Fabrizio Perroni

Cortisol, dehydroepiandrosterone sulphate and dehydroepiandrosterone sulphate/cortisol ratio responses to physical stress in males are influenced by pubertal development

To evaluate the influence of chronological age and pubertal development on the hypothalamus-pituitary-adrenal (HPA) axis response to stress, we studied the possible correlations between male pubertal characteristics and salivary cortisol (C), DHEAS and the DHEAS/ C ratio before (pre-stress) and after acute exercise-stress in young male volunteers (no. 87; 13.3±2.1 yr). In our overall study population, the mean pre-stress salivary C and DHEAS concentrations, significantly increased after exercise-related stress, whereas the DHEAS/C ratio significantly decreased. Pre-stress salivary C was positively correlated with chronological age, and after-stress salivary C concentration variations were negatively correlated with pubertal stage, mean testis volume and pre-stress salivary DHEAS. Furthermore, salivary DHEAS concentrations and the DHEAS/C ratio, before and after exercise stress, were positively correlated with chronological age, pubertal stage, pre-stress salivary testosterone (T), testis volume and body mass index (BMI). In contrast with late pubertal stages (P4, P5), young individuals at early stages of puberty (P1 to P3) showed higher C increase and lower DHEAS/C ratio after exercise-related stress. In conclusion, since C is also a mediator of stress-related negative effects on health and the DHEAS/C ratio has been hypothesized as an index for the degree to which an individual is buffered against the negative effects of stress, these data might suggest potentially increased stress-related risks at early stages of male puberty.

Effects of simulated firefighting on the responses of salivary cortisol, alpha-amylase and psychological variables

The aim of this study was to evaluate the effects of a simulated firefighting intervention on salivary alpha-amylase (sA-A), free cortisol (sC), anxiety (STAI), and profile of mood states (POMS) in 20 male firefighters (age 32 ± 1 years, [Vdot]O 2peak: 43 ± 5 ml/kg per min). During the 12-min firefighting intervention (ambient temperature: 13 ± 1°C; relative humidity: 63 ± 1%), individuals spent 63 ± 28% of the time working at heart rate (HR) >85% of individual HRmax, [La] peak 9.2 ± 2.9 mM and ratings of perceived exertion 16 ± 2. At 30 min post-intervention significant (p < 0.001) increases in sA-A (174%) and sC (109%) were found with regard to values recorded before and after 90 min of the firefighting intervention. Since no differences emerged between pre-intervention and post intervention for STAI and POMS values, the hormonal changes were attributable to the intense physical stress of the simulated intervention. Further research is needed during real firefighting activities, where high emotional stress may also be present.

Interlimb coordination, strength, and power in soccer players across the lifespan.

Cortis, C, Tessitore, A, Perroni, F, Lupo, C, Pesce, C, Ammendolia, A, and Capranica, L. Interlimb coordination, strength, and power in soccer players across the lifespan. J Strength Cond Res 23(9): 2458-2466, 2009-This study aimed at verifying whether chronic participation in soccer training has a beneficial effect (p < 0.05) on the improvement and the maintenance of interlimb coordination performance across the lifespan and whether coordination is moderated by strength and power performances. Forty young (12 ± 1 yr), 42 adult (26 ±5 yr), and 32 older (59 ± 11 yr) male soccer players and sedentary individuals were administered in-phase (IP) and antiphase (AP) synchronized (80, 120, and 180 bpm) hand and foot flexions and extensions, handgrip and countermovement jump (CMJ) tests. Regardless of age, soccer players always showed better performances (handgrip: 383 ± 140 N; CMJ: 28.3 ± 8.7 cm; IP: 55.2 ± 12.9 s; and AP: 31.8 ± 25.0 s) than sedentary individuals (handgrip: 313 ± 124 N; CMJ: 21.0 ± 9.4 cm; IP: 46.7 ± 20.2 s, and AP: 21.1 ± 23.9 s). With respect to IP and AP performances, a hierarchical model (p < 0.0001) emerged for CMJ, explaining 30% and 26% of the variance for IP and AP, respectively. In contrast, handgrip did not provide increments in the explained variance. Results indicate that chronic soccer training is beneficial to develop strength, CMJ, and interlimb synchronization capabilities in children, to reach higher levels of proficiency in adults, and to maintain performance in older individuals. The predicted role of CMJ on interlimb coordination indicates that a fine neuromuscular activation timing is central for both jump and coordinative performances. In practice, to induce higher attentional control and executive function in open skill sport athletes and to better prepare players to cope with the demands of their match, coaches should modulate complex motor behaviors with increasing velocity of execution and are strongly recommended to make use of technical and tactical drills that focus on the players agility under time pressure to induce higher attentional control and executive function.

