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Article

Do Surface Slope and Posture Influence Lower Extremity Joint Kinetics during Cycling?

by 1,2,†, 1,3,†, 1,4, 1, 1,5, 1,6 and 1,*
1
Key Laboratory of Exercise and Health Sciences of the Ministry of Education, Shanghai University of Sport, Shanghai 200438, China
2
College of Art & Design, Shaanxi University of Science & Technology, Xi’an 710021, China
3
Shanghai R&D Center, Lifesense Medical Electronics Co., Ltd., Shanghai 200051, China
4
Department of Physical education, Liaocheng University, Liaocheng 252059, China
5
Sport biomechanics lab, Shandong Institute of Sports Science, Jinan 250102, China
6
Department of Physical education, Jinggangshan University, Ji’an 343009, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work and should be considered co-first authors.
Int. J. Environ. Res. Public Health 2020, 17(8), 2846; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17082846
Received: 4 March 2020 / Revised: 17 April 2020 / Accepted: 18 April 2020 / Published: 21 April 2020
(This article belongs to the Special Issue Sports and Health)
The purpose of this study was to investigate the effects of surface slope and body posture (i.e., seated and standing) on lower extremity joint kinetics during cycling. Fourteen participants cycled at 250 watts power in three cycling conditions: level seated, uphill seated and uphill standing at a 14% slope. A motion analysis system and custom instrumented pedal were used to collect the data of fifteen consecutive cycles of kinematics and pedal reaction force. One crank cycle was equally divided into four phases (90° for each phase). A two-factor repeated measures MANOVA was used to examine the effects of the slope and posture on the selected variables. Results showed that both slope and posture influenced joint moments and mechanical work in the hip, knee and ankle joints (p < 0.05). Specifically, the relative contribution of the knee joint to the total mechanical work increased when the body posture changed from a seated position to a standing position. In conclusion, both surface slope and body posture significantly influenced the lower extremity joint kinetics during cycling. Besides the hip joint, the knee joint also played the role as the power source during uphill standing cycling in the early downstroke phase. Therefore, adopting a standing posture for more power output during uphill cycling is recommended, but not for long periods, in view of the risk of knee injury. View Full-Text
Keywords: cycling; lower extremity; joint kinetics; surface slope; posture; joint function cycling; lower extremity; joint kinetics; surface slope; posture; joint function
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MDPI and ACS Style

Tang, Y.; Wang, D.; Wang, Y.; Yin, K.; Zhang, C.; Zou, L.; Liu, Y. Do Surface Slope and Posture Influence Lower Extremity Joint Kinetics during Cycling? Int. J. Environ. Res. Public Health 2020, 17, 2846. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17082846

AMA Style

Tang Y, Wang D, Wang Y, Yin K, Zhang C, Zou L, Liu Y. Do Surface Slope and Posture Influence Lower Extremity Joint Kinetics during Cycling? International Journal of Environmental Research and Public Health. 2020; 17(8):2846. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17082846

Chicago/Turabian Style

Tang, Yunqi, Donghai Wang, Yong Wang, Keyi Yin, Cui Zhang, Limin Zou, and Yu Liu. 2020. "Do Surface Slope and Posture Influence Lower Extremity Joint Kinetics during Cycling?" International Journal of Environmental Research and Public Health 17, no. 8: 2846. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17082846

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