Iskanje po repozitoriju

Opis: This study explored the changes in the rate of torque development scaling factor (RTD-SF) and maximum voluntary isometric contraction (MVC) variables following six weeks of unilateral isometric electromyostimulation (EMS) and voluntary (VOL) exercises. Twenty-six physically active participants were randomly assigned to EMS (n = 13) or a VOL group. MVC and RTD-SF of the quadriceps femoris of both legs were assessed before and after training. EMS and VOL exercises had identical frequency (three sessions/week), intensity (60% MVC), volume (40 contractions), and work-to-rest ratio (18 min: 6.25 s of work/20 s of rest). There were no between-group differences for the trained leg with overall increases in maximal torque (Tmax) of ~29% (d = 2.11–2.12), ~13% for RTDmax (d = 0.92–1.10); ~23% for Intercept (d = 0.72–0.78), and reduction in RTD-SF by ~15% (d = 1.01–1.10). In the non-trained leg, significant moderate change was only observed after EMS for RTD-SF which decreased by 12.5% (d = 0.76)
Ključne besede: quadriceps, strength, RTD-SF, RFD-SF, EMS
Objavljeno v RUP: 14.01.2026; Ogledov: 136; Prenosov: 0
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Opis: Introduction: This study investigated whether velocity-based resistance training provides additional benefits to lower limb performance compared to standard exercise execution. Methods: Twenty untrained adult women (37–55 years) were randomly assigned to two resistance training groups to perform resistance training with three sets of four lower body exercises per week for 6 weeks. The number of repetitions and lifting velocity differed between the groups. One group performed lower body exercises with maximal intent and a 10% velocity loss threshold termination (VB10%; n = 10), while the other group performed 10 repetitions at a standard 1:2 s concentric:eccentric tempo (STD; n = 10). The number of repetitions was recorded during the sessions. Before and after the intervention, power, muscular endurance and dynamic stability of the lower limbs were assessed using the mean propulsive velocity (MPV) and power (MPP) at 70% one-repetition maximum in the squat and deadlift, the Y-balance test (YBT) and the 30-second sit-to-stand test (STS), respectively. A two-way analysis of variance was used to assess the effects of time, group, and their interaction. Results: The difference between 10 repetitions in the STD and repetitions in the VB10% was assessed using a one-sample t-test. Both groups significantly improved MPP, MPV, YBT and STS [mean difference (MD) ≥5.4%; effect size (ES) ≥0.6]. Although 2.5–2.7 less repetitions were performed in VB10%, the improvements in MPP and MPV were slightly greater (ES ≥ 1.2 vs. ≥ 0.8). Conversely, STS and YBT improved more in STD (ES ≥ 0.4 vs. ≥ 1.0). Discussion: Regardless of the lifting method used, the training intervention improved lower limb power, muscular endurance and dynamic stability, indicating that resistance training is an effective strategy for enhancing these capacities in untrained adult women. Using 10% threshold may be a more time-efficient strategy for improving lower-limb power in this population and could represent a promising approach for mitigating early declines in power over time.
Ključne besede: adult women, dynapenia, muscle performance, power, powerpenia, resistance training, strength, velocity loss
Objavljeno v RUP: 14.01.2026; Ogledov: 177; Prenosov: 2
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Opis: Background/Objectives: Childhood obesity remains a major global health challenge influenced by poor dietary patterns and excessive energy intake. Understanding gender-specific nutritional deviations may improve the effectiveness of preventive and therapeutic interventions. This study aimed to evaluate differences in energy and nutrient intake between boys and girls with overweight or obesity status and to identify the main food sources contributing to these differences. Methods: Data from a total of 180 participants (83 boys, 97 girls; 7–18 years) attending the national obesity intervention program Camp My Challenge was analyzed. Anthropometric parameters and dietary intake were assessed using a validated food-frequency questionnaire (OPKP). Intakes were compared with Slovenian dietary reference values (DRVs). Group differences were tested using ANOVA, t-tests, and Pearson correlations (p < 0.05). Results: Boys exhibited higher body mass (79.9 ± 22.6 kg vs. 69.2 ± 19.1 kg; p = 0.001) and BMI (30.8 ± 4.8 kg/m2 vs. 28.5 ± 4.4 kg/m2; p = 0.001). Mean energy intake was 2543 ± 1138 kcal/day, exceeding DRV by 16% (t = 3.31, p < 0.001). Girls exceeded energy requirements by 24.5% vs. 5.4% in boys (p = 0.019). Boys consumed significantly more total fat (106 ± 61 g vs. 85 ± 47 g; p = 0.014), saturated fatty acids (34 ± 20 g vs. 27 ± 13 g; p = 0.011), protein (119 ± 63 g vs. 98 ± 41 g; p = 0.008), and sodium (3628 ± 2086 mg vs. 2852 ± 1520 mg; p = 0.005). Girls showed higher sugar intake (208% vs. 166% of DRV; p = 0.032), mainly from sweet foods (24%) and fruit (26%), whereas beverages—predominantly isotonic drinks—accounted for 27% of boys’ sugar intake. Sugar intake correlated with waist circumference (r = 0.305, p = 0.002) and fat mass (r = 0.272, p = 0.007) in girls. Sodium intake exceeded DRV sixfold in both sexes. Conclusions: Marked sex-specific dietary disparities exist among children with obesity. Interventions should target high sugar and energy intake in girls and excessive fat, sodium, and sugar-sweetened beverage consumption in boys to enhance the efficacy of pediatric obesity management.
Ključne besede: childhood obesity, nutrition, dietary, sex-specific
Objavljeno v RUP: 10.01.2026; Ogledov: 141; Prenosov: 0
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Opis: Female reproductive hormones such as progesterone and estrogen play an important role in the body as they orchestrate functions of numerous cells including skeletal muscle cells. Onset of menses marks the beginning of reproductive life, whereas menopause marks its cessation. We distinguish three phases of the 28-day menstrual cycle namely follicular, ovulatory and luteal phases. The follicular phase is characterised by marked increases in estrogen, which triggers ovulation. During this phase, estrogen peaks, whereas progesterone levels are low. Following ovulation, the luteal phase commences marked by high progesterone levels and reduced estrogen. Indeed, these periodic fluctuations in reproductive hormones may affect rates of muscle protein synthesis and hence hinder sought adaptations such as skeletal muscle hypertrophy in female athletes. With the introduction of hormonal contraceptives, female athletes were able to have ameliorate the negative effects of the menstrual cycle by reducing menstrual cramping and bleeding. Hormonal contraceptives are constituted of a single or multiple synthetic hormones namely estrogen and progestin. Nevertheless, the impact of hormonal contraceptives on skeletal muscle hypertrophy remains elusive. In this review, we aim to present the potential implications of hormonal contraceptives on skeletal muscle hypertrophy.
Ključne besede: hormonal contraceptives, estrogen, progesterone, muscle hypertrophy, menstrual cycle, resistance training
Objavljeno v RUP: 07.01.2026; Ogledov: 155; Prenosov: 13
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Ključne besede: vadba za krepitev stopala, medprstni pripomoček, hallux valgus, obseg giba, posturalna stabilnost, magistrske naloge
Objavljeno v RUP: 02.01.2026; Ogledov: 154; Prenosov: 6
Celotno besedilo (2,19 MB)