23 resultados para relative torque
em Brock University, Canada
Resumo:
January 16, 1816.
Resumo:
15th Congress, 1st session, 1817-1818, House. Doc. 81.
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14th Congress, 1st session, 1815-1816. House. Document no. 33.
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13th Congress, 3d session. House. Doc. no. 13.
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United States,13th Congress, 2d session, 1813-1814. House. Doc. no. 35.
Resumo:
February 28, 1815. Printed by order of the Senate of the United States.
Resumo:
April 16, 1808. Printed by Order of the Senate.
Resumo:
Competitive sports participation in youth is becoming increasingly more common in the Western world. It is widely accepted that sports participation, specifically endurance training, is beneficial for physical, psychomotor, and social development of children. The research on the effect of endurance training in children has focused mainly on healthrelated benefits and physiological adaptations, particularly on maximal oxygen uptake. However, corresponding research on neuromuscular adaptations to endurance training and the latter's possible effects on muscle strength in youth is lacking. In children and adults, resistance training can enhance strength and mcrease muscle activation. However, data on the effect of endurance training on strength and neuromuscular adaptations are limited. While some evidence exists demonstrating increased muscle activation and possibly increased strength in endurance athletes compared with untrained adults, the neuromuscular adaptations to endurance training in children have not been examined. Thus, the purpose of this study was to examine maximal isometric torque and rate of torque development (RID), along with the pattern of muscle activation during elbow and knee flexion and extension in muscle-endurancetrained and untrained men and boys. Subjects included 65 males: untrained boys (n=18), endurance-trained boys (n=12), untrained men (n=20) and endurance-trained men (n=15). Maximal isometric torque and rate of torque development were measured using an isokinetic dynamometer (Biodex III), and neuromuscular activation was assessed using surface electromyography (SEMG). Muscle strength and activation were assessed in the dominant arm and leg, in a cross-balanced fashion during elbow and knee flexion and extension. The main variables included peak torque (T), RTD, rate of muscle activation (Q30), Electro-mechanical delay (EMD), time to peak RTD and co-activation index. Age differences in T, RTD, electro-mechanical delay (EMD) and rate of muscle activation (Q30) were consistently observed in the four contractions tested. Additionally, Q30, nonnalized for peak EMG amplitude, was consistently higher in the endurancetrained men compared with untrained men. Co-activation index was generally low in all contractions. For example, during maximal voluntary isometric knee extension, men were stronger, had higher RTD and Q30, whether absolute or nonnalized values were used. Moreover, boys exhibited longer EMD (64.8 ± 18.5 ms vs. 56.6 ± 15.3 ms, for boys and men respectively) and time to peak RTD (112.4 ± 33.4 ms vs. 100.8 ± 39.1 ms for boys and men, respectively). In addition, endurance-trained men had lower T compared with untrained men, yet they also exhibited significantly higher nonnalized Q30 (1.9 ± 1.2 vs. 1.1 ± 0.7 for endurance-trained men and untrained men, respectively). No training effect was apparent in the boys. In conclusion, the findings demonstrate muscle strength and activation to be lower in children compared with adults, regardless of training status. The higher Q30 of the endurance-trained men suggests neural adaptations, similar to those expected in response to resistance training. The lower peak torque may su9gest a higher relative involvement oftype I muscle fibres in the endurance-trained athletes. Future research is required to better understand the effect of growth and development on muscle strength and activation patterns during dynamic and sub-maximal isometric contractions. Furthennore, training intervention studies could reveal the effects of endurance training during different developmental stages, as well as in different muscle groups.
Resumo:
The purpose of this study was to examine the associations between bone speed of
sound (SOS) and body composition, osteoporosis-related health behaviours, and
socioeconomic status (SES) in adolescent females. A total of 442 adolescent females in
grades 9-11 participated. Anthropometric measures of height, body mass, and percent
body fat were taken, and osteo-protective behaviours such as oral contraceptive use
(OC), physical activity and daily calcium intake were evaluated using self-report
questionnaires. Bone SOS was measured by transaxial quantitative ultrasound (QUS)
at the distal radius and mid-tibia. The results suggest that fat mass is a significant
negative predictor of tibial SOS, while lean mass is positively associated with radial
SOS scores and calcium intake was positively associated with tibial SOS scores
(p
Resumo:
Small black and white photograph mounted on black card of an unidentified Bell family relative, possibly a sibling of Irene Bell, whose photo is similarly featured. This undated photograph was in the possession of the Rick Bell family, whose relatives include former Black slaves from the United States.According to the 1911 Census of Canada, Irene Bell had the following siblings: Ernest Bell, born 1889 Archie Bell, born 1895 Allen Bell, born 1901 Kenneth Bell, born 1910
Resumo:
This undated photograph features an unidentified Sloman family relative pictured outside of a house in an unknown location. The photograph was among the family memorabilia retrieved from the attic of Iris Sloman Bell, of St. Catharines, in the 1980s. The Sloman - Bell family has descendants who are former Black slaves from the United States who settled in southern Ontario.
Resumo:
January 16, 1816. Printed by order of the House of Representatives. 14th Congress, 1st Session, 1815-1816. House. At head of title: [27].