FULL TEXT - Antropomotoryka
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FULL TEXT - Antropomotoryka
ROZPRAWY I ARTYKUŁY - - - - - DISSERTATIONS AND ARTICLES NR 31 AN TRO PO MO TO RY KA 2005 WPLYW DOJRZEWANIA PŁCIOWEGO NASTOLATEK NA ICH ROZWÓJ FIZYCZNY I REGULACJĘ AUTONOMICZNĄ SERCA THE INTERRELATIONSHIP BETWEEN ADOLESCENT GIRL’S PHYSICAL DEVELOPMENT, BIOLOGICAL PUBERTY AND HEART RHYTHM REGULATION DURING THE ADOLESCENCE PERIOD Algis Kepežėnas**, Gediminas Varoneckas*, Audronis Vilkas** * prof.dr hab., Institute of Psychophysiology and Rehabilitation, Kaunas University of Medicine **assoc.prof.dr.,Vilnius pedagogical university, [email protected] Słowa kluczowe: dojrzewanie płciowe, dojrzałość biologiczna, rytm serca, rozwój fizyczny Key words: puberty, biological development, heart rhythm, physical development. Cel pracy. Celem pracy jest określenie i ocena wpływu dojrzewania płciowego dziewcząt będących w tym samym wieku kalendarzowym na ich rozwój fizyczny i regulację autonomiczną rytmu serca. Materiał i metody. U czterdziestu dziewcząt w wieku 13-14 lat określono stopień dojrzałości biologicznej na podstawie oceny rozwoju drugorzędnych cech płciowych. Dokonano również pomiaru dwóch podstawowych cech somatycznych, wysokości (cm) i masy ciała (kg). Do oceny rytmu serca stosowano metodę rytmografii, określając częstotliwość rytmu (RF), dyspersję rytmu (RD) oraz trzy wskaźniki częstości absolutnych fal: bardzo niskiej (VLFC), niskiej (LFC), wysokiej (HFC), a także znaczenie procentowe tych fal w spoczynku (NVLFC, NHFC, RFB). Podczas wykonywania próby ortostatycznej rejestrowano maksymalne przyrosty częstotliwości rytmu w pozycji stojącej RR i znaczenie amplitudy ∆RRB. Reakcję układu krążenia na standartowe obciążenie fizyczne oceniano w jednostkach testu Ruffiera. Wyniki badań. Najniższą wysokością i masą ciała odznaczały się dziewczęta będące w pierwszym okresie dojrzewania płciowego. Starsze biologicznie były wyższe i cięższe. Różnice międzygrupowe w poziomie rozwoju wysokości ciała nie były jednak znaczące (p > 0,05). Tylko wyższa masa ciała dziewcząt, znajdujących się w drugim i trzecim okresie dojrzewania płciowego różniła się istotnie statystycznie (p < 0,05) od stwierdzonej u najmłodszych pod względem dojrzałości biologicznej. Nie wystąpił istotny statystycznie zakres zróżnicowania poziomu rozwoju ww. cechy somatycznej w grupie badanych wyróżnionych ze względu na najwyższy i średni poziom rozwoju drugorzędnych cech płciowych. Podobne prawidłowości wystąpiły w rozwoju funkcjonalnym. Można sądzić, że chociaż wiek metrykalny dziewcząt z wszystkich grup był identyczny, to wcześniejsze dojrzewanie płciowe – odnotowane w grupie trzeciej – powodowało określone zmiany metabolizmu organizmu i jego aktywację, w wyniku których zaszły ewidentne zmiany somatyczne, w związku z czym, dziewczęta z grupy o przyspieszonym rozwoju płciowym (3.grupa) były wyższe i cięższe od młodszych biologicznie (grupa 1 i 2). Wskaźniki rytmu serca rejestrowane w spoczynku i w czasie wykonania próby wysiłkowej obrazują odmienną tendencję. Wolniejszy rytm i większą jego rozpiętość stwierdzono w grupie dziewcząt o późniejszym dojrzewaniu płciowym (1gr.), natomiast przyśpieszony i bardziej stabilny rytm pracy serca odnotowano u badanych, które były w trzecim stadium rozwoju drugorzędnych cech płciowych. Zasadne jest przypuszczenie, iż przyspieszony rozwój fizyczny (wskaźników somatycznych) w okresie wcześniejszego dojrzewania nie idzie w parze z formowaniem się układów funkcjonalnych organizmu. Najczęściej jest ono opóźnione w relacji do poziomu rozwoju cech somatycznych. Przedstawione wyniki badań wskazują, że przyspieszony i bardziej stabilny - - - - STRESZCZENIE • SUMMARY - – 17 – . Algis Kepeženas, Gediminas Varoneckas, Audronis Vilkas rytm serca u dziewcząt charakteryzujących się wcześniejszym dojrzewaniem płciowym (3 gr.) może świadczyć pośrednio o ich niższej wydolności funkcjonalnej serca i układu naczyniowego w stosunku do grupy dziewcząt o późniejszym dojrzewaniu płciowym. Wnioski. Rezultaty badań własnych mogą świadczyć, że u badanych dziewcząt, będących w różnych okresach dojrzewania płciowego, w ich autonomicznym układzie nerwowej regulacji rytmu serca biorą udział w niejednakowym stopniu parasympatyczne i sympatyczne