Purpose: There have been many studies on the effects of different types of backpacks on posture from a biomechanical perspective and on the center of gravity. Considering the effects of autonomic nervous system activity and mood associated with backpacks in mountaineering and hiking, research is also needed from a psychological perspective. In this study, the effects of adjusting the backpack shoulder stabilizer were preliminarily tested in terms of subjective fatigue and changes in autonomic nervous activity after hiking. Methods: The experimental 15 healthy participants hiked the mountain under two conditions: 1) without adjusting the stabilizer, a feature of the backpack (NAH condition), and 2) with the stabilizer adjusted (AH condition). First, all participants hiked the mountain in the NAH condition, and after a 30-minute break, they began the hike in the AH condition after confirming that a) their heart rate had recovered and b) they were in good physical condition. Results: HR was significantly lower after each hiking session than during the session. RMSSD was significantly lower pre-AH and post-AH than the NAH condition, but there was no significant difference between the NAH condition and either post-NAH or post-AH. Additionally, RMSSD was significantly lower in the AH condition than pre-AH or post-AH. The shoulders and back were significantly more burdened in the NAH condition than in the AH condition. The pleasure level was significantly higher in the AH condition than in the NAH condition. Conclusion: The results showed that also adjusting the position of the waist belt when adjusting the shoulder stabilizer, which is mainly used for the neck and shoulders, has a significant positive effect on the subjective burden on the upper body and parasympathetic nervous system activity after hiking.
References
[1]
Police Administration Department (2023) Overview of Mountain Disasters in 2023. http://sounanzyouhou.web.fc2.com/file/file/98.pdf
[2]
Japan Sports Agency (2020) Prevention of Accidents in Summer Mountain Climbing. https://www.mext.go.jp/sports/b_menu/hakusho/nc/1419028.htm
[3]
Dotti, F., Bianca, E., Matteo, G. and Ferri, A. (2024) Ergonomic Comfort of Trekking Backpacks: Measurements of Pressure Exerted by Shoulder Straps and Hip Belt in Female Users. In: Carfagni, M., Furferi, R., Di Stefano, P., Governi, L. and Gherardini, F., Eds., Design Tools and Methods in Industrial Engineering III, Springer Nature Switzerland, 135-143. https://doi.org/10.1007/978-3-031-58094-9_16
[4]
Gregory Mountain Products. Backpack Fit & Sizing: The Do’s and Don’ts and How to Get It Right. https://www.gregorypacks.co.za/pack-fit-care/fit-sizing/?srsltid=AfmBOop6_x-I5bt2_szZi7Nw5fKKC7tZVuVI11aXbpDvl7TmRDedmYzC
[5]
Hansen, H. (2024) How to Properly Fit a Backpack. https://www.hellyhansen.com/guides/how-to-fit-your-backpack?srsltid=AfmBOopxMBnrN-JUYBm29PJD5Hu6cRX7hn3PDmSDSdf6YhAnx-uKrqw5&no_preserver=true
[6]
Trail & Crag: How to Size and Fit a Backpack. https://trailandcrag.com/hiking-running/how-to-size-fit-backpack
[7]
Genitrini, M., Dotti, F., Bianca, E. and Ferri, A. (2022) Impact of Backpacks on Ergonomics: Biomechanical and Physiological Effects: A Narrative Review. International Journal of Environmental Research and Public Health, 19, Article 6737. https://doi.org/10.3390/ijerph19116737
[8]
Holt, K.G., Wagenaar, R.C., LaFiandra, M.E., Kubo, M. and Obusek, J.P. (2003) Increased Musculoskeletal Stiffness during Load Carriage at Increasing Walking Speeds Maintains Constant Vertical Excursion of the Body Center of Mass. Journal of Biomechanics, 36, 465-471. https://doi.org/10.1016/s0021-9290(02)00457-8
[9]
Kim, K., Ann, J. and Jang, S. (2019) Analysis of the Effect of Backpack Design with Reduced Load Moment Arm on Spinal Alignment. International Journal of Environmental Research and Public Health, 16, Article 4351. https://doi.org/10.3390/ijerph16224351
[10]
Pyatigorskaya, N., Mongin, M., Valabregue, R., Yahia-Cherif, L., Ewenczyk, C., Poupon, C., et al. (2016) Medulla Oblongata Damage and Cardiac Autonomic Dysfunction in Parkinson Disease. Neurology, 87, 2540-2545. https://doi.org/10.1212/wnl.0000000000003426
[11]
Hallman, D.M. and Lyskov, E. (2012) Autonomic Regulation, Physical Activity and Perceived Stress in Subjects with Musculoskeletal Pain: 24-Hour Ambulatory Monitoring. International Journal of Psychophysiology, 86, 276-282. https://doi.org/10.1016/j.ijpsycho.2012.09.017
[12]
Niedermeier, M., Grafetstätter, C., Hartl, A. and Kopp, M. (2017) A Randomized Crossover Trial on Acute Stress-Related Physiological Responses to Mountain Hiking. International Journal of Environmental Research and Public Health, 14, Article 905. https://doi.org/10.3390/ijerph14080905
[13]
de Brito, J.N., Pope, Z.C., Mitchell, N.R., Schneider, I.E., Larson, J.M., Horton, T.H., et al. (2020) The Effect of Green Walking on Heart Rate Variability: A Pilot Crossover Study. Environmental Research, 185, Article ID: 109408. https://doi.org/10.1016/j.envres.2020.109408
[14]
Janakiraman, B., Ravichandran, H., Demeke, S. and Fasika, S. (2017) Reported Influences of Backpack Loads on Postural Deviation among School Children: A Systematic Review. Journal of Education and Health Promotion, 6, 41. https://doi.org/10.4103/jehp.jehp_26_15
[15]
Valérie Lavigne, D.C. (2014) Weight Limit Recommendation in Backpack Use for School-Aged Children. Journal of Clinical Chiropractic Pediatrics, 14, 1156-1159.
