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  1. Article: Effects of Structured Physical Activity on Motor Fitness in Preschool Children.

    Kojić, Filip / Arsenijević, Radenko / Grujić, Gabrijela / Toskić, Lazar / Šimenko, Jožef

    Children (Basel, Switzerland)

    2024  Volume 11, Issue 4

    Abstract: The aim was to investigate the impact of a specific structured movement activities (SMA) program compared to free play activity (FRP) on the strength, speed, agility, coordination, and balance of motor fitness (MF) in 6-year-old boys and girls. A total ... ...

    Abstract The aim was to investigate the impact of a specific structured movement activities (SMA) program compared to free play activity (FRP) on the strength, speed, agility, coordination, and balance of motor fitness (MF) in 6-year-old boys and girls. A total of 53 children (24 boys, 29 girls) were randomly allocated to either the SMA group or the FRP group. Both group activities were administered three times a week over a 6-month period. MF variables were assessed before (pre-) and after (post-) using tests: the flamingo balance (FLA), the standing long jump (SLJ), plate tapping (PTT), the obstacle course backwards (OCB), and the shuttle run 4 × 5 m (SRT). At the post-test, the SMA program resulted in significant (
    Language English
    Publishing date 2024-04-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2732685-8
    ISSN 2227-9067
    ISSN 2227-9067
    DOI 10.3390/children11040433
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Relationship between hypertrophy, strength gains and tensiomyography adaptations: a moderator role of contraction duration.

    Kojić, Filip / Arsenijević, Radenko / Ilić, Vladimir / Đurić, Saša

    European journal of applied physiology

    2022  Volume 122, Issue 10, Page(s) 2223–2231

    Abstract: The aim of the study was to investigate how the relationship between resistance training-induced hypertrophy, strength, and passive contractile adaptations is affected by contraction duration. Twenty university students (11 males) were randomly assigned ... ...

    Abstract The aim of the study was to investigate how the relationship between resistance training-induced hypertrophy, strength, and passive contractile adaptations is affected by contraction duration. Twenty university students (11 males) were randomly assigned to either the fast eccentric/fast concentric phase group (F/F; 1 s both phases) or the slow eccentric/fast concentric phase group (S/F; 4 s and 1 s, respectively). Both experimental groups completed a 7-week biceps curl training programme with a total of 14 sessions (2 days/week). Elbow flexor muscle thickness (MT), one-repetition maximum (1RM), and tensiomyographic (TMG) parameters (radial displacement-D
    MeSH term(s) Humans ; Hypertrophy ; Male ; Muscle Contraction/physiology ; Muscle Strength/physiology ; Muscle, Skeletal/physiology ; Resistance Training
    Language English
    Publishing date 2022-07-13
    Publishing country Germany
    Document type Journal Article ; Randomized Controlled Trial
    ZDB-ID 124793-1
    ISSN 1439-6327 ; 1432-1025 ; 0301-5548 ; 1439-6319
    ISSN (online) 1439-6327 ; 1432-1025
    ISSN 0301-5548 ; 1439-6319
    DOI 10.1007/s00421-022-04998-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Resistance training induces similar adaptations of upper and lower-body muscles between sexes.

    Kojić, Filip / Mandić, Danimir / Ilić, Vladimir

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 23449

    Abstract: The purpose of the study was to compare sex adaptations in hypertrophy, strength and contractile properties of upper and lower-body muscles induced by resistance training (RT). Eighteen RT untrained male (MG) and female (FG) students (aged 24.1 ± 1.7 ... ...

    Abstract The purpose of the study was to compare sex adaptations in hypertrophy, strength and contractile properties of upper and lower-body muscles induced by resistance training (RT). Eighteen RT untrained male (MG) and female (FG) students (aged 24.1 ± 1.7 years, height: 1.75 ± 0.08 m, weight: 70.4 ± 12.3 kg) undervent 7 weeks of biceps curl and squat training (2 days/week, 60-70% repetition maximum, 3-4 sets, 120 s rest intervals, reps until muscular failure). At baseline and final measurement, thickness and cross-section area, one-repetition maximum and tensiomyography parameters (contraction time - Tc and radial displacement - Dm) of elbow flexors (biceps brachii) and knee extensors (4 quadriceps muscles) were evaluated. Although MG tends to display greater absolute strength gains for upper- (p = 0.055) and lower-body (p = 0.098), for relative changes ANCOVA revealed no sex-specific differences for either of the tested variables. Significant hypertrophy was observed for all tested muscles, except for vastus intermedius in FG (p = 0.076). The Dm significantly decreased for biceps brachii (MG by 12%, p < 0.01 and FG by 13.1%, p < 0.01) and rectus femoris (MG by19.2%, p < 0.01 and FG by 12.3%, p < 0.05), while Tc values remain unchanged. These results indicate that initial morphological, functional and contractile alterations following RT are similar for males and females, and that there are no specific sex adaptations either for the upper- or lower-body muscles. The study was registered with ClinicalTrials.gov (NCT04845295).
    MeSH term(s) Adaptation, Physiological/physiology ; Adult ; Elbow ; Exercise ; Female ; Humans ; Hypertrophy ; Knee ; Male ; Muscle Contraction/physiology ; Muscle Strength/physiology ; Muscle, Skeletal/physiology ; Myography ; Reproducibility of Results ; Resistance Training/methods ; Sex Factors ; Young Adult
    Language English
    Publishing date 2021-12-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-02867-y
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  4. Article: Quadriceps femoris cross-sectional area and specific leg strength: relationship between different muscles and squat variations.

