Purpose: To identify acute effects of a single accentuated eccentric loading (AEL) repetition on subsequent back-squat kinetics and kinematics with different concentric loads. Methods: Resistance-trained men (N = 21) participated in a counterbalanced crossover design and completed 4 protocols (sets × repetitions at eccentric/concentric) as follows: AEL65, 3 × 5 at 120%/65% 1-repetition maximum (1-RM); AEL80, 3 × 3 at 120%/80% 1-RM; TRA65, 3 × 5 at 65%/65% 1-RM; and TRA80, 3 × 3 at 80%/80% 1-RM. During AEL, weight releasers disengaged from the barbell after the eccentric phase of the first repetition and remained off for the remaining repetitions. All repetitions were performed on a force plate with linear position transducers attached to the barbell, from which eccentric and concentric peak and mean velocity, force, and power were derived. Results: Eccentric peak velocity (−0.076 [0.124] m·s−1; P = .01), concentric peak force (187.8 [284.4] N; P = .01), eccentric mean power (−145.2 [62.0] W; P = .03), and eccentric peak power (−328.6 [93.7] W; P < .01) during AEL65 were significantly greater than TRA65. When collapsed across repetitions, AEL65 resulted in slower eccentric velocity and power during repetition 1 but faster eccentric and concentric velocity and power in subsequent repetitions (P ≤ .04). When comparing AEL80 with TRA80, concentric peak force (133.8 [56.9] N; P = .03), eccentric mean power (−83.57 [38.0] W; P = .04), and eccentric peak power (−242.84 [67.3] W; P < .01) were enhanced. Conclusions: Including a single supramaximal eccentric phase of 120% 1-RM increased subsequent velocity and power with concentric loads of 65% 1-RM, but not 80% 1-RM. Therefore, AEL is sensitive to the magnitude of concentric loads, which requires a large relative difference to the eccentric load, and weight releasers may not need to be reloaded to induce performance enhancement.
Justin J. Merrigan, James J. Tufano, Michael Falzone and Margaret T. Jones
Joel L. Prowting, Debra Bemben, Christopher D. Black, Eric A. Day and Jason A. Campbell
The authors sought to determine whether consuming collagen peptides (CP) enhances musculoskeletal recovery of connective tissues following a damaging exercise bout. Resistance-trained males consumed 15 g/day of CP (n = 7) or placebo (n = 8), and after 7 days, maximal voluntary isometric contraction (MVIC), countermovement jump height, soreness, and collagen turnover were examined. Five sets of 20 drop jumps were performed and outcome measures were collected 24, 48, and 120 hr postexercise. Countermovement jump height was maintained in the CP group at 24 hr (PRE = 39.9 ± 8.8 cm vs. 24 hr = 37.9 ± 8.9 cm, p = .102), whereas the CP group experienced a significant decline at 24 hr (PRE = 40.4 ± 7.9 cm vs. 24 hr = 35.5 ± 6.4 cm, p = .001; d = 0.32). In both groups, muscle soreness was significantly higher than PRE at 24 hr (p = .001) and 48 hr (p = .018) but not at 120 hr (p > .05). MVIC in both legs showed a significant time effect (left: p = .007; right: p = .010) over the 5-day postexercise period. Neither collagen biomarker changed significantly at any time point. CP supplementation attenuated performance decline 24 hr following muscle damage. Acute consumption of CP may provide a performance benefit the day following a bout of damaging exercise in resistance-trained males.
This case report described the use of behavioral activation when a former Olympic athlete developed depression after career termination. Four sessions were conducted, one session each week, followed by a boost session 1 month later. In Session 1, the former Olympic athlete displayed mild-to-moderate depression with anxiety and a low quality of life (Montgomery–Åsberg Depression Rating Scale = 21; Generalized Anxiety Disorder-7 Scale = 17; Brunnsviken Brief Quality of Life Scale = 44). By Session 3, the Olympic athlete no longer met the diagnostic criteria for clinical depression or anxiety (Montgomery–Åsberg Depression Rating Scale = 2; Generalized Anxiety Disorder-7 Scale = 7) and the quality of life was improved (Brunnsviken Brief Quality of Life Scale = 60). Follow-up assessments 1-year posttreatment confirmed that the former Olympic athlete continued to improve (Montgomery–Åsberg Depression Rating Scale = 0; Generalized Anxiety Disorder-7 Scale = 0; Brunnsviken Brief Quality of Life Scale = 96). This case report discusses the benefits of proactive support to elite athletes and the use of established clinical psychological treatments, for example, behavioral activation, when athletes develop health-related conditions.
Stefano Montanari, Mehmet A. Şahin, Ben J. Lee, Sam D. Blacker and Mark E.T. Willems
Supplementation with anthocyanin-rich blackcurrant increases blood flow, cardiac output, and stroke volume at rest. It is not known whether cardiovascular responses can be replicated over longer timeframes in fed trained cyclists. In a randomized, double-blind, crossover design, 13 male trained cyclists (age 39 ± 10 years,
Michael McDougall, Noora Ronkainen, David Richardson, Martin Littlewood and Mark Nesti
In sport psychology, organizational culture is usually depicted as shared, consistent, and clear—the glue that holds people together so they can achieve success. There is, however, growing discontent in sport psychology with this idea of culture and extensive critiques in other academic domains that suggest this perspective is limited. Accordingly, the authors draw on narrative interviews with participants (n = 7) from different areas of sport and use Martin and Meyerson’s three perspective (integration, differentiation, and fragmentation) approach to culture alongside thematic analysis to reconstruct three “ideal cases” that exemplify each perspective. The findings emphasize a different pattern of meaning in each actors’ narrative and suggest the need to develop a broader, more inclusive concept of culture, so as not to minimize or dismiss cultural content that is not obviously shared, clear, or created by leadership; a course of action that can enhance both research and practice in the area.
