Closing address

Now that the present international Conference is about to end, I wish to express my heartiest congratulations to the European Society for Engineering Education for organizing their work so remarkably well. I also wish to express my thanks for having been invited to wind up your discussions. You made an excellent choice of theme when you decided to study an engineer's training in an economic and social context. How could one, in fact, remain indifferent to the profound scientific and technical changes that have, during these last decades, affected the whole world? How could one be insensitive to the prodigious technological evolution that will, to be sure, upset our way of life in the next few years? But also, how can we not realize that the transformations that have forged contemporary civilization are essentially due to the engineer's work, thanks to whom the fruits of scientific progress have been mastered to an extraordinary degree.     

“So it Takes Extra Time and Effort,Pero, Vale la Pena”: A Bilingual Teacher’s Testimonio Revealing Pedagogical Clarity

The Urban Review - This testimonio examines how a 3rd grade bilingual teacher unpacks the learning process as it relates to her agency in implementing culturally relevant (Ladson-Billings, Am Educ...     

Capacity and Flexibility in Community College CTE Programs: Program Offerings and Student Success

Research in Higher Education - This article asks whether small changes to community college courses and programs can help improve student outcomes. We use administrative data from the California...     

Postural Influences on the Development of Infant Lateralized and Symmetric Hand‐Use

Within‐individual variability is such an apparent characteristic of infant handedness that handedness is believed to consolidate only in childhood. Research showed that manifest handedness is influenced by emerging postural skills (sitting, crawling, and walking). In this investigation, it was proposed that symmetric hand‐use (tendency to acquire objects bimanually), rather than lateralized hand‐use (the use of one hand more than the other), may be influenced by postural changes. Trajectories of lateralized and symmetric hand‐use for object acquisition were examined in 275 infants tested monthly from 6 to 14 months. Multilevel modeling revealed that change in lateralized hand‐use is unrelated to developmental transitions in infant posture, whereas the trajectory of symmetric hand‐use changes significantly with the development of postural skills.     

Effects of added elastic tubes on open-chain knee extensor strength training

Attaching elastic tubes (ETs) to resistance training machines can affect the exercise load profile. The purpose of this study was to assess the training effects of added ETs, which were strategically attached to provide additional loads only during the deceleration phase of the knee extension exercise. Twenty-two healthy participants, assigned to either an experimental group (with ETs) or a control group (without ETs), participated in a 12-week strength-training program using a knee extension exercise machine. The acceleration effects were quantified and a method of attaching the ETs to the knee extension machine was developed. The effects of the added ETs were analysed by testing dynamic and isometric maximum contractions at four knee flexion angles (10°, 30°, 50°, and 80°). Analyses of covariance with the initial values as the covariate were used to examine the ET effects. A greater increase in isometric maximum strength was found in the experimental group than in the control group at knee flexion angles of 10° [effect size (ES) = 2.25] and 30° (ES = 1.18). No significant difference in the dynamic maximum strength was found between the groups. The use of ETs increased strength at smaller knee flexion angles with quadriceps that were relatively short.     

Correlations between serum and salivary hormonal concentrations in response to resistance exercise

Abstract

The aim of present study was to examine the relationships between serum and salivary values of free testosterone, dehydroepiandrosterone, and cortisol before and after a session of resistance exercise. Twenty-eight healthy men (mean age 40 years, s = 4) participated in the present study. Serum and salivary samples were collected at rest and after a multiple-sets resistance exercise protocol, of approximately 25 minutes duration. Concentrations of free testosterone, dehydroepiandrosterone, and cortisol were measured using radioimmunoassay kits. No significant correlation was observed between serum free testosterone and salivary testosterone (r = 0.22 to 0.26, P > 0.05). Serum cortisol was significantly correlated with salivary cortisol before (r = 0.52, P = 0.005) and after (r = 0.62, P = 0.001) the exercise protocol. Serum and salivary concentrations of dehydroepiandrosterone were significantly correlated before (r = 0.68, P < 0.001) and after (r = 0.7, P < 0.001) exercise. The results of the present study suggest that even under exercise conditions, the salivary values of cortisol and dehydroepiandrosterone can reflect the behaviour of these hormones in blood. However, further studies are necessary to verify if salivary testosterone reflects the behaviour of serum free testosterone during resistance exercise.     

A comparison of lactate indices during ramp exercise using modelling techniques and conventional methods

Abstract

The aim of this study was to compare the lactate indices provided by single- and double-breakpoint models with lactate thresholds obtained with conventional methods. Arterial samples for the determination of lactate concentrations were drawn from eight participants at rest and every minute during a ramp test (15 W · min^?1) on a cycle ergometer. Lactate thresholds were determined from a blood lactate concentration equal to 4 mM (LT₄), from an increase of 1 mM above the resting level (Δ1 mM), and from indirect methods using ventilatory parameters. Other indices were computed from the modelling of the lactate curve using an exponential function (LSI), a polynomial function (Dmax), a semi-log model (SLog), a parabola plus delay model (Mod P), and a two-breakpoint model (Mod M). Mod P and Mod M showed poor agreement with the other methods. LT₄, Dmax, LSI, and respiratory exchange ratio equal to 1 were correlated with each other (0.81 ≤ R ≤ 0.92) and their mean differences ranged from 2.8 to 15 W, with limits of agreement within the range ± 24.6 to ± 42.4 W. These results question the interest in breakpoints models to detect lactate thresholds, knowing that LT₄, LSI, Dmax, and respiratory exchange ratio equal to 1 provide indices that occur at similar power outputs.