    Kojic, Filip / Ðurić, Saša / Ranisavljev, Igor / Stojiljkovic, Stanimir / Ilic, Vladimir

    PeerJ

    2021  Volume 9, Page(s) e12435

    Abstract: Background: The aim was to determine the relationship between the cross-sectional area of the quadriceps femoris and strength performance in the deep and parallel barbell squat.: Methods: The sample included 16 university students (seven female, 24.1  ...

    Abstract Background: The aim was to determine the relationship between the cross-sectional area of the quadriceps femoris and strength performance in the deep and parallel barbell squat.
    Methods: The sample included 16 university students (seven female, 24.1 ± 1.7 years). Muscle strength was expressed as external load, including the one-repetition maximum and the body mass segments involved (calculated according to Dempster's method). The cross-sectional area of the quadriceps femoris muscles was determined using ultrasound, while leg muscle mass was measured using the Bioelectrical Impedance method.
    Results: The cross-sectional areas of the three vastii muscles and leg muscle mass showed moderate to strong correlation with external load in both squat types (
    Language English
    Publishing date 2021-11-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2703241-3
    ISSN 2167-8359
    ISSN 2167-8359
    DOI 10.7717/peerj.12435
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  5. Article ; Online: Physical activity and eating habits of students of the University of Belgrade

    Obradović Miloš / Nešić Goran / Popović Aleksandra / Božić Predrag / Savić Zoran / Kojić Filip / Đurić Saša

    Vojnosanitetski Pregled, Vol 78, Iss 12, Pp 1273-

    An epidemiological study

    2021  Volume 1279

    Abstract: Background/Aim. Numerous studies have indicated that university students exhibit a variety of risky health behaviors, such as the lack of regular physical activity and u n-healthy eating habits. Due to lack of information about students’ lifestyles in ... ...

    Abstract Background/Aim. Numerous studies have indicated that university students exhibit a variety of risky health behaviors, such as the lack of regular physical activity and u n-healthy eating habits. Due to lack of information about students’ lifestyles in Serbia, we designed a study with the following aims: 1) to investigate physical activity and eating habits variations of students according to gender, year of study and attended faculty; 2) to estimate the relationship between their physical activity and eating habits. Methods. The survey method was used. Data were collected in the 2016/2017 school year during the spring semester. The sample was randomly stratified (4,019 students of the University of Belgrade – 2,284 males), which corresponded to about 5% of the whole student population of the University of Belgrade. For data collection, two standardized questionnaires were used: International Physical Activity Questionnaire (IPAQ) and Youth/Adolescent Food Questionnaire (YAQ). Results. Male students were significantly more highly and moderately active than female students [3.15 vs. 2.80 days, respectively; p = 0.003, effect size (ES) = 0.651]. Correspondingly, female students were less active during the day (326 vs. 305 min; p = 0.044, ES = 0.232). Interaction between factors revealed that the most active on a weakly basis were fourth-year male students of the natural sciences (4.20 days), while on a daily basis, the most active were first-year female students (161 min). The most sedentary ones were third-year female students of medical sciences (475 min of sitting per day). Significant correlations were found between the duration of intense physical activity and consuming water, vegetables, citrus fruits, integral bread, and cereals. Conclusion. Female students were more prone to sedentary behavior, while older students were more active and aware of the importance of physical activity. Further-more, the nature of studies can influence the lifestyle. Female and older students were more concerned about diets. ...
    Keywords attitude to health ; exercise ; feeding behavior ; healthy lifestyle ; serbia ; students ; sex factors ; surveys and questionnaires ; Medicine (General) ; R5-920
    Subject code 796
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Military Health Department, Ministry of Defance, Serbia
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Does Back Squat Exercise Lead to Regional Hypertrophy among Quadriceps Femoris Muscles?

