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TRAINING EFFCT DURING THE MIDNIGHTSUN PERIOD IN DIFFERENT CHRONOTYPES

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TRAINING EFFECT DURING THE MIDNIGHT SUN PERIOD IN DIFFERENT CHRONOTYPES.

Weydahl A., Bjoerkesett E.

Introduction:

Our research takes place at 70oN. Where the sun is above the horizon for 8 weeks during summer, midnight sun and below the horizon for 8 weeks during winter, polar night.

Earlier we found that adults with different chronotypes responded differently to exercise performed in day-light or darkness1. During the polar night evening (E) and neither (N) -types respond to training better than morning (M) –types2. This study reports the effect of training during the midnight sun period in individuals with different chronotypes.

References:

1: Rossi, A .et al (2013). The chronotype can influence the perceived exertion during self-paced exercise performed at different times of day. Sport sciences for health, 9(Suppl. 1), 55-56.

2: Vitale, J. et al: Chronotype and response to training during the polar night: a pilot study. International Journal of Circumpolar Health. In press. 2017.

3:Horne JA, Ostberg O. A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms. Int J Chronobiol 1976;4:97–111.

Group trainings: Outside: walking hills, pyramid interval, short interval.

Inside circle training. Homework: brushing teeth one leg, short towel for back, lay down-turn over – stand up and strength exercises.

Vacation program.

Internett:

262 persons chonotype3

(MEQ: 16-41 E; 42-58 N; 59-86 M)

Excluded:

trained organized, health problems:

Showed up for test:

2 E MEQ: 29, 1 F + 1 M 5 N MEQ: 48-56, 5 F

6 M MEQ: 69-77, 4 F + 2 M

Tested: Start May

Training for 10 weeks, Log and Heart rate

monitoring.

2 E MEQ: 29 , 1 F +1 M 3 N MEQ: 48-51, 3 F

6 M MEQ: 69-77, 4F + 2 M

Tested: Start August

Method

Results:

All participants except one E-type, showed a decrease in VO2max from May to August. This participant increased the

VO2max to 51ml/min x kg from 38 ml/min x kg. We suspect that the result in May is too low, or that the result in August is wrong. If we exclude this person from the study, we have only 1 E-type, 3 N-types and 6 M-types. It seems as if it is difficult to get and keep the E-

types as participants in the study. The training logs showed that the participants had been active, but not in the organized training activity. The heart rate recordings were insufficient.

Conclusion:

Participating in organized training seems to be hard during the midnight sun period. Continuous follow-up and motivation is necessary to keep subjects in a study were training is

required. Especially E-types seem to need special follow-up. Even if the participants claimed they were active during the 10-week training period, we could not observe any positive training effect. It seems that the participants have more choices for activity like hikes, fishing and other out-of-doors activity. These activities might not have the intensity required to increase physical fitness, no

matter what chronotype the subject belongs to. During the midnight sun period, the biggest challenge is to get people to choose activities that give high enough intensity to get a training benefit.

The group size is a limiting factor.

Fig 1: Changes in VO2max from May August in % of the May value ((August-May)/May)*100 in different

chronotypes (MEQ), not shown the sunbject with

-20,0 -16,0 -12,0 -8,0 -4,0 0,0 4,0

20 30 40 50 60 70 80

%

MEQ score

20 25 30 35 40 45 50 55 60

1 2 3 4 5 6 7 8 9 10 11

VO2maxml/kg 'min

Subject: 1,2: E-types; 3-5: N-types; 7-12: M-types May August

Fig 2: VO2max in May and August in subject with different chronotypes

Invited:

14 E MEQ: 17-30, 7 F + 7 M 8 N MEQ: 48-57, 4 F + 4 M 10 M MEQ: 69-77, 4 F + 2 M

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