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Coronavirus Disease 2019 (COVID-19) has significantly affected different physiological systems, with a potentially profound effect on athletic performance. However, to date, such an effect has been neither addressed nor investigated. Therefore, the aim of this study was to investigate fitness indicators, along with the respiratory and metabolic profile, in post-COVID-19 athletes. Forty male soccer players, were divided into two groups: non-hospitalized COVID-19 ( n  = 20, Age: [25.2 ± 4.1] years, Body Surface Area [BSA]: [1.9 ± 0.2] m 2 , body fat: 11.8% ± 3.4%) versus [vs] healthy ( n  = 20, Age: [25.1 ± 4.4] years, BSA: [2.0 ± 0.3] m 2 , body fat: 10.8% ± 4.5%). For each athlete, prior to cardiopulmonary exercise testing (CPET), body composition, spirometry, and lactate blood levels, were recorded. Differences between groups were assessed with the independent samples t -test ( p  < 0.05). Several differences were detected between the two groups: ventilation ( V ˙ E : Resting: [14.7 ± 3.1] L·min -1 vs. [11.5 ± 2.6] L·min -1 , p  = 0.001; Maximal Effort: [137.1 ± 15.5] L·min -1 vs. [109.1 ± 18.4] L·min -1 , p  < 0.001), ratio V E /maximal voluntary ventilation (Resting: 7.9% ± 1.8% vs. 5.7% ± 1.7%, p  < 0.001; Maximal Effort: 73.7% ± 10.8% vs. 63.1% ± 9.0%, p  = 0.002), ratioV E /BSA (Resting: 7.9% ± 2.0% vs. 5.9% ± 1.4%, p  = 0.001; Maximal Effort: 73.7% ± 11.1% vs. 66.2% ± 9.2%, p  = 0.026), heart rate (Maximal Effort: [191.6 ± 7.8] bpm vs. [196.6 ± 8.6] bpm, p  = 0.041), and lactate acid (Resting: [1.8 ± 0.8] mmol·L -1 vs. [0.9 ± 0.1] mmol·L -1 , p  < 0.001; Maximal Effort: [11.0 ± 1.6] mmol·L -1 vs. [9.8 ± 1.2] mmol·L -1 , p  = 0.009), during CPET. No significant differences were identified regarding maximal oxygen uptake ([55.7 ± 4.4] ml·min -1 ·kg -1 vs. [55.4 ± 4.6] ml·min -1 ·kg -1 , p  = 0.831). Our findings demonstrate a pattern of compromised respiratory function in post-COVID-19 athletes characterized by increased respiratory work at both rest and maximum effort as well as hyperventilation during exercise, which may explain the reported increased metabolic needs., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2022 Chengdu Sport University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.)

Background: The purpose of our study was to investigate early differences in the adolescent female finswimmers' echocardiography parameters, possibly associated with different swimming-style training and different training equipment (monofin (MF) versus bifin (BF))., Method: Forty-three female finswimmers participated in our study (age: 15.6 ± 2.1 years, body mass index: 20.4 ± 2.2 kg/m², body surface area: 1.56 ± 0.04 m², body fat: 11.2 ± 0.6%) and were divided into two groups, according to the swimming style practiced (MF vs BF). Anthropometric characteristics, echocardiography and arterial pressure were measured. The independent t -test was used for statistical comparisons between groups. Stepwise multivariate regression analysis was applied to investigate associations between various variables., Results: The two groups used training equipment with different weights ( p < 0.001). Female adolescent finswimmers presented signs of myocardial hypertrophy depicted by the increased left ventricle myocardial mass indexed to body surface area (101.34 ± 23.65). Different patterns of myocardial hypertrophy were observed for the two groups; MF swimmers presented concentric hypertrophy, while BF swimmers presented eccentric hypertrophy (relative wall thickness MF = 0.46 ± 0.08 vs BF = 0.39 ± 0.06 cm, p < 0.05). MF swimmers had also higher left ventricular posterior wall diameters ( p < 0.05), lower stroke volume values ( p < 0.05) and lower ejection fraction ( p < 0.05) compared to BF athletes., Conclusion: Adolescent female finswimmers presented different patterns of myocardial hypertrophy possibly related to different training protocols and modes of exercise.