I am not sure by what fortunate circumstance I was invited to contribute to this special issue of Kinesiology Review. However, I am deeply honored to be part of an issue with such esteemed scholars and colleagues. Like many, my introduction to the field of kinesiology was through sports, but my inspiration to pursue kinesiology as a career was the result of an injury that ended my sporting ambitions. My career is characterized by little planning, large amounts of dumb luck, a willingness to explore some paths that are less well trodden, and deep and enduring friendships that have resulted from a spirit of teamwork and collaboration. The work has been hard, the hours have been long, but the payoff has been enormously gratifying. The overarching lesson from my career for emerging scholars is to have an adventurous spirit and seek out excellent mentors and collaborators.
David I. Anderson
Daniel L. Plotkin, Kenneth Delcastillo, Derrick W. Van Every, Kevin D. Tipton, Alan A. Aragon, and Brad J. Schoenfeld
Branched-chain amino acids (BCAA) are one of the most popular sports supplements, marketed under the premise that they enhance muscular adaptations. Despite their prevalent consumption among athletes and the general public, the efficacy of BCAA has been an ongoing source of controversy in the sports nutrition field. Early support for BCAA supplementation was derived from extrapolation of mechanistic data on their role in muscle protein metabolism. Of the three BCAA, leucine has received the most attention because of its ability to stimulate the initial acute anabolic response. However, a substantial body of both acute and longitudinal research has now accumulated on the topic, affording the ability to scrutinize the effects of BCAA and leucine from a practical standpoint. This article aims to critically review the current literature and draw evidence-based conclusions about the putative benefits of BCAA or leucine supplementation on muscle strength and hypertrophy as well as illuminate gaps in the literature that warrant future study.
Mana Ogawa, Chiaki Ohtaka, Motoko Fujiwara, and Hiroki Nakata
The authors investigated the kinematic characteristics of the standing long jump in preschool children. Sixty 4-year-old children (boys: 30 and girls: 30) and sixty 5-year-old children (boys: 30 and girls: 30) participated in the present study. The authors focused on three differences in kinematics: between 4- and 5-year-old children, between boys and girls, and between high and low jumping performance groups at the same age. The kinematic data included the maximum flexions of the knee and hip before takeoff, at takeoff, and on landing; angular displacement of the upper body; takeoff speeds in horizontal and vertical directions; and takeoff angle of the greater trochanter. Anthropometric variables and kinematic data were separately analyzed with factors of age, sex, and group. The authors also performed multiple regression analysis to identify predictors of the jump distance. The movement speed of the greater trochanter in a horizontal direction, the maximum flexion angle of the hip before takeoff, and the hip angle on landing were identified as significant predictors of the jump distance among young children. These findings suggest that knowing how to use the hip and awareness of the horizontal direction are key factors to improve the long jump distance in young children.
An examination of the kinds of questions we ask ourselves provides a window through which to interpret our history and imagine our future. I suggest that there are three kinds of questions—large ones, small ones, and leaky ones. Those that are identified as large and small map onto the value structures we have created for ourselves in higher education. I call these structures caste systems in which some subdisciplines are valued over others, and theoreticians stand above both practitioners and skill teachers. Leaky questions are those that cross boundaries because they cannot be effectively answered by those residing in any one area or at any one level. I argue that leaky questions generate humility, mutual respect, and incentives for collaboration. I trace my own attempts to address all three kinds of questions as a sport philosopher and conclude that our brighter future in kinesiology, including our attempts to address the harms created by the caste system, requires us to see that most of the questions we find interesting are, in fact, leaky in nature.
Jane E. Clark
The past is prologue, writes Shakespeare in The Tempest. And there seems no better expression to capture the theme of my essay on searching the future of kinesiology in its recent past through my lens as a motor development scholar. Using the developmental metaphor of climbing a mountain amidst a range of mountains, the progressing stages of my development and that of kinesiology are recounted. Over the five-plus decades of my growth as an academic and that of kinesiology, I look for the antecedents and the constraints that shape our change and may shape the future of the field of motor development and kinesiology.
