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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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In 2012, five Qatari women participated in a qualitative research study, which aimed to explore the negotiation of opportunity to be members of Qatar's first national women's football team. Qatar is a conservative Islamic country which is experiencing rapid modernisation. Part of this modernisation includes the increasing visibility of sport, for example the successful bid for the 2022 men's Football World Cup. In response to this bid, the first Qatari women's national football team was established in 2011. The project was positioned within a social constructivist framework. Five out of 12 squad members, over the age of 18, volunteered to participate in semi-structured interviews. Interview questions probed the women's experiences and influences on their opportunities and journey to membership in the national team. From a thematic analysis, issues such as the management of gender norms and the influence of significant others dominated the data. This research indicated that the women's agency enabled them to manage their situation with a range of strategies and to change attitudes towards women footballers. The winning of the bid to host the men's World Cup has been a catalyst for change in making spaces for Qatari sportswomen. 相似文献
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