Table 2. A summary of the studies of daily repeated prolonged skiing exertions with men in field conditions.

Study

Distance (km)

Number of days

Number of male subjects

Measurements

Vuori et al., 1979

Shephard, 1991

Fellmann et al., 1992

260

1 730

323

6

91

6

17

13

11

Hormones

Polar stress

Hormones