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  • 1
    Online Resource
    Online Resource
    Georg Thieme Verlag KG ; 2023
    In:  International Journal of Sports Medicine Vol. 44, No. 03 ( 2023-03), p. 199-205
    In: International Journal of Sports Medicine, Georg Thieme Verlag KG, Vol. 44, No. 03 ( 2023-03), p. 199-205
    Abstract: The combination of plyometric and resistance training (RT) is frequently used to increase power-related adaptations. Since plyometric training is most effective when athletes are in a well-rested state, the acute effect of RT on plyometric performance should be carefully considered. Thus, 15 highly trained males (23.1±3.5 yrs, 1.80±0.06 m, 79.1±7.9 kg) completed a load- and volume-matched velocity-based RT session with 10% velocity loss (VL10) and traditional 1-repetition maximum-based RT session to failure (TRF) in a randomized order. Repeated sprints (5 × 15 m), countermovement jumps (CMJs), and drop jumps (DJs) were measured before, immediately after, and 24 h after both sessions. Lactate, heart rate, and perceived effort (RPE) were measured. Sprint, CMJ, and DJ revealed significant interaction effects (rANOVA p 〈 0.001, ηp 2≥0.63). Immediately afterward, sprint, DJ, and CMJ were less negatively affected (p≤0.03, SMD≥|0.40|) by VL10 vs. TRF. Sprint and CMJ were already recovered 24 h post-testing and showed no significant differences between TRF and VL10 (p≥0.07, SMD≤|0.21|). Twenty-four hours post-testing, DJs were still reduced during TRF but already recovered during VL10 (p=0.01, SMD=|0.70|). TRF resulted in higher lactate, heart rate, and RPE compared to VL10 (p≤0.019, η p 2≥0.27, SMD≥|0.68|). In conclusion, the non-failure-based VL10 impairs jump and sprint performance less than the failure-based TRF approach, despite matched volume and intensity.
    Type of Medium: Online Resource
    ISSN: 0172-4622 , 1439-3964
    RVK:
    Language: English
    Publisher: Georg Thieme Verlag KG
    Publication Date: 2023
    detail.hit.zdb_id: 2041541-2
    SSG: 31
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  • 2
    Online Resource
    Online Resource
    Georg Thieme Verlag KG ; 2023
    In:  Sportphysio Vol. 11, No. 04 ( 2023-09), p. 163-168
    In: Sportphysio, Georg Thieme Verlag KG, Vol. 11, No. 04 ( 2023-09), p. 163-168
    Abstract: Wer wünscht sich nicht ein einfaches System zur Ermittlung der optimalen Trainingsbelastung? Herkömmliche Verfahren sind oft aufwendig, wenig objektiv und werden den Trainierenden wegen der unvermeidbaren Leistungsschwankungen oft nicht gerecht. Geschwindigkeitsbasiertes Krafttraining verspricht hier Abhilfe. Es ermöglicht eine relativ einfache Ermittlung der optimalen Trainingsparameter, verspricht gute Ergebnisse bei geringerer Ermüdung und lässt sich im Trainingsalltag leicht umsetzen.
    Type of Medium: Online Resource
    ISSN: 2196-5951 , 2196-596X
    Language: German
    Publisher: Georg Thieme Verlag KG
    Publication Date: 2023
    SSG: 31
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  • 3
    In: Journal of Sports Science and Medicine, Journal of Sports Science and Medicine
    Abstract: Chronic blood flow restriction (BFR) training has been shown to improve drop jumping (DJ) and balance performance. However, the acute effects of low intensity BFR cycling on DJ and balance indices have not yet been examined. 28 healthy young adults (9 female; 21.8 ± 2.7years; 1.79 ± 0.08m; 73.9 ± 9.5kg) performed DJ and balance testing before and immediately after 20min low intensity cycling (40% of power at maximal oxygen uptake) with (BFR) and without BFR (noBFR). For DJ related parameters, no significant mode × time interactions were found (p ≥ 0.221, ηp2 ≤ 0.06). Large time effects for DJ heights and the reactive strength index were observed (p 〈 0.001, ηp2 ≥ 0.42). Pairwise comparison revealed notably lower values for both DJ jumping height and reactive strength index at post compared to pre (BFR: -7.4 ± 9.4%, noBFR: -4.2 ± 7.4%). No statistically significant mode × time interactions (p ≥ 0.36; ηp2 ≤ 0.01) have been observed for balance testing. Low intensity cycling with BFR results in increased (p ≤ 0.01; SMD ≥ 0.72) mean heart rate (+14 ± 8bpm), maximal heart rate (+16 ± 12 bpm), lactate (+0.7 ± 1.2 mmol/L), perceived training intensity (+2.5 ± 1.6au) and pain scores (+4.9 ± 2.2au) compared to noBFR. BFR cycling induced acutely impaired DJ performance, but balance performance was not affected, compared to noBFR cycling. Heart rate, lactate, perceived training intensity, and pain scores were increased during BFR cycling.
