1,721,167 research outputs found
Relationships between internal training intensity, heart rate variability, sleep duration, and neuromuscular performance in professional soccer players
No full textPurpose. This study examined the relationship between internal training intensity and physiological and performance markers, including heart rate variability, resting heart rate, sleep duration, and countermovement jump performance in professional soccer players during a five-week preseason. Methods. This longitudinal design included 10 professional soccer players (age: 20.8 ± 2.3 years) with the following variables measured weekly: ITI, heart rate variability (HRV), resting heart rate (RHR), sleep duration, and countermovement jump (CMJ) performance. Results. Results showed a significant reduction in ITI (p < 0.001) across the preseason, reflecting effective intensity manage-ment. CMJ performance showed an initial decline before significantly increasing after week 2 (p < 0.001), while no significant changes were observed in RHRmean (p = 0.25) or lnRMSSDmean (p = 0.27). However, lnRMSSDCV decreased by 39.9%, indicating improved autonomic stability. A moderate negative correlation was observed between lnRMSSDmean and lnRMSSDCV (r = –0.54, p < 0.001), suggesting that greater parasympathetic tone is associated with reduced daily HRV fluctuations. ITI showed moderate negative correlations with Sleepmean (r = –0.32, p = 0.045) and CMJ performance (r = –0.43, p = 0.005) and a positive correlation with lnRMSSDCV (r = 0.35, p = 0.03). Conclusions. Higher ITI is associated with reduced CMJ performance, likely due to fatigue, emphasising the need to monitor CMJ for optimising training loads and preventing overtraining. Similarly, its link to shorter sleep duration highlights the importance of tracking sleep for effective recovery management. Additionally, the inverse relationship between lnRMSSDmean and lnRMSSDCV suggests that greater parasympathetic activity stabilises HRV fluctuations, reflecting improved autonomic balance and aiding in training adjustments. This study highlights the importance of integrating HRV, sleep, and CMJ into preseason training programs for professional soccer players. A tailored training approach emphasising reduced ITI and monitoring autonomic stability and recovery effectively improves physiological resilience and neuromuscular performance, ensuring players’ readiness for the competitive season
Sirkadiyen ritim, iskelet-kas metabolizması ve egzersiz ilişkisi: sağlık açısından değerlendirilmesi
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Gece açlığını takiben aç ve tok karnına yapılan akut sabah egzersizi ile sağlık arasındaki ilişkinin değerlendirilmesi
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The role of brain-derived neurotropic factor in obesity through appetite, and the relationship between acute-chronic exercise
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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