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List of forums / Slovenia / Ski touring / Heart rate in ski touring

Heart rate in ski touring

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1mitjas21. 12. 2011 14:59:03
A bit longer, but that's basically the title of my diploma thesis at the Faculty of Sports. More than six years have passed since then and maybe someone will be interested.

After the first tours in October, the season is obviously starting. We got surprising results for most people; here I'll post the conclusion, and for those interested in more, the full work is attached.

Heart rate is a generally established parameter for monitoring the level of exertion during activity. Different individuals overcome the same exertion with different effort. The purpose of our thesis was to monitor heart rate in beginners of ski touring and to determine how heart rate differs between individual parts of the tour, between genders and with different guides.

31 students from the Faculty of Sports participated in the thesis, 20 men and 11 women. They were on average 22 years old, variously physically fit, and healthy on the day of measurement.

The purpose of the diploma thesis is to inform as wide a circle of people as possible about heart rate in ski touring, the importance of its measurement, differences in invested energy between students and female students and of course about the physical fitness required for ski touring. We also focused on differences between ascent and descent, as many think that with the conquered summit they have finished the tour and that they don't need any strength for skiing. All this will help in planning and executing ski tours, for both ski touring beginners, masters of ski touring and professionals. We also hope that the thesis will deter people from overestimating their abilities, which is still one of the main causes of accidents in the mountain world.

We observed no differences between ascent and descent, although they are completely separate parts of the tour, both in duration and mode of movement. Similarly, there were no statistically significant differences between men and women; the opposite of expected happened, women had a lower average heart rate. We also found that different guides have no influence on heart rate, as they all try to adjust their pace as much as possible to the group they lead.

Ski touring is one of the most beautiful activities in the snow-covered mountain world. It is as demanding as the ski tourer makes it himself. The intensity of effort is regulated by the pace of walking and descending. If one wants to enjoy the beauties of the mountains and movement in fresh air, the pace of progress will be slower. If one wants greater physical exertion, the pace will be accordingly faster. With a suitably chosen terrain or tour, ski touring is suitable for both beginners and experienced ski tourers, those who are well-conditioned or only averagely fit.

The full work can be found at www.mitja.alpinizem.net
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lynx21. 12. 2011 17:04:09
Interesting, but my experiences are not like that. Generally my heart rate quickly jumps towards maximum, unless the snow is really consistently even and I trust it. Usually regular breaks are necessary. zadrega
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enjanez21. 12. 2011 18:50:38
Also with me the heart rate is higher on descent. True, I have 33 years more than the average. mežikanje
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1mitjas21. 12. 2011 19:58:57
It happened here too. We measured the frequency the whole tour time, excluded rest at the top and calculated average heart rate for ascent and average for descent. During descent of course it jumped a lot and calmed during breaks. The whole descent time (incl. breaks) was quite similar to the whole ascent time (incl. breaks).
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1mitjas21. 12. 2011 20:04:23
Another sentence from the part explaining the method:

The trip to 2003m high Lanževica was part of the regular program in the Mountaineering subject at the Faculty of Sports. The starting point was at the hut under Bogatin at 1513m above sea level. This means students did 490m relative height up and the same down. The tour total lasted 4 hours and 4 minutes. Of that, 2 hours and 24 minutes ascent and 1 hour and 40 minutes descent. The longer rest at the top was not included in the tour time. The tour was fully done on skis.

For ascent and descent, one would expect differences, as they are completely separate parts of the tour, both in terms of movement and effort duration (ascent 2 hours and 24 minutes, descent 1 hour and 40 minutes), yet there were no differences. Average heart rate values for men were at ascent 142.9 ± 12.6 and at descent 143.8 ± 12.5. These values are very close to the values from the Sevšek (2000) study, where similarly no differences were measured between ascent (145 ± 13) and descent (146 ± 11) in ski touring. The heart rates of our subjects were 2 beats per minute lower, both at ascent and descent, than in the Sevšek (2000) study. If looking at age, one would expect the opposite, since the two ski tourers in the mentioned study were almost 30 years older than our subjects. It is known that heart rate decreases with age (De Vris, 1976). The lower heart rate in our case can also be explained by the group pace. It should be known that in the Sevšek (2000) study, two trained ski tourers participated. They had a fairly fast and even pace for the entire tour, adapted to their physical abilities and technical knowledge. Both were at a high level. Our group consisted of 12 sports faculty students, who are usually well conditioned, but had big problems with the technique of progressing on touring skis. On the mentioned tour, almost all stood on touring skis for the first time. Thus, the pace was adapted to the student who had the most trouble progressing. The result of such a low heart rate is probably a combination of the students' good conditioning and the slow progression pace, which is a consequence of poor technical knowledge of walking on touring skis. That there is practically no difference in heart rate between ascent and descent can be explained by the tour leading tactic, which includes progression pace with breaks and terrain choice. Every leader during ascent leads the group so that the progression pace is as even as possible and fast enough that all participants can follow without trouble. Thus, the heart rate of participants almost does not change. After initial warm-up, it reaches a certain level, which decreases only during short stops. During descent, the pace is somewhat different. During the entire ski descent, skiing needs to be constantly monitored. Changing snow affects the speed of descending the slope. The touring skier must have enough reserve at every moment during skiing to stop immediately. Because of this and the terrain configuration, which is very varied in mountains, there are larger fluctuations in heart rate during descent. In demanding terrain, the frequency rises strongly, even close to maximum frequency, in flat, undemanding parts, it can calm almost to resting state. Precisely because of these fluctuations, the average heart rate is probably similar between ascent and descent.
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lynx21. 12. 2011 20:08:04
This rather hints that the test persons rested often enough and long enough. More interesting would be a comparison of average frequencies only during exertion.
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sla22. 12. 2011 08:30:05
Interesting. Mitja, do you think the results would differ with a different tour and other participants? Lanževica is among easy ski tours with relatively low ascent height and gentle skiing, plus "difovci" usually have fitness. If VDV, there from Rudno polje almost double height difference and also longer tour with steep summit ascent, skiing also quite demanding at the beginning. Average touring skier usually gains fitness with possible summer ascents and increases it during winter.
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1mitjas22. 12. 2011 10:33:21
Lynx - for comparison only during exertion, each student would need to press the button on the watch every time they stopped for a rest. Then we would lose a lot of data, as people make mistakes and it is not said that they would start the watch again. It is not possible to exclude rests accurately enough based only on the heart rate graphs, at least not with my statistics knowledge. Besides, we wanted data from the whole descent, true it is more interval movement, but the data was interesting for us.

Sla: in my opinion, heart rate between ascent and descent would be similar for most skiers, regardless of the tour. Probably it would be higher than what we got, as ours was really low, pace slow. I myself had on tours that I monitored an average frequency of 100 beats per minute, approximately like walking around the city. If the group was smaller and more homogeneous, the frequency would be higher, of course depending on the pace and effort that the skier puts into the tour.
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