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  • 1
    Online Resource
    Online Resource
    Transfer Effects of Fall Training on Balance Performance and Spatiotemporal Gait Parameters in Healthy Community-Dwelling Older Adults: A Pilot Study
    Human Kinetics ; 2014
    In:  Journal of Aging and Physical Activity Vol. 22, No. 3 ( 2014-07), p. 324-333
    Details
    In: Journal of Aging and Physical Activity, Human Kinetics, Vol. 22, No. 3 ( 2014-07), p. 324-333
    Abstract: This study examined transfer effects of fall training on fear of falling (Falls Efficacy Scale—International [FES–I]), balance performance, and spatiotemporal gait characteristics in older adults. Eighteen community-dwelling older adults (ages 65–85) were randomly assigned to an intervention or control group. The intervention group completed 12 training sessions (60 min, 6 weeks). During pre- and posttesting, we measured FES–I, balance performance (double limb, closed eyes; single limb, open eyes; double limb, open eyes with motor-interfered task), and gait parameters (e.g., velocity; cadence; stride time, stride width, and stride length; variability of stride time and stride length) under single- and motor-interfered tasks. Dual tasks were applied to appraise improvements of cognitive processing during balance and gait. FES–I ( p = .33) and postural sway did not significantly change (0.36 〈 p 〈 .79). Trends toward significant interaction effects were found for step width during normal walking and stride length variability during the motor dual task ( p = .05, η p 2 = .22). Fall training did not sufficiently improve fear of falling, balance, or gait performance under single- or dual-task conditions in healthy older adults.
    Type of Medium: Online Resource
    ISSN: 1063-8652 , 1543-267X
    URL: Article
    DOI: 10.1123/JAPA.2013-0010
    Language: Unknown
    Publisher: Human Kinetics
    Publication Date: 2014
    SSG: 31
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  • 2
    Online Resource
    Online Resource
    M. Biceps Femoris Long Head Architecture and Sprint Ability in Youth Soccer Players
    Human Kinetics ; 2021
    In:  International Journal of Sports Physiology and Performance Vol. 16, No. 11 ( 2021-11-1), p. 1616-1624
    Details
    In: International Journal of Sports Physiology and Performance, Human Kinetics, Vol. 16, No. 11 ( 2021-11-1), p. 1616-1624
    Abstract: Purpose : Hamstring muscle architecture may be associated with sprint performance and the risk of sustaining a muscle injury, both of which increase during puberty. In this study, we investigated the m. biceps femoris long head (BFlh) cross-sectional area (ACSA), fascicle length (FL) and pennation angle (PA), and sprint performance as well as their relationship in under 13 to 15 youth soccer players. Methods : We measured 85 players in under-13 (n = 29, age = 12.5 [0.1] y, height = 155.3 [6.2]  cm, weight = 43.9 [7.6] kg), under-14 (n = 25, age = 13.5 [0.3]  y, height = 160.6 [7.7] cm, weight = 47.0 [6.8]  kg), and under-15 (n = 31, age = 14.4 [0.3] y, height = 170.0 [7.7]  cm, weight = 58.1 [8.8] kg) teams. We used ultrasound to measure BFlh ACSA, FL and PA, and sprint tests to assess 10- and 30-m sprint time, maximal velocity  ( v max ), and maximal acceleration ( α max ). We calculated Pearson r to assess the relationship between sprint ability and architectural parameters. Results : All muscle architectural parameters increased from the under-13 to the under-15 age group (BFlh ACSA = 37%, BFlh FL = 11%, BFlh PA = 8%). All sprint performance parameters improved from the under-13 to under-15 age categories (30-m time = 7%, 10-m time = 4%, v max  = 9%, α max  = 7%). The BFlh ACSA was correlated with 30-m sprint time ( r  = −.61 (95% compatibility interval [CI] [−.73, −.45] ) and v max ( r  = .61, 95% CI [.45, .72]). A combination of BFlh ACSA and age best predicted 30-m time ( R ² = .47 [.33, .62]) and 10-m time ( R ² = .23 [.08, .38]). Conclusions : Muscle architectural as well as sprint performance parameters increase from the under-13 to under-15 age groups. Even though we found correlations for all assessed architectural parameters, BFlh ACSA was best related to the assessed sprint parameters.
