The purpose of the present study was to investigate the effect of a tennis training session on the balance performance of young tennis players. The study was conducted on 36 elite tennis players (age 14 +/- 2 years; body mass 55 +/- 6 kg; body height 165 +/- 6 cm; mean +/- SD) participating in the national young tennis championship. Balance performance was assessed before and immediately after a tennis training session (pre-training and post-training, respectively). The balance assessment was performed with 2 different balance boards and the Biodex Stability System. In addition, dynamometric measurements of peak isokinetic moment in the knee flexors and extensors were performed pre and post tennis training session, to quantify the degree of muscle fatigue induced by the tennis training session. One-way analysis of variance with repeated measures was used to test for differences in balance performance and in isokinetic performance between pre and post tennis training session. The data analysis revealed no significant differences (p > 0.05) in balance performance, whereas there were significant differences in knee joint moment production between pre and post tennis training measures. Although the tennis training session of the present study had no significant effect (p > 0.05) on any of the balance performance indicators examined, there was a decline in balance performance, which suggests that different level of fatigue for an extended period (games) will have greater effect on balance performance. It is suggested that a tennis-specific balance exercise program should be included in the tennis training session.
The Hellenic Heart Failure Association has undertaken the initiative to develop a national network of heart failure clinics (HFCs) and cardio‐oncology clinics (COCs). We conducted two questionnaire surveys among these clinics within 17 months and another during the coronavirus disease 2019 outbreak to assess adjustments of the developing network to the pandemic. Out of 68 HFCs comprising the network, 52 participated in the first survey and 55 in the second survey. The median number of patients assessed per week is 10. Changes in engaged personnel were encountered between the two surveys, along with increasing use of advanced echocardiographic techniques (23.1% in 2018 vs. 34.5% in 2020). Drawbacks were encountered, concerning magnetic resonance imaging and ergospirometry use (being available in 14.6% and 29% of HFCs, respectively), exercise rehabilitation programmes (applied only in 5.5%), and telemedicine applications (used in 16.4%). There are 13 COCs in the country with nine of them in the capital region; the median number of patients being assessed per week is 10. Platforms for virtual consultations and video calls are used in 38.5%. Coronavirus disease 2019 outbreak affected provision of HFC services dramatically as only 18.5% continued to function regularly, imposing hurdles that need to be addressed, at least temporarily, possibly by alternative methods of follow‐up such as remote consultation. The function of COCs, in contrast, seemed to be much less affected during the pandemic (77% of them continued to follow up their patients). This staged, survey‐based procedure may serve as a blueprint to help building national HFC/COC networks and provides the means to address changes during healthcare crises.
This study examined the effect of exercise mode and intensity on physiological and perceptual responses to exercise. Twelve active adults (6 men and 6 women, age 5 21.7 6 1.6 years) initially performed incremental testing on the treadmill (TM) and cycle ergometer (CE) to assess maximal oxygen uptake (V Ȯ2 max) and ventilatory threshold (VT). During the next 4 visits in a randomized order, subjects performed 20 minutes of moderate-intensity continuous exercise (MICE) at an intensity 20% below VT on the TM (TM MICE ) and cycle ergometer (CE MICE ) as well as time-matched high-intensity interval exercise (HIIE; 10 1-minute bouts at workload equal to 20% above VT followed by 1-minute active recovery) on both modes (TM HIIE and CE HIIE ). During exercise, gas exchange data, blood lactate concentration, and perceptual responses (rating of perceived exertion, affective valence, and enjoyment) were assessed. Heart rate (p , 0.001) and V Ȯ2 (p , 0.001) were higher in response to TM HIIE vs. CE HIIE as well as TM MICE vs. CE MICE . Blood lactate concentration was higher (p 5 0.003) in response to CE HIIE vs. TM HIIE . The rating of perceived exertion was significantly higher (p , 0.001) in TM MICE compared with CE MICE which showed the most positive affective valence (p 5 0.009). Enjoyment was similar across all bouts (p 5 0.11). Treadmill-based HIIE leads to higher heart rate and V Ȯ2 vs. CE HIIE , although there was no difference in affective valence or enjoyment. Practitioners aiming to optimize the cardiorespiratory response to moderate or interval exercise in their clientele should recommend TM running rather than cycling.
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