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Alyson J. Crozier, Luc J. Martin and Kevin S. Spink

The extent to which humans consider themselves part of a group versus a collection of individuals is termed groupness. Despite a rich history in other domains, research examining the construct in physical activity settings is only beginning to emerge. Indeed, seminal research from other domains and recent efforts in physical activity highlight the importance of groupness perceptions for a range of outcomes. This paper provides an overview of the current groupness conceptualization in physical activity, presents research conducted in exercise and sport contexts, and, most important, provides a roadmap highlighting future research avenues. Proposed lines of enquiry relevant to physical activity include the development of a context-specific conceptualization, advances in methodologies to facilitate measurement and analysis, and the importance of contextualizing groupness research within physical activity settings.

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Jordan D. Herbison, Luc J. Martin and Mustafa Sarkar

Adversity is viewed as both an inevitable and an important experience for elite athletes. The purpose of this study was to explore elite athletes’ perceptions of the experiences and characteristics that helped them overcome a shared sport-specific adversity. Semistructured interviews were conducted with 12 professional athletes (M age = 27.25, SD = 3.28 yr) who had progressed to careers in the National Hockey League (NHL) despite not being selected in the annual amateur entry draft. Participants discussed their long-term objectives of playing in the NHL, previous experiences with adversity, certain psychological characteristics that facilitated their progression (e.g., competitiveness, passion, confidence), and the significance of social support as key factors that helped them overcome the initial and subsequent adversities associated with being unselected during the amateur entry draft. Practical implications and proposed avenues for future research are discussed in the context of the study’s limitations.

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Sarah Lawrason, Jennifer Turnnidge, Luc J. Martin and Jean Côté

To maximize the effectiveness of coach development, educational programs should target coaches’ interpersonal behaviors, be informed by behavior-change techniques, and incorporate comprehensive evaluation procedures. Thus, informed by the full-range leadership model (see Bass and Riggio in 2006) and the Behaviour Change Wheel (see Michie et al. in 2011), Turnnidge and Côté in 2017 developed the Transformational Coaching Workshop (TCW). The purpose of this study was to evaluate the TCW’s effectiveness through observation before and after coaches’ workshop participation. Participants included 8 male head coaches of youth soccer teams. Systematic observation and coding using the Coach Leadership Assessment System were employed pre- and postworkshop to examine coaches’ leadership behaviors. Coaches made improvements in the types of leadership behaviors used and how they were conveyed. This study demonstrates that systematic observation can be implemented to explore real-world changes in behaviors. Future research should examine the impact of the TCW on athlete outcomes.

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Milou Beelen, Louise M. Burke, Martin J. Gibala and Luc J.C. van Loon

During postexercise recovery, optimal nutritional intake is important to replenish endogenous substrate stores and to facilitate muscle-damage repair and reconditioning. After exhaustive endurance-type exercise, muscle glycogen repletion forms the most important factor determining the time needed to recover. Postexercise carbohydrate (CHO) ingestion has been well established as the most important determinant of muscle glycogen synthesis. Coingestion of protein and/or amino acids does not seem to further increase muscle glycogensynthesis rates when CHO intake exceeds 1.2 g · kg−1 · hr−1. However, from a practical point of view it is not always feasible to ingest such large amounts of CHO. The combined ingestion of a small amount of protein (0.2–0.4 g · (0.2−0.4 g · kg−1 · hr−1) with less CHO (0.8 g · kg−1 · hr−1) stimulates endogenous insulin release and results in similar muscle glycogen-repletion rates as the ingestion of 1.2 g · kg−1 · hr−1 CHO. Furthermore, postexercise protein and/or amino acid administration is warranted to stimulate muscle protein synthesis, inhibit protein breakdown, and allow net muscle protein accretion. The consumption of ~20 g intact protein, or an equivalent of ~9 g essential amino acids, has been reported to maximize muscle protein-synthesis rates during the first hours of postexercise recovery. Ingestion of such small amounts of dietary protein 5 or 6 times daily might support maximal muscle protein-synthesis rates throughout the day. Consuming CHO and protein during the early phases of recovery has been shown to positively affect subsequent exercise performance and could be of specific benefit for athletes involved in multiple training or competition sessions on the same or consecutive days.

