Upper-Limb Muscle Fatigability in Para-Athletes Quantified as the Rate of Force Development in Rapid Contractions of Submaximal Amplitude.

This study aimed to compare neuromuscular fatigability of the elbow flexors and extensors between athletes with amputation (AMP) and athletes with spinal cord injury (SCI) for maximum voluntary force (MVF) and rate of force development (RFD). We recruited 20 para-athletes among those participating at two training camps (2022) for Italian Paralympic veterans. Ten athletes with SCI (two with tetraplegia and eight with paraplegia) were compared to 10 athletes with amputation (above the knee, N = 3; below the knee, N = 6; forearm, N = 1). We quantified MVF, RFD at 50, 100, and 150 ms, and maximal RFD (RFDpeak) of elbow flexors and extensors before and after an incremental arm cranking to voluntary fatigue. We also measured the RFD scaling factor (RFD-SF), which is the linear relationship between peak force and peak RFD quantified in a series of ballistic contractions of submaximal amplitude. SCI showed lower levels of MVF and RFD in both muscle groups (all p values ≤ 0.045). Despite this, the decrease in MVF (Cohen's d = 0.425, p < 0.001) and RFDpeak (d = 0.424, p = 0.003) after the incremental test did not show any difference between pathological conditions. Overall, RFD at 50 ms showed the greatest decrease (d = 0.741, p < 0.001), RFD at 100 ms showed a small decrease (d = 0.382, p = 0.020), and RFD at 150 ms did not decrease (p = 0.272). The RFD-SF decreased more in SCI than AMP (p < 0.0001). Muscle fatigability impacted not only maximal force expressions but also the quickness of ballistic contractions of submaximal amplitude, particularly in SCI. This may affect various sports and daily living activities of wheelchair users. Early RFD (i.e., ≤50 ms) was notably affected by muscle fatigability.

The effect of exercise on mental health and health-related quality of life in individuals with multiple sclerosis: A Systematic review and meta-analysis.

BACKGROUND: A large body of evidence has tested the effect of exercise interventions on mental health and health-related quality of life (HRQoL) in individuals with multiple sclerosis (PwMS). OBJECTIVE: To determine the effect of exercise interventions on mental health and HRQoL in PwMS. METHODS: We searched four databases up to April 2023, and included randomized controlled trials that: 1) involved PwMS ≥18 years old; 2) delivered an exercise intervention; 3) measured subjective well-being, psychological well-being, social well-being, or HRQoL as outcomes. We reported standardized differences in means (d) with a 95 % confidence interval (CI), for continuous outcomes and an incidence rate ratio (IRR) with a 95 % CI for dichotomous outcomes. RESULTS: Forty-nine studies (n = 2,057 participants) were included. Exercise improved overall well-being (d = 0.78; 95 % CI 0.483, 1.077; moderate certainty evidence), subjective well-being (d = 0.666; 95 % CI 0.405, 0.928; moderate certainty evidence), social well-being (d = 1.046; 95 % CI 0.569, 1.523; low certainty evidence), and HRQoL (d = 0.568; 95 % CI 0.396, 0.74; moderate certainty evidence). CONCLUSION: Exercise interventions can improve well-being and HRQoL in PwMS. Future studies should focus on PwMS ≥ 65 years or with higher level of impairments.

Changes in anthropometric and fitness profile of Italian regional academy rugby union players.

In rugby union, physical characteristics may partially contribute to long-term career progression, especially during adolescence. Therefore, the primary purpose of the study was to evaluate Italian regional rugby union academy players' (i.e., under-18) anthropometric and physical characteristics during a competitive season. Body mass, height, upper- and lower-body maximal strength, sprint, and high-intensity running ability were assessed in 29 elite players (backs, n = 13, forwards, n = 16). A mixed-design analysis of variance (ANOVA) for repeated measures showed that backs were shorter (ES = 0.59), lighter (ES = 0.94), stronger relative to body mass (bench press; ES = 0.60; deadlift; ES = 0.63; clean ES = 0.63; rowing ES = 0.67), and fitter (shuttle run max; ES = 0.38; shuttle run tot; ES = 0.79) than forwards. However, the forwards achieved greater sprint momentum (initial sprint momentum; ES = 0.97; maximal sprint momentum; ES = 0.98). During the season, players changed in stature, upper-body maximal strength, jumping, and high intensity running (p < 0.05), but not in body weight or lower-body maximal strength (p > 0.05). Maximal strength improved in the first part of the season, whereas jumping and sprinting performances increased in the last part of the season. Therefore, these findings highlight the importance of regularly monitoring the physical development in a long-term perspective, even suggesting that physiological adaptations are heterochronic between positional roles.

Strength Asymmetries Are Muscle-Specific and Metric-Dependent.