ośrodki wegetatywnego układu nerwowego. W grupie dziewcząt o późniejszym okresie dojrzewania płciowego (1 gr.), stosunek udziału ośrodków parasympatycznych i sympatycznych w przybliżeniu jest jednakowy, natomiast w grupie 2 i szczególnie u dziewcząt będących we wcześniejszym okresie dojrzewania płciowego (3 gr.), jest wyraźniejsze wahanie intensywności nerwowego układu sympatycznego na tle zmniejszonej parasympatycznej aktywacji nerwowej . The aim of the work. The objective is to investigate and to evaluate the impact of the puberty level of sameage adolescent girls (belonging to the age group of 13-14 years) on the level of their physical development and autonomous control of the heart rhythm. The material and methods. The research involved 40 participant girls aged 13-14. The level of the girls’ biological puberty was distinguished according to their puberty stages by estimating changes of secondary sexual features. Two parameters of physical development were recorded during the research – the height (in cm) and the body mass (in kg). To estimate heart rhythm characteristics, we used the rhythmography method that included distinction of rhythm frequency (RF), rhythm dispersion (RD), absolute values of very low frequency waves (VLFC), low frequency waves (LFC) and high frequency waves (HFC) as well as percentage values of the same waves (NVLFC, NLFC, NHFC) in a lying position at rest. During active orthostatic test, we estimated the maximum increase of rhythm frequency during stand-up (RRB) as well as the amplitude value (ΔRRB). The response of the heart rhythm towards standard physical load was estimated using percentile measurement units of the Ruffier Test. The results. The results indicate that the parameters of both height and body mass were the lowest in the first puberty stage group. The height parameters differ little, and differences in all the groups investigated are statistically unreliable (p>0.05). A comparison of the research participants’ body mass parameters indicates that the girls belonging to the first group, i.e. the first puberty stage, have lower body mass with statistically relevant results (p<0.05) than those belonging to the second and third puberty stage groups. Those from the third puberty stage group have the highest body mass parameters, yet they are not different with enough statistical relevance from the parameters of those belonging to the second group (p>0.05).The results also allow us establishing that girls belonging to the group of earlier puberty (group 3) overtake those whose puberty is later (groups 1 and 2) by their physical development parameters, especially, the body mass parameters. It is likely that, despite similar ages of the girls from all the groups, the puberty of group 3 girls, which began earlier, highly activated their metabolism; therefore, their physical development was faster. Although group 3 girls, whose puberty has started earlier, are highly ahead of later puberty group girls (groups 1 and 2), we can notice a contrary tendency when analyzing the heart rhythm parameters obtained while at rest and during functional sampling. An analysis of heart rhythm dispersion (RD) parameters indicates that the greatest RR interval dispersion is typical of the first group investigated (SRR=48.15±3.72 ms) and the third group (SRR=38.73±3.03 ms). Yet SRR parameter differences are not statistically relevant (p>0.05). Conclusions. An analysis of heart rhythm frequency (RF) and rhythm dispersion (RD) parameters show that the lowest rhythm frequency and the highest dispersion is typical of the first puberty stage girls (group 1) whose puberty started later. Meanwhile, the highest and most stable heart rhythm is typical of the girls belonging to the highest puberty stage (group 3). As can be seen from the research results, faster physical development related to early beginning of puberty leaves behind the development of the basic biological systems; they as if “lag behind” and develop slower. Our results show that more frequent and more stable heart rhythm typical of the girls whose puberty starts earlier (group 3) is an indirect manifestation of lower functional capacity of their cardiovascular system in comparison with those belonging to groups of slower and later