Search results for "kestävyyslajit"
showing 8 items of 8 documents
The Effect of a Ketogenic Low-Carbohydrate, High-Fat Diet on Aerobic Capacity and Exercise Performance in Endurance Athletes: A Systematic Review and…
2021
A low-carbohydrate, high-fat (LCHF) diet has been proposed to enhance the fat utilization of muscle and the aerobic capacity of endurance athletes, thereby improving their exercise performance. However, it remains uncertain how the macronutrient intake shift from carbohydrate to fat affects endurance exercise training and performance. This study performed a systematic review and meta-analysis to explore the effects of a ketogenic low-carbohydrate, high-fat (K-LCHF) diet on aerobic capacity and exercise performance among endurance athletes. Searches were carried out in five electronic databases, and we followed the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) gu…
Nutrition Knowledge Is Associated with Energy Availability and Carbohydrate Intake in Young Female Cross-Country Skiers
2021
The aim of this study was to provide information on energy availability (EA), macronutrient intake, nutritional periodization practices, and nutrition knowledge in young female cross-country skiers. A total of 19 skiers filled in weighted food and training logs before and during a training camp. Nutrition knowledge was assessed via a validated questionnaire. EA was optimal in 11% of athletes at home (mean 33.7 ± 9.6 kcal·kgFFM−1·d−1) and in 42% at camp (mean 40.3 ± 17.3 kcal·kgFFM−1·d−1). Most athletes (74%) failed to meet recommendations for carbohydrate intake at home (mean 5.0 ± 1.2 g·kg−1·d−1) and 63% failed to do so at camp (mean 7.1 ± 1.6 g·kg−1·d−1). The lower threshold of the pre-ex…
Neuromuscular, hormonal and oxidative stress responses to endurance running exercises in well-trained runners
2007
The aim of this study was to investigate to which type of running exercises well trained endurance runners respond more favourably with regard to acute neuromuscular and endocrinological responses and exercise-induced oxidative stress. It was hypothesized that these responses depend on the type of running exercise and relate to the physical characteristics. Altogether nine different running exercises and a long walking exercise were performed by a total of 88 male athletes. An intermittent exercise consisting of progressive 20 s runs decreased vertical jump performance in middle distance runners (MID), but improved it in marathon runners (MAR). An 18 – 24 min exhaustive test run, a 40 min i…
Acute respiratory infections hamper training and competition in cross-country skiers, especially in those with asthma
2023
Acute respiratory infections (ARinf) are one of the leading causes that prevent athletes from training and competing. The aim of this study was to investigate the burden of ARinfs during one season among cross-country skiers. All Finnish cross-country skiers enrolled in the largest national competitions in winter 2019 (n = 1282) were sent a postal questionnaire. A higher proportion of skiers with than without asthma had to refrain from competitions because of ARinf (76.9% vs. 62.2%, p = 0.011) but there was no significant difference in refraining from training (91.2% vs. 83.8%, p = 0.084). In skiers with asthma, the median duration of a single ARinf episode was longer (5.0 days, IQR 3.8–6.8…
Gut Microbiota and Serum Metabolome in Elite Cross-Country Skiers : A Controlled Study
2022
Exercise has been shown to affect gut the microbiome and metabolic health, with athletes typically displaying a higher microbial diversity. However, research on the gut microbiota and systemic metabolism in elite athletes remains scarce. In this study, we compared the gut microbiota profiles and serum metabolome of national team cross-country skiers at the end of an exhausting training and competitive season to those of normally physically-active controls. The gut microbiota were analyzed using 16S rRNA amplicon sequencing. Serum metabolites were analyzed using nuclear magnetic resonance. Phylogenetic diversity and the abundance of several mucin-degrading gut microbial taxa, including Akker…
Yhdistetyn kestävyys- ja nopeusvoimaharjoittelun vaikutukset kestävyyssuorituskykyyn sekä voima- ja nopeusominaisuuksiin kestävyysurheilijoilla
2001
Eija Salonen. Yhdistetyn kestävyys- ja nopeusvoimaharjoittelun vaikutukset kestävyyssuorituskykyyn sekä voima- ja nopeusominaisuuksiin kestävyysurheilijoilla. Voima- ja kestävyysharjoittelun yhdistämistä on pidetty ongelmallisena, sillä vaikutusmekanismeiltaan nama harjoitusmenetelmät poikkeavat selvästi toisistaan. Kestävyysurheilijoilla nopeusvoimatyyppisen harjoittelun on todettu kehittävän nopeusvoimaa, kuitenkaan heikentämättä kestävyysominaisuuksia. Hiihdossa ja ampumahiihdossa tarvitaan erittäin hyvää aerobista kapasiteettia sekä kilpailuvauhtien kasvaessa hyvää hermo-lihasjärjestelmän toimintakykyisyyttä. Nopeusvoiman harjoittaminen saattaa jopa parantaa kestävyyssuoritusta, koska l…
Energetic demands and nutritional strategies of elite cross-country skiers during Tour de Ski : A narrative review
2021
The Tour de Ski (TDS: 6–9 sprint and distance races across 9–11 days) represents the most intense competition series of the cross-country (XC) ski season and is characterized by accumulated stress from consecutive days of high-intensity (~ 85%–160% VO2max) racing, travel, cold temperatures and low to moderate altitude (500–1500 m above sea level). Here, nutritional strategies play a key supportive role for optimized health, recovery and performance. This narrative review aims to provide an evidence-based discussion on the energetic demands of the TDS and recommendations for nutritional strategies to optimize health and performance of XC skiers during and following the TDS. We highlight seve…
Erilaisten tehoharjoitusten akuutti vaikutus sykevaihteluun kestävyysurheilijoilla
2004
Sukanen, Piia. 2004. Erilaisten tehoharjoitusten akuutti vaikutus sykevaihteluun kestävyysurheilijoilla. Jyväskylän yliopisto. Liikuntabiologian laitos. Liikuntafysiologian Pro gradu- tutkielma. Fyysisen kuormituksen on järkytettävä elimistön homeostaasia ja aiheutettava lyhyt ylikuormitustila, jotta syntyy urheilijan toivoma harjoitusvaikutus. Kestävyysharjoittelun vaikutukset tunnetaankin melko hyvin, mutta yksittäisen harjoituksen aiheuttamia autonomisen säätelyn muutoksia ei ole juurikaan tutkittu. Näitä muutoksia voidaan selvittää autonomisen hermoston noninvasiivisilla tutkimuksilla, kuten sykevaihtelua mittaamalla. Tämän tutkimuksen tarkoituksena oli selvittää kestävyysurheilijoilla …