We investigated if dominance affected upper limbs muscle function, and we calculated the level of agreement in asymmetry direction across various muscle-function metrics of two heterologous muscle groups. We recorded elbow flexors and extensors isometric strength of the dominant and non-dominant limb of 55 healthy adults. Participants performed a series of explosive contractions of maximal and submaximal amplitudes to record three metrics of muscle performance: maximal voluntary force (MVF), rate of force development (RFDpeak), and RFD-Scaling Factor (RFD-SF). At the population level, the MVF was the only muscle function that showed a difference between the dominant and non-dominant sides, being on average slightly (3-6%) higher on the non-dominant side. At the individual level, the direction agreement among heterologous muscles was poor for all metrics (Kappa values ≤ 0.15). When considering the homologous muscles, the direction agreement was moderate between MVF and RFDpeak (Kappa = 0.37) and low between MVF and RFD-SF (Kappa = 0.01). The asymmetries are muscle-specific and rarely favour the same side across different muscle-performance metrics. At the individual level, no one side is more performative than the other: each limb is favoured depending on muscle group and performance metric. The present findings can be used by practitioners that want to decrease the asymmetry levels as they should prescribe specific exercise training for each muscle.

Correction to: COVID­19 nationwide lockdown and physical activity profiles among North­western Italian population using the International Physical Activity Questionnaire (IPAQ).

[This corrects the article DOI: 10.1007/s11332-021-00745-8.].

The impact of physical activity rate on subjective well-being among North-Western Italian population during COVID-19 nationwide lockdown.

BACKGROUND: Several factors influence subjective well-being, and one of them is the rate of physical activity. However, the possibilities to perform physical activity are compromised by the running COVID-19 pandemic. Thus, the present study aimed to explore the relationship between self-reported physical activity levels during COVID-19 and subjective well-being. Furthermore, our secondary aim was to investigate whether personal well-being was different between men and women and between people with different self-reported physical activity levels. METHODS: Physical activity rate and subjective well-being were assessed using specific online surveys. Well-being was investigated using the 5-item World Health Organization Well-being Index while physical activity rates using the official Italian short form of IPAQ. Participation was voluntary, and people could fill the questionnaire simply by clicking on a specific link reachable via Social Networks or by email. RESULTS: The final sample size was 595 Italian responders. Male and female were equally distributed (50.3% male and 49.7% female). The multiple regression indicated that the model was a significant predictor of subjective well-being (R2=0.070,F (3,59)=14.68, P<0.0001). The univariate ANOVA detected a statistically significant difference in subjective well-being perception between gender (P<0.05; ƞ2=0.01) and among physical activity rates ([whole sample: P<0.0001, ƞ2=0.03]; Males: F (2,296)=4364, P<0.01, ƞ2=0.03; Females: F (2,293)=5256, P<0.001, ƞ2=0.04). Tuckey's post-hoc identified a difference between Low active and moderate active males (P<0.01) and low active and very active females (P<0.01). CONCLUSIONS: More vigorous activities are necessary for women to reach the goal of feeling good and satisfied with life than men. Therefore, women should be encouraged to spend more time practising physical activity at a more vigorous rate. This outcome might help practitioners set specific home training programs to be advised during periods of social life restrictions as the running COVID-19 pandemic.

COVID-19 nationwide lockdown and physical activity profiles among North-western Italian population using the International Physical Activity Questionnaire (IPAQ).

BACKGROUND: The role of physical activity in enhancing health is well recognized. However, in the more industrialized countries, physical activity rates are declining, and the emerging COVID-19 pandemic may amplify this scenario. Thus, this study aimed to report the Italian population's physical activity profile living in the North-western regions during the national lockdown. METHODS: Physical activity was assessed using the official Italian short form of IPAQ, intended for Social Networking Services (SNS). Participation was voluntary, and people could fill the questionnaire simply by clicking on a specific link. RESULTS: The final sample size was 612 Italians, male and female, equally distributed (49.1% male and 50.9% female). Data showed a percentage of 15.4% of inactive subjects (MET < 700), 61.8% of moderate-active (MET 700-2500), and 22.9% of active people (MET > 2500). Women were more inactive than men (p < 0.01; 57.4% vs 42.6%). Furthermore, participants were classified into four classes of age: 18-29; 30-44; 45-59; and 60-79. Class 18-29 was prevalent (p < 0.01, 68.3%) and showed higher levels of physical activity (p < 0.05). CONCLUSIONS: Italians living in North-western regions maintained a moderate amount of physical activity during the quarantine. This behavior should be encouraged, particularly among women that usually appear to be less active than men.

Game-based versus multilateral approach: effects of a 12-week program on motor skill acquisition and physical fitness development in soccer school children.

BACKGROUND: The purpose of this study was to investigate the effects of a 12-week-game-based training versus a traditional multilateral approach on motor skills acquisition and physical fitness, in a group of U9 children playing soccer. METHODS: Forty children aged 9 or younger (U9) recruited from a local soccer school were assigned in a 1:1 ratio to a game-based training program (GB) or a multilateral training (MA) approach. The training programs lasted 12 weeks, and players were tested at baseline and at the end of the program (12-week follow-up). The outcomes were: standing long jump test, shuttle dribble test, 10×5 shuttle run test and Mini-Cooper test. RESULTS: Within-group comparisons showed statistically-significant improvements in both of the groups: standing long lump (P<0.0001), shuttle dribble test (P<0.0001), shuttle run test (P<0.0001) and Mini-Cooper test (P<0.0001). Furthermore, the MA group showed better performance in the shuttle run test after 12 weeks of training compared to the GB group (P=0.0002; +8%). CONCLUSIONS: A multilateral approach promotes physical development in U9 soccer players without affecting learning of-soccer skills. Therefore, a multilateral approach should be included in soccer training programs to ensure an optimal development in young soccer players.