puberty. In the process of child and adolescent physical education and sports activities, particular attention should be paid to controlling and estimating physical status of schoolchildren who do and do not go in for sports, as this later determines their sports orientation and their ways of trying to achieve high sport results [1]. Development of functional systems of an adolescent’s body is related to the process of growth and biological development; it continues until full maturity is achieved [2]. A growing and maturing body undergoes quantitative, qualitative and differential integral changes, which involve somatic morphology, functions and motorics [3, 4, 5]. An analysis of literary sources indicates the significance of the child, adolescent and youth education problem, - - - - Introduction - – 18 – The Interrelationship Between Adolescent Girl‘s Physical Development Biological Puberty... especially during the puberty period, when hormonal and psychophysical status of the body is being formed. The puberty process impacts individual development and manifests its own peculiarities [6, 7]. Qualitative and Quantitative changes of bodily functions happening in the said developmental period are related with the peculiarities of autonomic heart rhythm control during puberty. Research works devoted to heart rhythm variability in the aspects of sex, physical status of the body and organism adaptation to physical loads indicate that estimation of autonomic heart rhythm control according to heart rhythm variability allows quite objective judgements on the functional status of the cardiovascular system and its possibilities to adapt to physical loads [8, 9, 10, 11, 12]. Nevertheless, the authors have not found any data in literary sources on the relationship between the level of autonomic heart rhythm control and physical capacity, depending on adolescents’ biological development level. The aforementioned factors are important in optimisation of physical loads during sports exercising in the puberty period. It is believable that estimation of cardiovascular system functional status according to the level of autonomic heart rhythm control and determining adolescent puberty phases will be helpful in optimising the exercising process and in avoiding of possible over-exercising. The aim of the present work is to investigate and to estimate puberty level of same-age (13–14 year old) girls as well as its impact on physical development level and autonomic control of heart rhythm. The experiment involved 40 adolescent girls aged 13 – 14 and selected according to puberty phases. The research was carried out at Geroji Viltis Secondary School in Vilnius City. The girls’ puberty phases were determined using the method of estimating the level of development of secondary sexual characteristics [13]. We recorded two parameters of physical development – the height (cm) and body mass (kg). On the basis of puberty, three groups of the research participants were distinguished and formed. The first group consisted of girls whose puberty started late and who were in the first puberty phase (n=13), the second group included girls having normal puberty and belonging to the second phase (n=12), and group three consisted of third-phase (early puberty) girls (n=15). Results The parameters of heart rhythm variability while at rest and heart rhythm reaction to functional tests typical of research participants of the same age but belonging to different puberty phases and having different levels of physical development are presented in Table 1. An analysis of physical development level parameters indicates that both height and body mass parameters are the lowest in the group of girls belonging to the first puberty phase. Height parameters differ to a small extent, and differences among all the groups researched are not statistically significant (p > 0.05). A comparison of body mass parameters among groups shows that group 1 girls (i.e. those belonging to the first puberty phase) have lower body mass with statistical significance (p < 0.05) than those belonging to the second and third puberty groups. Third puberty phase girls’ body mass parameters are the highest, yet their difference from the parameters typical of group 2 girls is not statistically