Barbara E. Ainsworth
This paper provides reflections on my academic career in kinesiology and public health from an autobiographical perspective. Themes include the importance of movement and physical activity in my development and career choices, a recognition of the importance of physical activity for health outcomes, experiences in studying physical activity in a public health framework, and observations on kinesiology in higher education. I also reflect on the importance of the physical education and physical activity environment that brought me a sense of belonging, enjoyment, and accomplishment that has lasted throughout my career. As in sports and professional activities, I have tried my best and never given up until I felt the task was done.
In this essay, I drew upon the perspectives of Walter Benjamin’s “angel of history” in reflecting upon the history of kinesiology and the influences that led to my own academic career in kinesiology. I have outlined how my disciplinary training as a physical educator and educational historian provided the resources to propel my continuing inquiry into the inter- and cross-disciplinary (and intrinsically entangled) nature of kinesiology. Gender, nationality, training, location, and timing all had their influences on my education and job opportunities and upon building toward a career in a research university where physical education and kinesiology, by design and accident, increasingly separated from one another. From the perspective of a sport historian, I suggest that the language and pursuit of balance might be applied productively to thinking about the future of kinesiology. Sport historians can help in this mission by training a critical lens upon the ongoing traffic between nature and culture and the deep sociocultural situatedness of the science and technology practices used in kinesiology teaching and research in the 21st century. In essence, they can illuminate the historical context of the tools that now frame kinesiology’s questions and the political context in which their answers emerge.
Ed Maunder, Daniel J. Plews, Fabrice Merien, and Andrew E. Kilding
Many endurance athletes perform specific blocks of training in hot environments in “heat stress training camps.” It is not known if physiological threshold heart rates measured in temperate conditions are reflective of those under moderate environmental heat stress. A total of 16 endurance-trained cyclists and triathletes performed incremental exercise assessments in 18°C and 35°C (both 60% relative humidity) to determine heart rates at absolute blood lactate and ventilatory thresholds. Heart rate at fixed blood lactate concentrations of 2, 3, and 4 mmol·L−1 and ventilatory thresholds were not significantly different between environments (P > .05), despite significant heat stress-induced reductions in power output of approximately 10% to 17% (P < .05, effect size = 0.65–1.15). The coefficient of variation for heart rate at these blood lactate concentrations (1.4%−2.9%) and ventilatory thresholds (2.3%−2.7%) between conditions was low, with significant strong positive correlations between measurements in the 2 environments (r = .92–.95, P < .05). These data indicate heart rates measured at physiological thresholds in temperate environments are reflective of measurements taken under moderate environmental heat stress. Therefore, endurance athletes embarking on heat stress training camps can use heart rate–based thresholds ascertained in temperate environments to prescribe training under moderate environmental heat stress.
Bent R. Rønnestad, Sjur J. Øfsteng, Fabio Zambolin, Truls Raastad, and Daniel Hammarström
Purpose: To compare the effects of a 1-week high-intensity aerobic-training shock microcycle composed of either 5 short-interval sessions (SI; n = 9, 5 series with 12 × 30-s work intervals interspersed with 15-s recovery and 3-min recovery between series) or 5 long-interval sessions (LI; n = 8, 6 series of 5-min work intervals with 2.5-min recovery between series) on indicators of endurance performance in well-trained cyclists. Methods: Before and following 6 days with standardized training loads after the 1-week high-intensity aerobic-training shock microcycle, both groups were tested in physiological determinants of endurance performance. Results: From pretraining to posttraining, SI achieved a larger improvement than LI in maximal oxygen uptake (5.7%; 95% confidence interval, 1.3–10.3; P = .015) and power output at a blood lactate concentration of 4 mmol·L−1 (3.8%; 95% confidence interval, 0.2–7.4; P = .038). There were no group differences in changes of fractional use of maximal oxygen uptake at a workload corresponding to a blood lactate concentration of 4 mmol·L−1, gross efficiency, or the 1-minute peak power output from the maximal-oxygen-uptake test. Conclusion: The SI protocol may induce superior changes in indicators of endurance performance compared with the LI protocol, indicating that SI can be a good strategy during a 1-week high-intensity aerobic-training shock microcycle in well-trained cyclists.