Ava Farley, Gary J. Slater and Karen Hind
Athletic populations require high-precision body composition assessments to identify true change. Least significant change determines technical error via same-day consecutive tests but does not integrate biological variation, which is more relevant for longitudinal monitoring. The aim of this study was to assess biological variation using least significant change measures from body composition methods used on athletes, including surface anthropometry (SA), air displacement plethysmography (BOD POD), dual-energy X-ray absorptiometry (DXA), and bioelectrical impedance spectroscopy (BIS). Thirty-two athletic males (age = 31 ± 7 years; stature = 183 ± 7 cm; mass = 92 ± 10 kg) underwent three testing sessions over 2 days using four methods. Least significant change values were calculated from differences in Day 1 Test 1 versus Day 1 Test 2 (same-day precision), as well as Day 1 Test 1 versus Day 2 (consecutive-day precision). There was high agreement between same-day and consecutive-day fat mass and fat-free mass measurements for all methods. Consecutive-day precision error in comparison with the same-day precision error was 50% higher for fat mass estimates from BIS (3,607 vs. 2,331 g), 25% higher from BOD POD (1,943 vs. 1,448 g) and DXA (1,615 vs. 1,204 g), but negligible from SA (442 vs. 586 g). Consecutive-day precision error for fat-free mass was 50% higher from BIS (3,966 vs. 2,276 g) and SA (1,159 vs. 568 g) and 25% higher from BOD POD (1,894 vs. 1,450 g) and DXA (1,967 vs. 1,461 g) than the same-day precision error. Precision error in consecutive-day analysis considers both technical error and biological variation, enhancing the identification of small, yet significant changes in body composition of resistance-trained male athletes. Given that change in physique is likely to be small in this population, the use of DXA, BOD POD, or SA is recommended.
Kendra Nelson Ferguson, Craig Hall and Alison Divine
The study aimed to determine whether athletes who practice biofeedback are able to self-regulate by reaching resonance frequency and gaining physiological control quicker than if practice time integrates imagery or a rest period. Intervention effectiveness (e.g., intervention length, time spent training) was also explored. Twenty-seven university athletes were assigned to one of three groups: (a) biofeedback (i.e., continuous training), (b) biofeedback/imagery (i.e., interspersed with imagery), and (c) biofeedback/rest (i.e., interspersed with a rest period). Five biofeedback sessions training respiration rate, heart rate variability, and skin conductance were conducted. A repeated-measure analysis of variance showed a significant interaction between groups over time (p ≤ .05) for respiration rate, heart rate variability, and skin conductance, indicating that resonance frequency and physiological control was regained following imagery or a rest period. Postmanipulation check data found intervention length and training time to be sufficient. Combining imagery with biofeedback may optimize management of psychophysiological processes.
Alisia G.T.T. Tran
With the aim of supporting anxiety screening of student-athletes, this study examined the psychometric performance of the GAD-7 and GAD-2 for assessing anxiety and other clinical mental health concerns (depression, past-year and recent suicidality) in student-athletes. Data from intercollegiate varsity athletes (N = 7,584) were drawn from the Healthy Minds Study. Reliability estimates were good in the sample. Area under the curve values were excellent for anxiety and fair to good for depression and suicidality. Across all clinical indicators, a cutoff of 6 (GAD-7) and 2 (GAD-2), respectively, yielded the most balanced sensitivity and specificity rates. Both measures positively correlated with functional impairment, academic impact, and perceived mental health and negatively correlated with positive mental health. Overall, results supported the reliability, accuracy, and construct validity of the GAD-7 and GAD-2 in a national student-athlete sample. Discussion focuses on clinical implications and practical usage of the GAD-7 and GAD-2 with student-athletes.
Graham G. Williams and Áine MacNamara
There is compelling evidence supporting the critical role of high-quality coaching practice in supporting talented youth athletes through and beyond the talent pathway. The purpose of this study was to explore the coaching philosophies of ex-talent pathway athletes and how the meaning and purpose of their coaching in a talent pathway was influenced by their previous pathway experience. Nine participants were purposefully sampled based on their prior involvement as a youth athlete in a talent pathway and current involvement coaching in a talent pathway. The participants identified how their pathway experience influenced their coaching philosophy and applied coaching practice. Specifically, the participants described how their own youth sport experience influenced their current coaching practice through the formation of a developmental coaching philosophy, through their applied coaching practice orientated towards supporting individual development, and by using their previous pathway experience to support coaching success. These findings suggest that the philosophy underpinning talent pathway coaches’ practice was influenced by their own pathway experience, and the purpose of their practice was orientated to positively impact youth development for and beyond sport. Thus, talent pathways in sport have the capability to be recognised as positively influencing the developmental experiences of future coaching practitioners.
Noora J. Ronkainen, Tatiana V. Ryba and Jacquelyn Allen-Collinson
Sport provides many youth participants with a central life project, and yet very few eventually fulfill their athletic dreams, which may lead them to disengage from sport entirely. Many studies have explored the processes of athletic retirement, but little is known about how youth athletes actually reconstruct their relationship with sport and embodiment postretirement. The authors explored these issues in the story of “Pilvi,” a Finnish alpine skier who disengaged from sport in her late adolescence. Employing an existential-phenomenological approach, they conducted six low-structured interviews with Pilvi, combined with visual methods, and identified key themes relating to the body, space, culture, and time. Their findings highlight the difficulty of building a new relationship with sport and the often restrictive cultural horizons of sport and exercise culture that limit the “possible selves.” The authors discuss the significant implications for applied practitioners helping youth athletes and effectively supporting them in leaving their sport.