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Relationship between laboratory-measured variables and heart rate during an ultra-endurance triathlon 总被引：1，自引：1，他引：0
Laursen PB Knez WL Shing CM Langill RH Rhodes EC Jenkins DG 《Journal of sports sciences》2005,23(10):1111-1120
The aim of the present study was to examine the relationship between the performance heart rate during an ultra-endurance triathlon and the heart rate corresponding to several demarcation points measured during laboratory-based progressive cycle ergometry and treadmill running. Less than one month before an ultra-endurance triathlon, 21 well-trained ultra-endurance triathletes (mean +/- s: age 35 +/- 6 years, height 1.77 +/- 0.05 m, mass 74.0 +/- 6.9 kg, = 4.75 +/- 0.42 l x min(-1)) performed progressive exercise tests of cycle ergometry and treadmill running for the determination of peak oxygen uptake (VO2peak), heart rate corresponding to the first and second ventilatory thresholds, as well as the heart rate deflection point. Portable telemetry units recorded heart rate at 60 s increments throughout the ultra-endurance triathlon. Heart rate during the cycle and run phases of the ultra-endurance triathlon (148 +/- 9 and 143 +/- 13 beats x min(-1) respectively) were significantly (P < 0.05) less than the second ventilatory thresholds (160 +/- 13 and 165 +/- 14 beats x min(-1) respectively) and heart rate deflection points (170 +/- 13 and 179 +/- 9 beats x min(-1) respectively). However, mean heart rate during the cycle and run phases of the ultra-endurance triathlon were significantly related to (r = 0.76 and 0.66; P < 0.01), and not significantly different from, the first ventilatory thresholds (146 +/- 12 and 148 +/- 15 beats x min(-1) respectively). Furthermore, the difference between heart rate during the cycle phase of the ultra-endurance triathlon and heart rate at the first ventilatory threshold was related to marathon run time (r = 0.61; P < 0.01) and overall ultra-endurance triathlon time (r = 0.45; P < 0.05). The results suggest that triathletes perform the cycle and run phases of the ultra-endurance triathlon at an exercise intensity near their first ventilatory threshold. 相似文献
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Hyun-Joo Jeon Carolyn C. Langill Carla A. Peterson Gayle J. Luze Judith J. Carta Jane B. Atwater 《Early education and development》2013,24(6):912-939
This study examined relations among children's individual experiences, global classroom quality, and school readiness. Preschool children from low-income backgrounds (N = 138; M = 62.16 months; SD = 3.93; range = 55?70) were observed in their early care and education settings, and their language and cognitive skills were assessed. Research Findings: Individual children in classrooms with small group sizes had higher quality individual experiences even though global classroom quality was not necessarily better. Higher levels of global classroom quality did not ensure that every child in the classroom was engaged fully in available interactions and activities. Children with disabilities were generally enrolled in classrooms with higher global quality and had higher quality individual experiences than those without disabilities; however, children without disabilities enrolled in these inclusive classrooms did not necessarily have a higher level of individual experiences than those in non-inclusive classrooms. Children's individual experiences and the global quality of their classrooms were associated with their social skills. Only the quality of children's individual experiences was found to be related to the quality of their relationships with teachers. Practice or Policy: Ratings of children's individual experiences provide information beyond that provided by global ratings of classroom quality and have potential for informing efforts to individualize educational programs. 相似文献
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