    Type of Medium: Online Resource
    ISSN: 1303-2968
    Language: English
    Publisher: Journal of Sports Science and Medicine
    Publication Date: 2023
    detail.hit.zdb_id: 2075564-8
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  • 4
    In: European Journal of Sport Science, Informa UK Limited, Vol. 23, No. 8 ( 2023-08-03), p. 1622-1628
    Type of Medium: Online Resource
    ISSN: 1746-1391 , 1536-7290
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2038559-6
    SSG: 31
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  • 5
    In: Frontiers in Physiology, Frontiers Media SA, Vol. 14 ( 2023-2-16)
    Abstract: The time spent above 90% of maximal oxygen uptake ( V ̇ O 2 max) during high-intensity interval training (HIIT) sessions is intended to be maximized to improve V ̇ O 2 max. Since uphill running serves as a promising means to increase metabolic cost, we compared even and moderately inclined running in terms of time ≥90% V ̇ O 2 max and its corresponding physiological surrogates. Seventeen well-trained runners (8 females & amp; 9 males; 25.8 ± 6.8yrs; 1.75 ± 0.08m; 63.2 ± 8.4kg; V ̇ O 2 max: 63.3 ± 4.2 ml/min/kg) randomly completed both a horizontal (1% incline) and uphill (8% incline) HIIT protocol (4-times 5min, with 90s rest). Mean oxygen uptake ( V ̇ O 2 mean), peak oxygen uptake ( V ̇ O 2 peak), lactate, heart rate (HR), and perceived exertion (RPE) were measured. Uphill HIIT revealed higher ( p ≤ 0.012; partial eta-squared (pes) ≥ 0.351) V ̇ O 2 mean (uphill: 3.3 ± 0.6 vs. horizontal: 3.2 ± 0.5 L/min; standardized mean difference (SMD) = 0.15), V ̇ O 2 peak (uphill: 4.0 ± 0.7 vs. horizontal: 3.8 ± 0.7 L/min; SMD = 0.19), and accumulated time ≥90% V ̇ O 2 max (uphill: 9.1 ± 4.6 vs. horizontal: 6.4 ± 4.0 min; SMD = 0.62) compared to even HIIT. Lactate, HR, and RPE responses did not show mode*time rANOVA interaction effects ( p ≥ 0.097; pes ≤0.14). Compared to horizontal HIIT, moderate uphill HIIT revealed higher fractions of V ̇ O 2 max at comparable perceived efforts, heartrate and lactate response. Therefore, moderate uphill HiiT notably increased time spent above 90% V ̇ O 2 max.
    Type of Medium: Online Resource
    ISSN: 1664-042X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2564217-0
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  • 6
    Online Resource
    Online Resource
    MDPI AG ; 2021
    In:  International Journal of Environmental Research and Public Health Vol. 18, No. 17 ( 2021-08-31), p. 9170-
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 18, No. 17 ( 2021-08-31), p. 9170-
    Abstract: The accurate assessment of the mean concentric barbell velocity (MCV) and its displacement are crucial aspects of resistance training. Therefore, the validity and reliability indicators of an easy-to-use inertial measurement unit (VmaxPro®) were examined. Nineteen trained males (23.1 ± 3.2 years, 1.78 ± 0.08 m, 75.8 ± 9.8 kg; Squat 1-Repetition maximum (1RM): 114.8 ± 24.5 kg) performed squats and hip thrusts (3–5 sets, 30 repetitions total, 75% 1RM) on two separate days. The MCV and displacement were simultaneously measured using VmaxPro® and a linear position transducer (Speed4Lift®). Good to excellent intraclass correlation coefficients (0.91 〈 ICC 〈 0.96) with a small systematic bias (p 〈 0.001; ηp2 〈 0.50) for squats (0.01 ± 0.04 m·s−1) and hip thrusts (0.01 ± 0.05 m·s−1) and a low limit of agreement (LoA 〈 0.12 m·s−1) indicated an acceptable validity. The within- and between-day reliability of the MCV revealed good ICCs (0.55 〈 ICC 〈 0.91) and a low LoA ( 〈 0.16 m·s−1). Although the displacement revealed a systematic bias during squats (p 〈 0.001; ηp2 〈 0.10; 3.4 ± 3.4 cm), no bias was detectable during hip thrusts (p = 0.784; ηp2 〈 0.001; 0.3 ± 3.3 cm). The displacement showed moderate to good ICCs (0.43 to 0.95) but a high LoA (7.8 to 10.7 cm) for the validity and (within- and between-day) reliability of squats and hip thrusts. The VmaxPro® is considered to be a valid and reliable tool for the MCV assessment.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2175195-X
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  • 7
    Online Resource
    Online Resource
    MDPI AG ; 2021
    In:  International Journal of Environmental Research and Public Health Vol. 18, No. 15 ( 2021-07-28), p. 7968-
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 18, No. 15 ( 2021-07-28), p. 7968-
