Browsing by Author "Ereline, Jaan"

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    Changes in EMG and H-reflex characteristics of knee flexor muscles for athletes under the influence of central neural regulation
    (2021-03) Varpa, Normunds; Paeglītis, Alvis; Galeja, Zinta; Paasuke, Mati; Ereline, Jaan; Gapeyeva, Helena; Kums, Tatjana; Latvian Academy of Sport Education (LASE)
    Applied kinesiology (AK) diagnostic test is a manual muscle testing and technique widely used within the Integrative Medical community by sports doctors and sports physiotherapists. Empirically defined functionally weak muscles are the cause of a particular dysfunction of the organism, but it is not clear if there are physiological findings. Objective: Does a functionally altered state of central neural regulation (CNR) affect H-reflex and EMG characteristics? Material and methods: 34 (16 H-reflex measurements and 18 EMG measurements) healthy LASE students, 21± 0.3 years old, average height - 174 ± 2 cm and the average weight – 63±2 kg, was performed EMG and H-reflex measurements in normal and altered CNR functional states was done on the muscles of the gastrocnemius (GM) and biceps femoris (BF). Results: statistically significant changes (p<.05; .01) are observed in EMG and H-reflex characteristics in normal and altered CNR functional states. Conclusion: there are tendencies that a qualitatively assessed CNR condition can be assessed by quantitative measurements. The groups have a small number of participants, so research in this field should be continued.
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    Pre-practice hydration status in soccer (football) players in a cool environment
    (2018-12-05) Kiitam, Urmo; Voitkevica, Lilita; Timpmann, Saima; Pontaga, Inese; Ereline, Jaan; Unt, Eve; Ööpik, Vahur; Department of Anatomy, Physiology, Biochemistry, Biomechanics, Hygiene and Informatics
    Background and Objectives: Only a few studies have reported the pre-practice hydration status in soccer players (SPs) who train in a cool climate. The primary purpose of this study was to examine the hydration status of male semiprofessional SPs immediately before their regular training session in winter. The secondary purpose was to compare the urinary indices of the hydration status of Estonian and Latvian SPs. Materials and Methods: Pre-training urine samples were collected from 40 Estonian (age 22.1 ± 3.4 years, soccer training experience 13.7 ± 3.9 years) and 41 Latvian (age 20.8 ± 3.4 years, soccer training experience 13.3 ± 3.0 years) SPs and analyzed for urine specific gravity (USG). The average outdoor temperature during the sample collection period (January-March) was between -5.1 °C and 0.2 °C (Estonia) and -1.9 °C and -5.0 °C (Latvia). Results: The average pre-training USG of Estonian and Latvian SPs did not differ (P = 0.464). Pooling the data of Estonian and Latvian SPs yielded a mean USG value of 1.021 ± 0.007. Hypohydration (defined as a USG ≥ 1.020) was evident altogether in fifty SPs (61.7%) and one of them had a USG value greater than 1.030. Conclusions: Estonian and Latvian SPs do not differ in respect of USG and the prevalence of pre-training hypohydration is high in this athletic cohort. These findings suggest that SPs as well as their coaches, athletic trainers, and sports physicians should be better educated to recognize the importance of maintaining euhydration during the daily training routine in wintertime and to apply appropriate measures to avoid hypohydration.