    Kojic, Filip / Ranisavljev, Igor / Obradovic, Milos / Mandic, Danimir / Pelemis, Vladan / Paloc, Milos / Duric, Sasa

    International journal of environmental research and public health

    2022  Volume 19, Issue 23

    Abstract: The present study investigated effects of squat resistance training on intermuscular hypertrophy of quadriceps femoris muscles (i.e., rectus femoris, RF; vastus intermedius, VI; vastus medialis, VM; and vastus lateralis, VL). Eighteen university students ...

    Abstract The present study investigated effects of squat resistance training on intermuscular hypertrophy of quadriceps femoris muscles (i.e., rectus femoris, RF; vastus intermedius, VI; vastus medialis, VM; and vastus lateralis, VL). Eighteen university students (age: 24.1 ± 1.7 years, 9 females) underwent 7 weeks of parallel squat training (2 days/week) preceded by a 2-week familiarization period. Squat strength (1RM) and cross-sectional area (CSA) of four quadriceps muscles were assessed at baseline and at the end of the study. At posttest, 1RM and CSA of quadriceps muscles significantly increased (p < 0.01), with moderate-to-large effect (ES = 1.25−2.11) for 1RM (8.33 ± 6.64 kg), VM CSA (0.12 ± 0.08 cm2), and VL CSA (0.19 ± 0.09 cm2) and small effect (ES = 0.89−1.13) for RF CSA (0.17 ± 0.15 cm2) and VI CSA (0.16 ± 0.18 cm2). No significant differences were found in the changes of CSA between muscles (F = 0.638, p = 0.593). However, the squat 1RM gain was significantly associated only with the changes in CSA of the VL muscle (r = 0.717, p < 0.001). The parallel squat resulted in significant growth of all quadriceps muscles. However, the novelty of this study is that the increase in strength is associated only with hypertrophy of the VL muscle.
    MeSH term(s) Female ; Humans ; Young Adult ; Adult ; Quadriceps Muscle/physiology ; Muscle, Skeletal/physiology ; Resistance Training/methods ; Hypertrophy ; Exercise Therapy
    Language English
    Publishing date 2022-12-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2175195-X
    ISSN 1660-4601 ; 1661-7827
    ISSN (online) 1660-4601
    ISSN 1661-7827
    DOI 10.3390/ijerph192316226
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  7. Article: Effects of resistance training on hypertrophy, strength and tensiomyography parameters of elbow flexors: role of eccentric phase duration.

    Kojić, Filip / Ranisavljev, Igor / Ćosić, Dušan / Popović, Dejana / Stojiljković, Stanimir / Ilić, Vladimir

    Biology of sport

    2021  Volume 38, Issue 4, Page(s) 587–594

    Abstract: The aim of the study was to compare the effects of two different training protocols, which differ in the duration of the eccentric phase, on the one-repetition maximum (1RM), thickness and contractile properties of elbow flexors. Twenty untrained college ...

    Abstract The aim of the study was to compare the effects of two different training protocols, which differ in the duration of the eccentric phase, on the one-repetition maximum (1RM), thickness and contractile properties of elbow flexors. Twenty untrained college students were randomly divided into two experimental groups, based on the training tempo: FEG (Faster Eccentric Group: 1/0/1/0) and SEG (Slower Eccentric Group: 4/0/1/0). Training intervention was a biceps bending exercise, conducted twice a week for 7 weeks. The intensity (60-70% RM), sets (3-4) and rest intervals (120 s) were held constant, while repetitions were performed until it was not possible to maintain a set duration. In the initial and final measurements, 1RM, muscle thickness and tensiomyography parameters - contraction time (Tc) and radial deformation (Dm) - were evaluated. An ANCOVA model (using baseline outcomes as covariates) was applied to determine between-group differences at post-test, while Pearson's product-moment correlation coefficient was used to investigate the relationship between absolute changes in muscle thickness and Dm. Muscle strength increase was greater for SEG than for FEG (6.0 ± 1.76 vs. 3.30 ± 2.26 kg, p < 0.01). In both groups muscle thickness increased equally (FEG: 3.24 ± 2.01 vs. SEG: 3.57 ± 1.17 mm, p < 0.01), while an overall reduction in Dm was observed (FEG: 1.99 ± 1.20 vs. SEG: 2.26 ± 1.03 mm, p < 0.01). Values of Tc remained unchanged. A significant negative relationship was observed between changes in muscle thickness and Dm (r = -0.763, Adj.R² = 0.560, p < 0.01). These results indicate that the duration of the eccentric phase has no effect on muscle hypertrophy in untrained subjects, but that slower eccentric movement significantly increases 1RM.
    Language English
    Publishing date 2021-01-14
    Publishing country Poland
    Document type Journal Article
    ZDB-ID 639281-7
    ISSN 0860-021X
    ISSN 0860-021X
    DOI 10.5114/biolsport.2021.99323
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    In stock of ZB MED Cologne/Königswinter

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