Do Italian fire fighting recruits have an adequate physical fitness profile for fire fighting

The aim of this study was to evaluate the fitness level of Italian male recruits with (volunteers) and without (novices) previous fire-fighting experience. Strength (handgrip; 1RM bench-press), power (counter movement jump (CMJ)), velocity (20 m) and endurance (with and without self-contained breathing apparatus (SCBA)) performances of 29 volunteer (age: 22±3 years; BMI: 23±2) and 51 novice (age 30±5 years; BMI 25±2) fire-fighting recruits were compared (p<0.05). Volunteers showed better performances (p<0.01) for 1RM (80.5±16.5 kg), CMJ (31.4±4.8 cm) and 20 m (3.1±0.2 s) than novices (1RM=68.3±10.5 kg; CMJ=28.0±4.5 cm; 20 m=3.2±0.2 s). No difference emerged for handgrip (481.7±71.4 N) and VO2max with (42.9±5.2 ml/kg/min) and without (54.7±6.2 ml/kg/min) SCBA. Wearing the SCBA, 3% of volunteers and 16% of novices failed to complete the endurance test. Considering that fire fighters perform their job wearing SCBA, it could be advisable to test the fitness level of recruits in this condition.

Coordination of soccer players during preseason training.

Tessitore, A, Perroni, F, Cortis, C, Meeusen, R, Lupo, C, and Capranica, L. Coordination of soccer players during preseason training. J Strength Cond Res 25(11): 3059–3069, 2011—This study aimed to verify whether coordination improves as a result of a preseason soccer training. During 5 experimental sessions (days 1, 6, 11, 15, and 19), 16 semiprofessional male soccer players (22.0 ± 3.6 years) were administered 3 specific soccer tests (speed dribbling, shooting a dead ball, and shooting from a pass) and an interlimb coordination test (total duration of a trial: 60 seconds), consisting of isodirectional and nonisodirectional synchronized (1:1 ratio) hand and foot flexions and extensions at an increasing velocity of execution (80, 120, and 180 b·min−1). Furthermore, subjective ratings were monitored to assess the recovery state (RestQ) of the players, their perceived exertion (rating of perceived exertion [RPE]) for the whole body, and the perceived muscle pain (rating of muscle pain [RMP]) for the lower limbs and the internal training load by means of the session-RPE method. The ratios between post and pretraining RPE and RMP increased only during the first 2 experimental sessions and decreased after the second week of the training camp (p = 0.001). The Rest-Q showed increases (p < 0.05) for general stress, conflict/pressure, social recovery, and being in shape dimensions. Conversely, decreases (p < 0.05) were observed for social stress, fatigue, physical complaints dimensions. Throughout the preseason, the players improved their speed dribbling (p = 0.03), Shooting from a Pass (p = 0.02), and interlimb coordination (p < 0.0001) performances. These coordination tests succeeded in discriminating coordination in soccer players and could integrate field test batteries during the whole soccer season, because they were easily and inexpensively administrable by coaches.

Heart Rate Responses and Technical-Tactical Aspects of Official 5-A-Side Youth Soccer Matches Played on Clay and Artificial Turf

Tessitore, A, Perroni, F, Meeusen, R, Cortis, C, Lupo, C, and Capranica, L. Heart rate responses and technical-tactical aspects of official 5-a-side youth soccer matches played on clay and artificial turf. J Strength Cond Res 26(1): 106–112, 2012—Using a randomized crossover design, this study aimed to compare the heart rate (HR) responses and match analysis parameters (i.e., type of action; the number of players involved in an action; the number of passes performed in a collective action; precision of the shots; lost balls; ball interceptions; dribblings; and tackles) of official 5-a-side youth male soccer matches played over 2 pitch surface (i.e., clay vs. artificial turf) conditions. Twenty-two young male soccer players (age 8.3 ± 0.4 years) engaged in 2 consecutive 15-minute periods in each experimental condition. During the match, 53% of HR responses exceeded 85% of the individual HRpeak. No difference emerged between both pitch surfaces and match periods for HR and match analysis indicators. The two 15-minute periods resulted in being appropriate for 8-year-old players, in resembling the intensity of play and the intermittent nature of adult soccer. The similar HR responses and technical-tactical patterns observed on the 2 surfaces indicate that youth match play is not affected by differences in pitch surface. To support the development of individual and team skills of young soccer players, coaches are advised to prioritize game knowledge based on divergent thinking and experience, rather than traditional teaching based on instructions.

Changes in jump, sprint, and coordinative performances after a senior soccer match.

