for this task. A 16-camera motion analysis system with a sampling frequency of 1,000 Hz recorded 20 healthy male semi-professional pitchers pitching from an indoor pitching mound. A short supination phase around BRL was confirmed for all participants in the current study. Correlation analyses revealed that the supination angle at BRL had significant relationships with several measurements of shoulder movement kinematics. Mechanical work analysis of the forearm’s longitudinal axis revealed several variations in joint power curve and various patterns of mechanical work among the participants, suggesting that a reaction force originating from accelerating a ball might not be the main cause of supination. The raw data also were down-sampled to a sampling frequency of 250 Hz, to match previous studies and to investigate the discrepancy among previous studies concerning the existence of the supination phase. The experience of participants and methodological differences, such as the definition of BRL and the time-normalisation technique, influenced whether the supination phase was observed.     

Learning disabilities in minority adolescents

Summary Seventy “predelinquent” disadvantaged seventh-grade students and 30 controls were compared on fifteen variables. It was found that the experimental group was significantly behind the controls in reading, grade-point-average, IQ test scores (verbal and nonverbal), as well as on measures of visual-motor and auditory perceptual functioning. It appears that the experimental youngsters display a syndrome usually considered to evidence specific learning disabilities. However, in this type of population it is difficult to separate the effects of environmentally determined deficits from inherent deficits. Therefore, it was not possible to estimate the incidence of true specific learning disabilities. On the other hand, it was suggested that regardless of the etiology of the deficits, these children could profit from the same types of educational opportunities as have been found well-suited to aid children with learning disabilities.