Theses and Dissertations at Montana State University (MSU)

Permanent URI for this communityhttps://scholarworks.montana.edu/handle/1/732

Browse

Subject: search.filters.subject.Athletics--Equipment and supplies

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    The influence of splitboard bindings and touring-specific boots on muscle activity, stride length, and joint kinematics during splitboard touring
    (Montana State University - Bozeman, College of Education, Health & Human Development, 2017) Valentin, Celine McShea; Chairperson, Graduate Committee: John G. Seifert
    Splitboarding is a form of alpine recreation that involves using a snowboard that splits into two skis to tour in backcountry terrain. At the summit, the skis are attached together and used as a normal snowboard to ride downhill. As splitboarding has grown in popularity, manufacturers have developed splitboard-specific equipment, such as bindings and boots. This crossover study investigated the effects of highback lean settings on Spark R&D splitboard bindings and two Burton Snowboards boot models while touring uphill. Subjects toured on a treadmill at a 10% incline in four test conditions: the Driver X boot with positive lean, the Driver X boot with negative lean, the Tourist boot with positive lean, and the Tourist boot with negative lean. Lower limb muscle activity was recorded as average root-mean-square (RMS) for gluteus medius (GM), biceps femoris (BF), rectus femoris (RF), medial gastrocnemius (MG), and tibialis anterior (TA). Kinematics variables of stride length, and ankle and knee range of motion (ROM) were also measured. The effects of the boots and bindings were determined using a two-way repeated measures analysis of variance (alpha < 0.05). The main effect of binding on average RMS was not significant for all muscles except MG (F = 8.821, p = 0.018, f = 1.05), with the negative lean having higher average RMS than the positive lean. The main effect of boot on stride length was significant (F = 15.791, p = 0.003, f = 1.33), with the Tourist resulting in a 3.56 cm longer stride length that the Driver X. The main effect of binding on stride length was also significant (F = 9.875, p = 0.012, f = 1.05), with negative lean resulting in a 2.21 cm longer stride length than the positive lean. The main effect of boot model on ankle ROM was significant (F = 36.325, p = 0.000, f = 2.00), with the Tourist having a larger ROM than the Driver X. There were no significant effects or interactions for knee ROM. The results of this study demonstrate that boot model and binding settings can affect biomechanical and physiological variables while splitboard touring.
  • Thumbnail Image
    Item
    The effect of lower limb loading on economy and kinematics of skate roller skiing
    (Montana State University - Bozeman, College of Education, Health & Human Development, 2014) Reinking, Tyler Johnson; Chairperson, Graduate Committee: Daniel P. Heil; Daniel P. Heil was a co-author of the article, 'The effect of lower limb loading on economy and kinematics of skate roller skiing' submitted to the journal 'European journal of applied physiology' which is contained within this thesis.
    It has been proposed that skate skiing economy and racing performance have improved as a result of lighter equipment. Despite the many studies that have found running and walking economy to improve with lighter shoes, there are no published studies that show any relationship between the mass of skate skiing equipment and markers of skate skiing performance. To investigate the effects of skate skiing equipment mass on markers of performance, this study added mass to the lower limbs of skate roller skiers and measured changes in economy and gross movement kinematics. Twelve male (Mean±SD; Age (yrs): 21.4±3.9) and eight female (Mean±SD; Age (yrs): 19.9±2.2) competitive cross-country skiers completed two laboratory visits to roller ski on an oversized treadmill. In the first visit, subjects completed a graded exercise test to determine their lactate threshold. In the second visit, subjects completed 5 minutes of roller skiing at a low work rate (2 m/s for women and 3 m/s for men both at 2°) and a high work rate (2 m/s for women and 3 m/s for men both at 3.15°) for each of the four limb loading conditions (0 g, 200 g, 400 g, and 600 g). Oxygen consumption (VO2), heart rate (HR), and cycle rate were measured during the last 2 minutes of each stage and used for analysis. There were no significant differences in HR, VO2, or cycle rate between any of the limb loading conditions at either work rate. However, cycle rate neared significance (P = 0.06), with increases in cycle rate observed during greater limb loading. Interestingly, VO2 and HR significantly increased throughout testing, independent of limb loading condition. The most notable increases were observed in HR values, and increases began within the very first testing stage. Thus, it is likely that the subjects experienced cardiovascular drift due to mild hyperthermia. The effects of hyperthermia might have masked the true effects of lower limb loading. Therefore, future studies still need to investigate the effects of lower limb loading on skate skiing economy and kinematics
Copyright (c) 2002-2022, LYRASIS. All rights reserved.