Abstract Cortis, C, Tessitore, A, Lupo, C, Perroni, F, Pesce, C, and Capranica, L. Changes in jump, sprint, and coordinative performances after a senior soccer match. J Strength Cond Res 27(11): 2989–2996, 2013—This study aimed to verify the short-term after effects of a soccer match on senior players’ all-out and interlimb coordination performances. Right before (prematch) and after (postmatch) a match, 10 senior (52.3 ± 10.2 years) male soccer players were administered jump (countermovement jump [CMJ]; repeated jump [RJ]), sprint (10 m and 10 m while dribbling the ball [10 mDB]), in-phase (IP) and antiphase (AP) interlimb coordination (synchronized hand and foot flexions and extensions at 80, 120, 180 bpm). Heart rate (HR) responses and subjective rating of perceived exertion (RPE) and rating of muscle pain (RMP) were used to evaluate the intensity of the friendly match. During the match, HR >85% of individual HRmax occurred for 50% of playing time. Subjective ratings at the end of the match were 12.9 ± 2.2 pt and 2.7 ± 2.2 pt for RPE and RMP, respectively. Postmatch CMJ, 10 m, 10 mDB, AP, IP 80 bpm, and IP 120 bpm performances did not show any difference with respect to prematch values, whereas improvements (p < 0.05) in RJ (prematch: 17.4 ± 3.9 cm; postmatch: 19.3 ± 4.8 cm) and IP 180 bpm (prematch: 30.4 ± 15.1 second; postmatch: 50.3 ± 18.9 second) emerged. These findings indicate that senior soccer players are able to cope with the high demands of match play and suggest that an acute bout of intense exercise has an arousing effect that counteracts fatigue effects and facilitates the performance of old trained individuals on complex motor behaviors relying on central executive control. In considering that players consider soccer as highly motivating, with advancing years this sport could help players in preserving high mental and physical functions and maintaining active engagement in life through social interactions.

Anthropometric and Somatotype Characteristics of Young Soccer Players: Differences Among Categories, Subcategories, and Playing Position.

Abstract Perroni, F, Vetrano, M, Camolese, G, Guidetti, L, and Baldari, C. Anthropometric and somatotype characteristics of young soccer players: Differences among categories, subcategories, and playing position. J Strength Cond Res 29(8): 2097–2104, 2015—Considering that anthropometric parameters are important factors in the performance of the soccer players, the aim of this study was to explore the differences in anthropometric and somatotype characteristics of Italian young soccer players. Weight, height, body mass index, and somatotype of 112 young soccer players, grouped in Giovanissimi “A” (14 years), “B” (13 years), and “C” (12 years) as well as Allievi “B” (15 years) and “A” (16 years) and “Juniores” (older than 17 years), were evaluated. Statistical analysis tests were computed at p ⩽ 0.05, and an analysis of variance for each somatotype was calculated to analyze the main effects and interactions of the factors: categories, subcategories, and playing position. Bonferronis post hoc analysis was used to identify differences among mean values. Considering all subjects, we have found significant differences in categories, subcategories, and playing position between anthropometric values and a somatotype value of 2.8-3.8-2.9. Significant differences have found among goalkeepers and the others playing position in endomorphy (p ⩽ 0.001) and with defenders and midfielders in ectomorphy (p < 0.01) components, whereas no differences in mesomorphy. Analyzing the interaction between subcategories and playing position factors, a significant effect was found only in the endomorphy component (p = 0.05). The analysis of anthropometric characteristic of Italian young soccer players indicates that players have high muscularity value and low adiposity. This study showed the presence of somatotype differences for playing position within categories also in the youngest categories and subcategories, in particular, in the endomorphy component. Young soccer players should be trained with more appropriate and specific training load to avoid the increased injury risk during adolescence.

I.S.Mu.L.T. First-time patellar dislocation guidelines

Primary traumatic patellar dislocation is common, particularly in young active individuals. A consensus on its management is still lacking. The present work provides easily accessible guidelines to be considered as recommendations for a good clinical practice developed through a process of systematic review of the literature and expert opinion, to improve the quality of care and rationalize the use of resources. LEVEL OF EVIDENCE Ia.

Relationship Among Repeated Sprint Ability, Chronological Age, and Puberty in Young Soccer Players

Abstract Perroni, F, Pintus, A, Frandino, M, Guidetti, L, and Baldari, C. Relationship among repeated sprint ability, chronological age, and puberty in young soccer players. J Strength Cond Res 32(2): 364–371, 2018—The aim of this study was to analyzed the relationship of repeated sprint ability (RSA) with chronological age and puberty in 100 young soccer players (age: 13 ± 3 years–160 ± 33 months-; height: 159 ± 16 cm, mass: 49.7 ± 14.1 kg; body mass index [BMI] 19.2 ± 2.5 kg/m2) grouped on “Pulcini” (9–10 years), “Esordienti” (11–12 years), “Giovanissimi” (13–14 years), “Allievi” (15–16 years), and “Juniores” (>17 years) categories. Anthropometric (weight, height, BMI), RSA (7 × 30 m sprint with 25 seconds active rest: total time—TT, the lowest sprinting time, and the fatigue index percentage—%IF), and development (self-administered rating scale for pubertal development PDS; puberty) parameters were measured. ANOVA among categories was applied to asses differences (p ⩽ 0.05) in TT and %IF. When a significant effect was found, Bonferronis post hoc analysis was used. Pearson correlation among all variables was calculated considering all subjects and also within categories. Among categories, statistical analysis showed significant differences (p < 0.001) in TT and a considerable trend toward significance (p = 0.06) in %IF. Significant correlations among variables were found in all subjects and within categories. In particular, TT showed large significant correlation with PDS (r = −0.66) and puberty (r = −0.67) only in “Esordienti.” This study provides useful information for the coach to propose an appropriate training and to obtain the optimal training effect and to minimize the risk of injury and overtraining during the different phases of growth and maturation.