significant (p > 0.05). An overview of physical development parameter analysis allows stating that girls belonging to the group of faster puberty (group 3) have higher physical development parameters than those belonging to slower puberty groups (2 and 3), especially in terms of body mass. It is likely that earlier beginning of group 3 girls’ puberty activated their metabolism processes to a greater extent, thus accelerating their physical development, despite the similar ages of all the research participants. Although according to physical development parameters girls belonging to the faster puberty group (3) overtake those belonging to later puberty groups (2 and 3), an analysis of the obtained heart rhythm parameters recorded while at rest and du- - - - - Material and research methods To estimate heart rhythm characteristics, we used the rhythmography methods related to determination of rhythm frequency (RF), rhythm dispersion (RD) and absolute values of very low frequency (VLFC), low frequency (LFC) and high frequency components (HFC) in the heart rhythm spectre as well as percentile values (NVLFC, NLFC, NHFC) of the same components in the lying position at rest. While performing active orthostatic sampling, we determined maximal increase of heart rhythm during stand-up (RFB) and the amplitude value ( RFB). Heart rhythm reaction to standard load was estimated using the Roufier test relative measurement units. - – 19 – - - - - – 20 – – – p 1:3 p 2:3 – – – <0,05 <0,05 – – ± 1,95 ± 1,70 ± 0,13 48,87 ±1,37 162,6 ±2,03 ±0,16 47,42 ±1,40 43,23 3 (kg) Weight 13,67 162,08 ±1,78 ±0,15 13,58 159,38 2 1 13,54 (cm) Inch (years) Age p 1:2 3 (n=15) 2 (n=12) 1 (n=13) partys Searching – <0,025 – ± 16,08 675,8 ±17,13 707,2 28,51 761,5 4 (ms) RF – – – ± 3,03 38,73 ±2,16 40,33 ±3,72 48,15 5 (ms) RD – – – ± 1,96 21,47 ± 0,95 18,25 ±1,39 20,69 6 (ms) VLFC – <0,025 <0,025 ± 2,21 18,93 ± 1,50 19,33 ±3,25 29 7 (ms) LFC <0,01 <0,05 – – ± 4,76 35,53 ± 2,33 22,92 ±1,94 20,15 9 (%) NVLFC – – ± 2,81 23,8 ± 1,32 26,33 ±2,44 30,77 8 (ms) HFC – – <0,01 ± 3,93 25,13 ± 2,66 24,33 ±2,85 35,15 10 (%) NLFC – – – ± 5,41 39,33 ± 3,22 52,75 ±3,92 44,69 11 (%) NHFC – <0,01 – ± 9,20 450,13 ± 10,48 464 ±8,94 490,92 12 (%) RFB – – – ± 13,33 225,47 ± 12,13 243,17 ±25,64 271,38 13 (%) ΔRFB – <0,05 – ± 0,90 12,08 ± 0,68 11,05 ±0,83 9,35 14 (s.vnt.) IR Table 1. The data of teenage girls physical development and the variability of hearth rhythm while lying and the reactions of rhythm to functional tests on the first (1gr) second (2gr) and third (3gr) stages of sexual maturity (Average ± diversion) and the reliability of the difference (p). - . Algis Kepeženas, Gediminas Varoneckas, Audronis Vilkas ring functional tests indicates contrary tendencies. After having performed a comparison between heart rhythm frequency parameters of all the three groups in a horizontal position while at rest we see that the lowest heart rhythm frequencies are typical of slowest puberty group girls (group 1), i.e. the longest average RF intervals (RF = 761.54 ± 28.51 ms) are typical of group 1, while the highest heart rhythm frequency is observed in the fastest puberty group (group 3), where average RF intervals are the shortest (RF = 675.80 ± 16.08 ms) and differ from group 1 results with statistical significance (p < 0.025). The RF parameters obtained in the second group of research participants in a horizontal position while at rest are in between those of group 1 and group 3, yet there is no statistical significance (p > 0.05). An analysis of heart rhythm dispersion (RD) parameters indicates that the highest RF interval inequality is noticeable in the first group of research participants (RD = 48.15 ± 3.72 ms). Meanwhile, the third group results are (RD = 38.73 ± 3.03 ms). Yet RD parameter differences among all the groups analysed are not statistically significant (p > 0.05). An overview of heart rhythm frequency (RF) and rhythm dispersion (RD) analysis results indicates that the lowest rhythm frequency and the highest rhythm dispersion are typical of the slowest puberty group of the participating girls (group 1), while the most frequent and stable rhythm is observed in the group of the fastest puberty (phase 3). We can notice that faster physical development during