    Type of Medium: Online Resource
    ISSN: 1555-0265 , 1555-0273
    URL: Article
    DOI: 10.1123/ijspp.2020-0726
    Language: Unknown
    Publisher: Human Kinetics
    Publication Date: 2021
    SSG: 31
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  • 3
    Online Resource
    Online Resource
    Neuromuscular Activation During Short-Track Speed Skating in Young Athletes
    Human Kinetics ; 2016
    In:  International Journal of Sports Physiology and Performance Vol. 11, No. 7 ( 2016-10), p. 848-854
    Details
    In: International Journal of Sports Physiology and Performance, Human Kinetics, Vol. 11, No. 7 ( 2016-10), p. 848-854
    Abstract: To investigate differences in muscle activation of both legs between the straight and the curve and changes in muscle activity during a 1000-m time trial (TT) and their relationship to the change in skating velocity in 9 young short-track speed skaters. The authors recorded skating times and EMG data from different leg muscles during maximum-effort skating trials on the straight and in the curve, as well as during a 1000-m TT. Results: Muscle activation differs between the straight and the curves and between legs; ie, average activities of selected muscles of the right leg were significantly higher during skating through the curves than in the straights. This could not be observed for the left leg. The reduction in speed during the 1000-m TT highly correlates with the decrease in the muscle activity of both the tibialis anterior and the rectus femoris of the right leg. Muscle recruitment is different in relation to lap section (straight vs curve) and leg (right vs left leg). The decreased muscle activity of the tibialis anterior and rectus femoris of the right leg showed the highest relationships with the reduction in skating speed during the 1000-m TT.
    Type of Medium: Online Resource
    ISSN: 1555-0265 , 1555-0273
    URL: Article
    DOI: 10.1123/ijspp.2015-0344
    Language: Unknown
    Publisher: Human Kinetics
    Publication Date: 2016
    SSG: 31
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  • 4
    Online Resource
    Online Resource
    No Effect of Acute Balenine Supplementation on Maximal and Submaximal Exercise Performance in Recreational Cyclists
    Human Kinetics ; 2023
    In:  International Journal of Sport Nutrition and Exercise Metabolism Vol. 33, No. 2 ( 2023-03-1), p. 84-92
    Details
    In: International Journal of Sport Nutrition and Exercise Metabolism, Human Kinetics, Vol. 33, No. 2 ( 2023-03-1), p. 84-92
    Abstract: Carnosine (β-alanyl- L -histidine) and its methylated analogues anserine and balenine are highly concentrated endogenous dipeptides in mammalian skeletal muscle that are implicated in exercise performance. Balenine has a much better bioavailability and stability in human circulation upon acute ingestion, compared to carnosine and anserine. Therefore, ergogenic effects observed with acute carnosine and anserine supplementation may be even more pronounced with balenine. This study investigated whether acute balenine supplementation improves physical performance in four maximal and submaximal exercise modalities. A total of 20 healthy, active volunteers (14 males; six females) performed cycling sprints, maximal isometric contractions, a 4-km TT and 20-km TT following either preexercise placebo or 10 mg/kg of balenine ingestion. Physical, as well as mental performance, along with acid–base balance and glucose concentration were assessed. Balenine was unable to augment peak power ( p  = .3553), peak torque ( p  = .3169), time to complete the 4 km ( p  = .8566), nor 20 km time trial ( p  = .2660). None of the performances were correlated with plasma balenine or CN1 enzyme activity. In addition, no effect on pH, bicarbonate, and lactate was observed. Also, the supplement did not affect mental performance. In contrast, glucose remained higher during and after the 20 km time trial following balenine ingestion. In conclusion, these results overall indicate that the functionality of balenine does not fully resemble that of carnosine and anserine, since it was unable to elicit performance improvements with similar and even higher plasma concentrations.
    Type of Medium: Online Resource
    ISSN: 1526-484X , 1543-2742
    URL: Article
    DOI: 10.1123/ijsnem.2022-0115
    Language: Unknown
    Publisher: Human Kinetics
    Publication Date: 2023
    SSG: 31
    Location Call Number Limitation Availability
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    Online Resource
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