Differences in distal lower extremity tissue masses and mass ratios exist in athletes of sports involving repetitive impacts

Abstract

The purpose of this study was to compare changes in aerobic condition, strength, and muscular endurance following 8 weeks of endurance rowing alone or in combination with weight-training. Twenty-two elite rowers were assigned to (1) rowing (n = 10, 250–270 km · week^?1) or (2) rowing (n = 12, 190–210 km · week^?1) plus four weight-training sessions each week. Pre and post mean and standardized effect-size (ES) differences in aerobic condition (watts at 4 mmol · L^?1) and strength (isometric pull, N), prone bench-pull (6-repetition maximum, 6-RM), 5- and 30-repetition leg-press and 60-repetition seated-arm-pull (J, performed on a dynamometer) normalized by body mass and log-transformed were analysed, after adjusting for gender. The standardized differences between groups were trivial for aerobic condition (ES [±90% CI] = 0.15; ±0.28, P = 0.37) and prone bench-pull (ES = 0.27; ±0.33, P = 0.18), although a moderate positive benefit in favour of rowing only was observed for the seated-arm-pull (ES = 0.42; ±0.4, P = 0.08). Only the weight-training group improved isometric pull (12.4 ± 8.9%, P < 0.01), 5-repetition (4.0 ± 5.7%, P < 0.01) and 30-repetition (2.4 ± 5.4%, P < 0.01) leg-press. In conclusion, while gains in aerobic condition and upper-body strength were comparable to extensive endurance rowing, weight-training led to moderately greater lower-body muscular-endurance and strength gains.     

Sport event innovativeness: Conceptualization,measurement, and its impact on consumer behavior

Although scholars have had a long-standing interest in product innovation based on technological development, limited attention has been devoted to the study of the innovation of sport event experiences. Two quantitative studies, from the consumer's perspective, were completed to validate the proposed conceptualization of sport event innovativeness composed of six dimensions (player performance, respectful access, self-service technology, aesthetic environment, fan community, and loyalty program), and to examine the hypothesized relationships impacting consumer behavior. Including the dimensions of player performance, fan community, and loyalty program, extends previous research that has focused primarily on technology and process-based innovations. The results indicate the effects of the six dimensions on overall innovativeness are contingent on a consumer's age. The ideas merit further research with respect to formulating an explanation of what factors contribute most to connecting consumers to sport organizations through innovative sport event experiences.     

Kinematics and kinetics of the bench-press and bench-pull exercises in a strength-trained sporting population

Understanding how loading affects power production in resistance training is a key step in identifying the most optimal way of training muscular power – an essential trait in most sporting movements. Twelve elite male sailors with extensive strength-training experience participated in a comparison of kinematics and kinetics from the upper body musculature, with upper body push (bench press) and pull (bench pull) movements performed across loads of 10–100% of one repetition maximum (1RM). 1RM strength and force were shown to be greater in the bench press, while velocity and power outputs were greater for the bench pull across the range of loads. While power output was at a similar level for the two movements at a low load (10% 1RM), significantly greater power outputs were observed for the bench pull in comparison to the bench press with increased load. Power output (P _max) was maximized at higher relative loads for both mean and peak power in the bench pull (78.6 ± 5.7% and 70.4 ± 5.4% of 1RM) compared to the bench press (53.3 ± 1.7% and 49.7 ± 4.4% of 1RM). Findings can most likely be attributed to differences in muscle architecture, which may have training implications for these muscles.     

The reliability of isoinertial force–velocity–power profiling and maximal strength assessment in youth

The purpose of this study was to quantify the inter-session reliability of force–velocity–power profiling and estimated maximal strength in youth. Thirty-six males (11–15 years old) performed a ballistic supine leg press test at five randomized loads (80%, 100%, 120%, 140%, and 160% body mass) on three separate occasions. Peak and mean force, power, velocity, and peak displacement were collected with a linear position transducer attached to the weight stack. Mean values at each load were used to calculate different regression lines and estimate maximal strength, force, velocity, and power. All variables were found reliable (change in the mean [CIM] = ? 1 to 14%; coefficient of variation [CV] = 3–18%; intraclass correlation coefficient [ICC] = 0.74–0.99), but were likely to benefit from a familiarization, apart from the unreliable maximal force/velocity ratio (CIM = 0–3%; CV = 23–25%; ICC = 0.35–0.54) and load at maximal power (CIM = ? 1 to 2%; CV = 10–13%; ICC = 0.26–0.61). Isoinertial force–velocity–power profiling and maximal strength in youth can be assessed after a familiarization session. Such profiling may provide valuable insight into neuromuscular capabilities during growth and maturation and may be used to monitor specific training adaptations.     

Mickey Mouse and Milton: book publishing in the humanities

We report the results of a survey of tenure and promotion criteria in university departments of literature and language in the US. It is clear that the publication of a scholarly monograph remains a conditio sine qua non for the awarding of tenure. We analyze the language of institutional guidelines and standards: these range from the highly concrete to the intentionally vague.     

Lived experience and community sport coaching: A phenomenological investigation

Coaching in the participation domain is the act of coaching participants that are less intensely engaged in sport than performance orientated athletes. This form of coaching is a popular activity occurring in community settings such as schools or sport clubs, and it is often undertaken with a broad range of social and health outcomes in mind. The experiences and practices of the large army of ‘community coaches’¹ have been under-explored in comparison to those of elite performance coaches who focus on competitive success and dominate much academic research. This study focuses on the little known world of the community coach. Drawing on the philosophy of phenomenologists such as Husserl, and in particular the methodology of Van Manen, the study explored the lived experiences of a single case study community coach. Derived from semi-structured interviews and in keeping with Van Manen's methodology, findings are presented in a narrative format. The narrative describes the ‘lifeworld’ of the coach and seeks to identify the ‘essential features’ of community coaching in this case. Specifically, the narrative illustrates a dichotomy in the lifeworld of the coach; between a frenetic practical delivery mode visible in the public arena and a ‘hidden’ largely unknown, private world used predominantly for planning and organising. For this case study coach, the essence of community coaching lay in two complementary activities; planning and then delivering fun based activities that achieved social, health and sporting outcomes. Additionally, interacting with others, such as parents, carers and teachers was identified as an essential feature of this coach's experience.