Recovery of Hormonal, Blood Lipid, and Hematological Profiles from a North Pole Expedition

Gagnon, Dominique D.; Pullinen, Teemu; Karinen, Heikki; Rintamäki, Hannu; Kyröläinen, Heikki

doi:10.3357/asem.3016.2011

Cited by 11 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These responses may also be due to central hypogonadism (Stroud et al 1997). Again, loss of body mass seems a common factor, with a 25% reduction observed (albeit in only two volunteers) in the data reported by Stroud (Stroud et al 1997), and a 10 kg loss reported by Gagnon (Gagnon et al 2011). …”

Section: Introductionmentioning

confidence: 53%

“…Consumption of the CCR facilitated maintenance of body mass and micronutrient status. Most studies investigating the physical responses to Polar expeditions have reported a decrease in body mass, with a concomitant reduction in circulating testosterone concentrations (Stroud et al 1997, Gagnon et al 2011, Johansen et al 1991) in a pattern consistent with central hypogonadism (Stroud et al 1997). …”

Section: Discussionmentioning

confidence: 99%

“…Similar to endocrine responses to arduous physical training, the physical demands associated with Polar expeditions in the Arctic and Antarctica have also been associated with decreases in testosterone concentrations (Stroud et al 1997, Gagnon et al 2011, Johansen et al 1991. These responses may also be due to central hypogonadism (Stroud et al 1997).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nutritional status and the gonadotrophic response to a polar expedition

Woods

Delves²,

Britland³

et al. 2015

Appl. Physiol. Nutr. Metab.

View full text Add to dashboard Cite

Polar expeditions have been associated with changes in the hypothalamic-pituitarytesticular axis consistent with central hypogonadism (i.e. decreased testosterone, luteinising hormone [LH] and follicle stimulating hormone [FSH]). These changes are typically associated with body mass loss. Our aim was to evaluate whether maintenance of body mass during a Polar expedition could mitigate against the development of central hypogonadism. Maintenance of body mass and nutritional status appeared to negate the central hypogonadism previously reported from Polar expeditions. The elevated TSH and free T3were consistent with a previously reported "Polar T3 syndrome".

show abstract

Section: Introductionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nutritional status and the gonadotrophic response to a polar expedition

Woods

Delves²,

Britland³

et al. 2015

Appl. Physiol. Nutr. Metab.

View full text Add to dashboard Cite

show abstract

“…In addition to the influence of exercise on the sequestration of amino acids by the working muscle (Devlin et al., 1990), nutrient intake and/or progressive, exertion-linked changes in fuel selection may play a significant role in the sparing of amino acids that facilitate the maintenance of FFM (Burke, 2015). Macronutrient intake data were not available in this particular study, but similar expeditions have reported variable dietary intake of approximately ~35–66% carbohydrate, 29–55% fat, and 17–20% protein in ultra-athletes (Wolfe et al., 1984; Stroud et al, 1993, 1996; Gannon et al., 2001; Praz et al., 2015). We know from our own anecdotal observations during the 2015 and 2017 YAU that many of these athletes may consume more fat than described in earlier studies.…”

Section: Discussionmentioning

confidence: 91%

Negative Energy Balance Does Not Alter Fat-Free Mass During the Yukon Arctic Ultra—The Longest and the Coldest Ultramarathon

