Elise Lander

• Vikmoen, Olav; Teien, Hilde Kristin; Tansø, Rita; Aandstad, Anders; Lander, Elise & Cumming, Kristoffer Toldnes [Vis alle 7 forfattere av denne artikkelen] (2023). Effects of a 10-d Military Field Exercise on Body Composition, Physical Performance, and Muscle Cells in Men and Women. Medicine & Science in Sports & Exercise. ISSN 0195-9131. 56(4), s. 682–696. doi: 10.1249/MSS.0000000000003340. Vis sammendrag

  Purpose: To investigate the effects of a demanding military field exercise on physical performance, body composition and muscle cellular outcomes in men and women. Methods: Ten men (20.5 ± 0.5 years) and 8 women (21.4 ± 1.4 years) completed a 10-day field exercise consisting of extensive physical activity with food and sleep restriction. Acquisition of body composition, physical performance, blood and muscle biopsies samples were done before and 1,7 and 14 days after the exercise. Results: There were no sex differences in the response to the exercise. Body mass was decreased with 5.6 ± 1.8% and fat mass with 31 ± 11% during the exercise. Both were still reduced after 14 days (2.5 ± 2.3%, p˂0.001 and 12.5 ± 7.7%, p˂0.001 respectively). Isometric leg strength did not change. Peak leg extension torque at 240 °·s-1 and counter movement jump height were reduced with 4.6 ± 4.8% (p = 0.012) and 6.7 ± 6.2% (p˂0.001) respectively and was still reduced after 14 days (4.3 ± 4.2%, p = 0.002, and 4.1 ± 4.7%, p = 0.030). No changes occurred in fiber CSA, fiber types, proteins involved in calcium handling or HSP70. During the exercise, αB-crystallin levels decreased by 14 ± 19% (p = 0.024) in the cytosolic fraction and staining intensity on muscle sections tended to increase (17 ± 25%, p = 0.076). MuRF1 levels in the cytosolic fraction tended to decrease (19 ± 35%) and increased with 85 ± 105% (p = 0.003) in the cytoskeletal fraction 1 week after the exercise. Conclusions: The field exercise resulted in reduced body mass and physical performance in both sexes. The ability to produce force at high contraction velocities and explosive strength was more affected than isometric strength, but this was not related to any changes in fiber type composition, fiber area, Ca2+ handling or fiber type specific muscle damage.

• Lander, Elise; Kirkhus, Bente; Lindberg, Diana & Raastad, Truls (2023). Aminoacidemia after ingestion of protein hydrolysate produced from poultry carcasses: A comparison against whey protein in a randomized, double-blinded cross-over study in healthy young and old individuals. Journal of Functional Foods. ISSN 1756-4646. 102, s. 1–10. doi: 10.1016/j.jff.2023.105452. Fulltekst i vitenarkiv Vis sammendrag

  This study investigated the aminoacidemia after ingestion of a poultry protein hydrolysate (PPH) and whey protein in healthy young and old participants. Protein-drinks were also digested using the INFOGEST static in vitro digestion model to simulate gastrointestinal changes in young and old adults. In fasted state, 10 young (20-40y) and 10 old (70-80y) ingested PPH or whey as a 20 g protein-drink and blood samples were collected. Plasma leucine concentration increased more when ingesting whey than PPH (young 62 ± 27 vs. 48 ± 27%, old 94 ± 57 vs. 66 ± 26%) but the peak concentration was reached faster after drinking PPH (p < 0.05). The in vitro digestion of PPH was consistent with the observed changes in plasma amino acid concentrations, but whey digestibility was lower under ageing conditions. These results show that PPH is rapidly digested and absorbed due to the hydrolysis into short peptide chains, and that healthy elderly have similar absorption as younger individuals.

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