    Abstract: Background: To the authors’ knowledge, there have been no studies comparing the acute responses to “all out” efforts in concentric (isoinertial) vs. eccentric (isovelocity) cycling. Methods: After two familiarization sessions, 12 physically active men underwent the experimental protocols consisting of a 2-min warm-up and 8 maximal efforts of 5 s, separated by 55 s of active recovery at 80 rpm, in concentric vs. eccentric cycling. Comparisons between protocols were conducted during, immediately after, and 24-h post-sessions. Results: Mechanical (Work: 82,824 ± 6350 vs. 60,602 ± 8904 J) and cardiometabolic responses (mean HR: 68.8 ± 6.6 vs. 51.3 ± 5.7% HRmax, lactate: 4.9 ± 2.1 vs. 1.8 ± 0.6 mmol/L) were larger in concentric cycling (p 〈 0.001). The perceptual responses to both protocols were similarly low. Immediately after concentric cycling, vertical jump was potentiated (p = 0.028). Muscle soreness (VAS; p = 0.016) and thigh circumference (p = 0.045) were slightly increased only 24-h after eccentric cycling. Serum concentrations of CK, BAG3, and MMP-13 did not change significantly post-exercise. Conclusions: These results suggest the appropriateness of the eccentric cycling protocol used as a time-efficient (i.e., ~60 kJ in 10 min) and safe (i.e., without exercise-induced muscle damage) alternative to be used with different populations in future longitudinal interventions.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2175195-X
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  • 8
    Online Resource
    Online Resource
    Georg Thieme Verlag KG ; 2023
    In:  Sportphysio Vol. 11, No. 04 ( 2023-09), p. 179-185
    In: Sportphysio, Georg Thieme Verlag KG, Vol. 11, No. 04 ( 2023-09), p. 179-185
    Type of Medium: Online Resource
    ISSN: 2196-5951 , 2196-596X
    Language: German
    Publisher: Georg Thieme Verlag KG
    Publication Date: 2023
    SSG: 31
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  • 9
    Online Resource
    Online Resource
    Frontiers Media SA ; 2023
    In:  Frontiers in Physiology Vol. 14 ( 2023-4-20)
    In: Frontiers in Physiology, Frontiers Media SA, Vol. 14 ( 2023-4-20)
    Abstract: Introduction: Low-intensity endurance training is frequently performed at gradually higher training intensities than intended, resulting in a shift towards threshold training. By restricting oral breathing and only allowing for nasal breathing this shift might be reduced. Methods: Nineteen physically healthy adults (3 females, age: 26.5 ± 5.1 years; height: 1.77 ± 0.08 m; body mass: 77.3 ± 11.4 kg; VO 2 peak: 53.4 ± 6.6 mL·kg −1  min −1 ) performed 60 min of self-selected, similar (144.7 ± 56.3 vs. 147.0 ± 54.2 W, p = 0.60) low-intensity cycling with breathing restriction (nasal-only breathing) and without restrictions (oro-nasal breathing). During these sessions heart rate, respiratory gas exchange data and power output data were recorded continuously. Results: Total ventilation ( p & lt; 0.001, η p 2 = 0.45), carbon dioxide release ( p = 0.02, η p 2 = 0.28), oxygen uptake ( p = 0.03, η p 2 = 0.23), and breathing frequency ( p = 0.01, η p 2 = 0.35) were lower during nasal-only breathing. Furthermore, lower capillary blood lactate concentrations were found towards the end of the training session during nasal-only breathing (time x condition-interaction effect: p = 0.02, η p 2 = 0.17). Even though discomfort was rated marginally higher during nasal-only breathing ( p = 0.03, η p 2 = 0.24), ratings of perceived effort did not differ between the two conditions ( p ≥ 0.06, η p 2 = 0.01). No significant “condition” differences were found for intensity distribution (time spent in training zone quantified by power output and heart rate) ( p ≥ 0.24, η p 2 ≤ 0.07). Conclusion: Nasal-only breathing seems to be associated with possible physiological changes that may help to maintain physical health in endurance athletes during low intensity endurance training. However, it did not prevent participants from performing low-intensity training at higher intensities than intended. Longitudinal studies are warranted to evaluate longitudinal responses of changes in breathing patterns.
    Type of Medium: Online Resource
    ISSN: 1664-042X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2564217-0
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