[16]
Altini, M. and Amft, O. (2016) HRV4Training: Large-Scale Longitudinal Training Load Analysis in Unconstrained Free-Living Settings Using a Smartphone Application. 2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Orlando, 16-20 August 2016, 2610-2613. https://doi.org/10.1109/embc.2016.7591265
[17]
Yoghourdjian, V., Yang, Y., Dwyer, T., Lawrence, L., Wybrow, M. and Marriott, K. (2021) Scalability of Network Visualisation from a Cognitive Load Perspective. IEEE Transactions on Visualization and Computer Graphics, 27, 1677-1687. https://doi.org/10.1109/tvcg.2020.3030459
[18]
Halson, S.L. (2014) Monitoring Training Load to Understand Fatigue in Athletes. Sports Medicine, 44, 139-147. https://doi.org/10.1007/s40279-014-0253-z
[19]
Saboul, D., Pialoux, V. and Hautier, C. (2013) The Impact of Breathing on HRV Measurements: Implications for the Longitudinal Follow-Up of Athletes. European Journal of Sport Science, 13, 534-542. https://doi.org/10.1080/17461391.2013.767947
[20]
Onodera, K. and Miyashita, M. (1976) A Study on Japanese Scale for Rating of Perceived Exertion in Endurance Exercise. Taiikugakukenkyu (Japan Journal of Physical Education, Health and Sport Sciences), 21, 191-203. https://doi.org/10.5432/jjpehss.kj00003405473
[21]
Sakairi, Y., Tokuda, E., Kawahara, M., Yagi, T. and Soya, H. (2003) Development of the Two-Dimension Mood Scale for Measuring Psychological Arousal Level and Hedonic Tone. Bulletin of Institute of Health and Sport Science, the University of Tsukuba, 26, 27-36.
[22]
Sakairi, Y., Nakatsuka, K. and Shimizu, T. (2013) Development of the Two-Dimensional Mood Scale for Self-Monitoring and Self-Regulation of Momentary Mood States. Japanese Psychological Research, 55, 338-349. https://doi.org/10.1111/jpr.12021
[23]
Leon, A.S., Franklin, B.A., Costa, F., Balady, G.J., Berra, K.A., Stewart, K.J., et al. (2005) Cardiac Rehabilitation and Secondary Prevention of Coronary Heart Disease. Circulation, 111, 369-376. https://doi.org/10.1161/01.cir.0000151788.08740.5c
[24]
Sandercock, G.R.H., Bromley, P.D. and Brodie, D.A. (2005) Effects of Exercise on Heart Rate Variability: Inferences from Meta-Analysis. Medicine & Science in Sports & Exercise, 37, 433-439. https://doi.org/10.1249/01.mss.0000155388.39002.9d
[25]
Goldberger, J.J., Le, F.K., Lahiri, M., Kannankeril, P.J., Ng, J. and Kadish, A.H. (2006) Assessment of Parasympathetic Reactivation after Exercise. American Journal of Physiology-Heart and Circulatory Physiology, 290, H2446-H2452. https://doi.org/10.1152/ajpheart.01118.2005
[26]
Gockel, M., Lindholm, H., Alaranta, H., Viljanen, A., Lindquist, A. and Lindholm, T. (1995) Cardiovascular Functional Disorder and Stress among Patients Having Neck-Shoulder Symptoms. Annals of the Rheumatic Diseases, 54, 494-497. https://doi.org/10.1136/ard.54.6.494
[27]
Matsui, T. and Fujimoto, T. (2011) Treatment for Depression with Chronic Neck Pain Completely Cured in 94.2% of Patients Following Neck Muscle Treatment. Neuroscience and Medicine, 2, 71-77. https://doi.org/10.4236/nm.2011.22011
[28]
Schoenen, J., Jamart, B., Gerard, P., Lenarduzzi, P. and Delwaide, P.J. (1987) Exteroceptive Suppression of Temporalis Muscle Activity in Chronic Headache. Neurology, 37, 1834-1834. https://doi.org/10.1212/wnl.37.12.1834
[29]
Chen, Y., Liu, M., Zhou, J., Bao, D., Li, B. and Zhou, J. (2023) Acute Effects of Fatigue on Cardiac Autonomic Nervous Activity. Journal of Sports Science and Medicine, 22, 806-815. https://doi.org/10.52082/jssm.2023.806