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Naomi M. Cermak, Martin J. Gibala and Luc J.C. van Loon

Six days of dietary nitrate supplementation in the form of beetroot juice (~0.5 L/d) has been reported to reduce pulmonary oxygen uptake (VO2) during submaximal exercise and increase tolerance of high-intensity work rates, suggesting that nitrate can be a potent ergogenic aid. Limited data are available regarding the effect of nitrate ingestion on athletic performance, and no study has investigated the potential ergogenic effects of a small-volume, concentrated dose of beetroot juice. The authors tested the hypothesis that 6 d of nitrate ingestion would improve time-trial performance in trained cyclists. Using a double-blind, repeated-measures crossover design, 12 male cyclists (31 ± 3 yr, VO2peak = 58 ± 2 ml · kg−1 · min−1, maximal power [Wmax] = 342 ± 10 W) ingested 140 ml/d of concentrated beetroot (~8 mmol/d nitrate) juice (BEET) or a placebo (nitrate-depleted beetroot juice; PLAC) for 6 d, separated by a 14-d washout. After supplementation on Day 6, subjects performed 60 min of submaximal cycling (2 × 30 min at 45% and 65% Wmax, respectively), followed by a 10-km time trial. Time-trial performance (953 ± 18 vs. 965 ± 18 s, p < .005) and power output (294 ± 12 vs. 288 ± 12 W, p < .05) improved after BEET compared with PLAC supplementation. Submaximal VO2 was lower after BEET (45% Wmax = 1.92 ± 0.06 vs. 2.02 ± 0.09 L/min, 65% Wmax 2.94 ± 0.12 vs. 3.11 ± 0.12 L/min) than with PLAC (main effect, p < .05). Wholebody fuel selection and plasma lactate, glucose, and insulin concentrations did not differ between treatments. Six days of nitrate supplementation reduced VO2 during submaximal exercise and improved time-trial performance in trained cyclists.

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Jordan D. Herbison, Terry W. Cowan, Luc J. Martin, Zach Root and Mark W. Bruner

This study sought to examine coaches’ perceptions of social identity among their athletes and explore the ways that they may attempt to influence its development. Semistructured interviews were conducted with 12 head coaches (M age = 49.25 years; SD = 6.5 years; M experience  = 15.75 years; SD = 7.66 years; n female = 1) of male (n = 8) and female (n = 4) competitive youth ice hockey teams. Three main themes were identified through our analysis. First, the coaches’ perceptions of athletes’ social identities were described through examples of peer connection and similarity (i.e., in-group ties), athletes’ experience of positive affect (i.e., in-group affect), and athletes demonstrating the meaning and value that they attribute to team membership (i.e., cognitive centrality). Second, the coaches discussed a variety of ways that they sought to develop and reinforce a shared social identity within their teams. These behaviors aligned with principles advanced within the social identity leadership literature—namely, the coaches acted as in-group prototypes, in-group champions, entrepreneurs of identity, and embedders of identity. Finally, the coaches identified parents and cliques as key social agents with the ability to undermine social identity development. The findings are discussed in relation to both their theoretical and practical implications.

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Luc J. Martin, Jessi Wilson, M. Blair Evans and Kevin S. Spink

Although cliques are often referenced in sporting circles, they have received little attention in the group dynamics literature. This is surprising given their potential influence on group-related processes that could ultimately influence team functioning (e.g., Carron & Eys, 2012). The present study examined competitive athletes’ perceptions of cliques using semistructured interviews with 18 (nine female, nine male) intercollegiate athletes (Mage = 20.9, SD = 1.6) from nine sport teams. Athletes described the formation of cliques as an inevitable and variable process that was influenced by a number of antecedents (e.g., age/tenure, proximity, similarity) and ultimately shaped individual and group outcomes such as isolation, performance, and sport adherence. Further, athletes described positive consequences that emerged when existing cliques exhibited more inclusive behaviors and advanced some areas of focus for the management of cliques within sport teams. Results are discussed from both theoretical and practical perspectives.

