Search Results

You are looking at 51 - 60 of 917 items for :

  • "accelerations" x
Clear All
Restricted access

William Abbott, Adam Brett, Emma Cockburn and Tom Clifford

Purpose: To examine whether consuming casein protein (CP) before sleep would enhance recovery after a nighttime soccer match in professional players. Methods: In a randomized, crossover design, 10 professional soccer players from the reserve squad of a team in the highest tier of English soccer consumed 40 g of CP or 40 g of carbohydrates (CON) 30 min presleep after a soccer match (kick off: 7 PM). To assess recovery, countermovement-jump height, reactive strength index, muscle soreness, and the adapted Brief Assessment of Mood (BAM+) Questionnaire were measured before and 12, 36, and 60 h after each match. Dietary intake across the testing period was also recorded. Results: There were unclear differences in external load in the matches and dietary intake between CON and CP. Casein protein had a most likely and likely beneficial effect on countermovement-jump recovery at 12 and 36 h postmatch (CP −1.6; ±1.2% vs CON −6.6; ±1.7%; −4.1; ±2.3% vs −0.4; ±1.1%, respectively). Reactive strength index recovery was most likely enhanced with CP at 12 and 36 h postmatch, and muscle soreness, as measured with a visual analog scale (in millimeters), was most likely greater in CON versus CP at 12 h postmatch (72; ±17 vs 42; ±20 mm). BAM+ was possibly lower in CON at 36 h postmatch but unaffected at other time points. Conclusions: Presleep CP accelerates functional recovery in professional soccer players and, therefore, provides a practical means of attenuating performance deficits in the days after a match.

Restricted access

Daniel P. Muise, Sasho J. MacKenzie and Tara M. Sutherland

The increased awareness of concussion in sport has led to an examination of head impacts and the associated biomechanics that occur during these sporting events. The high rate of concussions in football makes it particularly relevant.1 The purpose of this study was to examine how frequently, and to what magnitude, Canadian University football players get hit in training camp and how this compares to practices and games in regular season. An ANOVA with repeated measures indicated that, on average, players were hit significantly more in games (45.2 hits) than training camp sessions (17.7 hits) and practices (8.0 hits), while training camp was associated with significantly more hits than practices (p < .001, η2 = .392). Multiple positional differences were found. In particular, significantly more hits were experienced by offensive linemen (36.7 hits) and defensive linemen (31.6 hits) compared with all other positions (p < .001, η2 = .247). Study outcomes determined players/positions most at risk for concussion due to head impacts, which is beneficial in forming concussion prevention and assessment strategies.

Restricted access

Hatice Mujde Ayık and Michael J. Griffin

.m.s.) average acceleration as one of the measures of the magnitude of a vibration. However, the discomfort of seated people exposed to whole-body vibration depends on the motion waveform, with greater sensitivity to random vibration than to sinusoidal vibration of the same frequency and the same r

Restricted access

Anamaria Laudet Silva Mangubat, Janet Hanwen Zhang, Zoe Yau-Shan Chan, Aislinn Joan MacPhail, Ivan Pui-Hung Au and Roy Tsz-Hei Cheung

postural stability. However, each step cycle subjects our eyes, and consequently our heads, to a changing vertical acceleration, which may lead to blurring of the visual field if head accelerations are not stabilized. 2 Each foot strike during gait sends a shock wave from our lower bodies and is

Restricted access

Yoshifumi Kijima, Ryoji Kiyama, Masaki Sekine, Toshiyo Tamura, Toshiro Fujimoto, Tetsuo Maeda and Tadasu Ohshige

methods ( Kobsar, Olson, Paranjape, Hadjistavropoulos, & Barden, 2014 ). A previous study analyzed the effect of age on acceleration of the trunk during walking and found that older adults had a lower gait regularity than did young adults ( Menz, 2003 ). Matsumoto et al. ( 2015 ) reported that regularity

Restricted access

Garrett M. Hester, Zachary K. Pope, Mitchel A. Magrini, Ryan J. Colquhoun, Alejandra Barrera-Curiel, Carlos A. Estrada, Alex A. Olmos and Jason M. DeFreitas

peak velocity (PV) and acceleration (sometimes termed rate of velocity development) of the knee extensors are negatively affected by age ( Thompson, Conchola, Palmer, & Stock, 2014 ; Wallace, Power, Rice, & Dalton, 2016 ). Similar to the effect of age on other rapid, time-sensitive measures (e

Restricted access

Karin Fischer-Sonderegger, Wolfgang Taube, Martin Rumo and Markus Tschopp

distance a player covered in different speed zones. 4 However, several studies have pointed out that speed-based indicators do not reveal the complete picture of physical load in soccer. 5 – 11 Due to the fact that efforts with high accelerations requires a greater amount of energy and a higher muscular

Restricted access

Ryu Nagahara, Yohei Takai, Miki Haramura, Mirai Mizutani, Akifumi Matsuo, Hiroaki Kanehisa and Tetsuo Fukunaga

in SL is caused by increases in height and/or relative vertical impulse. GRFs during the acceleration phase of sprinting largely change as propulsive forces decrease, and braking and vertical forces increase ( 14 ). Moreover, the difference in maximal speed results from the preceding difference in

Restricted access

Ted Polglaze and Matthias W. Hoppe

demands of brief, nonsteady-state—and often high-intensity—accelerations cannot be directly measured. However, this is possible for steady-state incline running, where energy cost increases with slope but, as per running on level ground, is independent of speed at a given slope. 5 Accordingly