et al. 2018

View full text Add to dashboard Cite

Purpose: The objective of this study was to determine alterations in caloric balance, body composition, metabolites, and cytokines in athletes participating in the Yukon Arctic Ultra.Methods: Ten participants traveling on foot in the 2017 692-km event were recruited for the study. Measurements and samples were obtained at pre-event, 278 km (C1), 384 km (C2), and post-event. Body composition measurements were obtained using bioelectrical impedance analysis. Accelerometer devices were utilized to provide an estimation of caloric expenditure and dietary recalls provided assessments of caloric intake. Blood serum samples were collected, processed, and analyzed using enzyme-linked immunosorbent assays or nuclear magnetic resonance. Results were analyzed using linear mixed model, presented as means ± SD, and considered significant at p < 0.05.Results: Participants (8 males, 2 females; age: 37 ± 10 years; body mass index: 24.4 ± 2.5 kg/m2) were recruited. Four males and one female completed the entire event in 260 ± 19 h. Caloric intake/expenditure was 4,126 ± 1,115 kcal/day and 6,387 ± 781 kcal/day, respectively, indicating a caloric deficit of 2,261 ± 1,543 kcal/day. Total mass, body mass index, and fat mass were reduced at each time point of the event. Fat-free mass (FFM) was unchanged throughout the event. Follistatin was increased at C1 (1,715 ± 876 pg/ml) in comparison to baseline. Acetoacetate increased significantly at post-event (6.1 ± 1.5 mg/ml).Conclusions: Despite a pronounced caloric deficit and sustained activity under extreme cold conditions, FFM was preserved with an increase in serum follistatin and acetoacetate. Future studies should be directed at the role of nutrient strategies and/or training methods on the retention of FFM under these conditions.

show abstract

“…Participants in supported polar expeditions have traditionally experienced modest levels of negative energy availability 19 – 22 whilst those undertaking unsupported polar expeditions have experienced high levels of negative energy availability as evidenced by up to 25% loss of body weight 10 , 12 . Our previous work has suggested only modest levels of negative energy availability in participants in both the Spear-17 17 and Ice Maiden 18 expeditions.…”

Section: Introductionmentioning

confidence: 99%

A comparison of the metabolic effects of sustained strenuous activity in polar environments on men and women

Hattersley

Wilson

Gifford

et al. 2020

Sci Rep

View full text Add to dashboard Cite

This study investigates differences in pre-to post-expedition energy expenditure, substrate utilisation and body composition, between the all-male Spear17 (SP-17) and all-female Ice Maiden (IM) transantarctic expeditions (IM: N = 6, 61 days, 1700 km; SP-17: N = 5, 67 days, 1750 km). Energy expenditure and substrate utilisation were measured by a standardised 36 h calorimetry protocol; body composition was determined using air displacement plethysmography. Energy balance calculation were used to assess the physical challenge. There was difference in the daily energy expenditure (IM: 4,939 kcal day −1 ; SP-17: 6,461 kcal day −1 , p = 0.004); differences related to physical activity were small, but statistically significant (IM = 2,282 kcal day −1 ; SP-17 = 3,174 kcal day −1 ; p = 0.004). Bodyweight loss was modest (IM = 7.8%, SP-17 = 6.5%; p > 0.05) as was fat loss (IM = 30.4%, SP-17 = 40.4%; p > 0.05). Lean tissue weight change was statistically significant (IM = − 2.5%, SP-17 = + 1.0%; p = 0.05). No difference was found in resting or sleeping energy expenditure, normalised to lean tissue weight (p > 0.05); nor in energy expenditure when exercising at 80, 100 and 120 steps min −1 , normalised to body weight (p > 0.05). Similarly, no difference was found in the change in normalised substrate utilisation for any of the activities (p > 0.05). Analysis suggested that higher daily energy expenditures for the men in Spear-17 was the result of higher physical demands resulting in a reduced demand for energy to thermoregulate compared to the women in Ice Maiden. The lack of differences between men and women in the change in energy expenditure and substrate utilisation, suggests no sex difference in response to exposure to extreme environments. There is an increasing involvement of women in extreme activities often in adverse environmental conditions that are characterised by a deficit in Energy Availability (EA), the difference between the calorific intake and the energy expended. These activities, which include extreme sports 1 , expeditionary travel and military combat training 2 , have traditionally been undertaken by men with the result that the majority of the research looking at physiological adaptation and responses, particularly during expeditionary travel in polar regions and to altitude,

show abstract

Recovery of Hormonal, Blood Lipid, and Hematological Profiles from a North Pole Expedition

Cited by 11 publications

References 0 publications

Nutritional status and the gonadotrophic response to a polar expedition

Nutritional status and the gonadotrophic response to a polar expedition

Negative Energy Balance Does Not Alter Fat-Free Mass During the Yukon Arctic Ultra—The Longest and the Coldest Ultramarathon

A comparison of the metabolic effects of sustained strenuous activity in polar environments on men and women

Contact Info

Product

Resources

About