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Jorn Trommelen, Milou Beelen, Marjan Mullers, Martin J. Gibala, Luc J.C. van Loon and Naomi M. Cermak

Carbohydrate mouth rinsing during exercise has been suggested to enhance performance of short (45–60 min) bouts of high-intensity (>75% VO2peak) exercise. Recent studies indicate that this performance enhancing effect may be dependent on the prandial state of the athlete. The purpose of this study was to define the impact of a carbohydrate mouth rinse on ~1-hr time trial performance in both the fasted and fed states. Using a double-blind, crossover design, 14 trained male cyclists (27 ± 6 years; 5.0 ± 0.5 W·kg−1) were selected to perform 4 time trials of ~1 hr (1,032 ± 127 kJ) on a cycle ergometer while rinsing their mouths with a 6.4% sucrose solution (SUC) or a noncaloric sweetened placebo (PLA) for 5 s at the start and at every 12.5% of their set amount of work completed. Two trials were performed in an overnight fasted state and two trials were performed 2 h after consuming a standardized breakfast. Performance time did not differ between any of the trials (fasted-PLA: 68.6 ± 7.2; fasted-SUC: 69.6 ± 7.5; fed-PLA: 67.6 ± 6.6; and fed-SUC: 69.0 ± 6.3 min; Prandial State × Mouth Rinse Solution p = .839; main effect prandial state p = .095; main effect mouth rinse solution p = .277). In line, mean power output and heart rate during exercise did not differ between trials. In conclusion, a sucrose mouth rinse does not improve ~1-hr time trial performance in well-trained cyclists when performed in either the fasted or the fed state.

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Naomi M. Cermak, Peter Res, Rudi Stinkens, Jon O. Lundberg, Martin J. Gibala and Luc J.C. van Loon


Dietary nitrate supplementation has received much attention in the literature due to its proposed ergogenic properties. Recently, the ingestion of a single bolus of nitrate-rich beetroot juice (500 ml, ~6.2 mmol NO3 ) was reported to improve subsequent time-trial performance. However, this large volume of ingested beetroot juice does not represent a realistic dietary strategy for athletes to follow in a practical, performancebased setting. Therefore, we investigated the impact of ingesting a single bolus of concentrated nitrate-rich beetroot juice (140 ml, ~8.7 mmol NO3 ) on subsequent 1-hr time-trial performance in well-trained cyclists.


Using a double-blind, repeated-measures crossover design (1-wk washout period), 20 trained male cyclists (26 ± 1 yr, VO2peak 60 ± 1 ml · kg−1 · min−1, Wmax 398 ± 7.7 W) ingested 140 ml of concentrated beetroot juice (8.7 mmol NO3 ; BEET) or a placebo (nitrate-depleted beetroot juice; PLAC) with breakfast 2.5 hr before an ~1-hr cycling time trial (1,073 ± 21 kJ). Resting blood samples were collected every 30 min after BEET or PLAC ingestion and immediately after the time trial.


Plasma nitrite concentration was higher in BEET than PLAC before the onset of the time trial (532 ± 32 vs. 271 ± 13 nM, respectively; p < .001), but subsequent time-trial performance (65.5 ± 1.1 vs. 65 ± 1.1 s), power output (275 ± 7 vs. 278 ± 7 W), and heart rate (170 ± 2 vs. 170 ± 2 beats/min) did not differ between BEET and PLAC treatments (all p > .05).


Ingestion of a single bolus of concentrated (140 ml) beetroot juice (8.7 mmol NO3 ) does not improve subsequent 1-hr time-trial performance in well-trained cyclists.

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A. Justine Dowd, Toni Schmader, Benjamin D. Sylvester, Mary E. Jung, Bruno D. Zumbo, Luc J. Martin and Mark R. Beauchamp

The objective of the studies presented in this paper was to examine whether the need to belong can be used to enhance exercise cognitions and behavior. Two studies examined the effectiveness of framing exercise as a means of boosting social skills (versus health benefits) for self-regulatory efficacy, exercise intentions, and (in Study 2) exercise behavior. In Study 1, inactive adults primed to feel a lack of social belonging revealed that this manipulation led to greater self-regulatory efficacy (but not exercise intentions). In Study 2, involving a sample of inactive lonely adults, all participants reported engaging in more exercise; however, those in the social skills condition also reported a greater sense of belonging than those in the health benefits comparison condition. These findings provide an important basis for developing physical activity interventions that might be particularly relevant for people at risk for feeling socially isolated or lonely.