early puberty leaves behind the development of the main functional systems of the body, and they as if “lag behind” and develop slower. As can be seen from our experimental results, more stable and more frequent heart rhythm of faster puberty (group 3) girls indirectly reflects lower functional capacity of their cardiovascular systems in comparison with those whose puberty is slower. A spectral analysis of heart rhythm indicates that absolute values (in ms) of very low frequency components (VLFC) differ little among the research participant groups (p > 0.05). Faster puberty group of girls (group 3) has VLFC parameter values higher than those obtained in other groups (VLFC = 21.47 ± 1.96 ms). Meanwhile, the lowest values of the aforementioned parameters are observed in group 2 (VLFC = 18.25±0.95 ms). A comparison of percentile slowest period wave parameters shows that this component takes the greatest percentile part in the heart rhythm spectre in the early puberty group of girls, i.e. group 3 (NVLFC = 35.53 ± 4.76 %), while it is the lowest in the late puberty group, i.e. group 1 (NVLFC = 20.15 ± 1.94%). The NVLFC percentile parameter of group 3 girls is higher with statistical significance than those obtained in groups 2 (p < 0.05) and 1 (p < 0.01). Meanwhile, absolute values of the low frequency component (LFC) reflect a contrary situation. The parameter of the waves belonging to this period has the highest value in the late puberty group, i.e. group 1 (LFC = 29.00 ± 3.25 ms). At the same time, it manifests the lowest values in group 3 – the early puberty group (LFC = 18.93 ± 2.21 ms). We should stress that the LFC parameter value obtained in group 1 is lower with statistical significance (p < 0.025) than the LFC values obtained in groups 2 and 3. The percentile part of waves belonging to this period (NVLFC) also has the highest values in group 1, i.e. the group of the slowest puberty (NLFC = 35.15 ± 2.85%), while it is much lower in groups 2 and 3, although it only differs with statistical significance from that obtained in group 2 (p < 0.01). High frequency component values, both absolute and percentile, manifest no statistically significant differences among the research participant groups (p > 0.05). An overview of the differences in both absolute and percentile parameters of the power spectrum among the groups of girls belonging to different puberty phases during the all periods allows stating that the parasympathetic and sympathetic control have different impact on the heart rhythm. Parasympathetic and sympathetic sections of the autonomic nervous system have approximately equal influence on heart rhythm control in slowest puberty girls (group 1), dominance of the sympathetic control was observed in the group 2 and especially group 3 containing the girls whose puberty is the fastest. Functional test parameters, i.e. those recorded during active orthostatic test and during the Roufier test are the best in group 1 – the slow puberty group (RFB=490.92±8.94 ms; ΔRFB=271.38±25.64 ms; IR=9.35±0.83 s per unit). Meanwhile, they are the worst in group 3, i.e. the group of faster puberty (RFB=450.13±9.20 ms; ΔRFB=225.47±13.33 ms; IR=12.08±0.90 s per unit). Statistically significant RFB differences can only be noticed when comparing groups 1 and 3 (p<0.01). ΔRFB parameter differences among the groups are lower and have no statistical significance (p>0.05), while IR parameters, as well as ΔRFB parameters, only differ with statistical significance when comparing groups 1 and 3. Conclusions 1. The lowest heart rhythm frequency and mostly expressed hearth rhythm responses to orthosta- - - - - The Interrelationship Between Adolescent Girl‘s Physical Development Biological Puberty... - – 21 – . Algis Kepeženas, Gediminas Varoneckas, Audronis Vilkas tic test and standard physical load as well as the best Rouffier Index was observed in girls with later sexual puberty. 2. In the process of junior sportsmen selection and training, it is mandatory to establish their level of puberty according to the stages of their sexual maturity. Such distinction would be helpful in avoiding inadequate impact of physical loads on adolescents’ organisms. 3. 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Genetic of fit- - – 22 –