The Effect of Landing Surface on the Plantar Kinetics of Chinese Paratroopers Using Half-Squat Landing

Yi Li, Ji Wu, Chao Zheng, Rong Rong Huang, Yuhong Na, Fan Yang, Zengshun Wang, Di Wu


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Ios-APP Journal of Sports Science and Medicine

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©Journal of Sports Science and Medicine (2013) 12, 409 - 413

Research article

The Effect of Landing Surface on the Plantar Kinetics of Chinese Paratroopers Using Half-Squat Landing

Yi Li¹, Ji Wu^,1

, Chao Zheng¹, Rong Rong Huang¹, Yuhong Na², Fan Yang³, Zengshun Wang¹, Di Wu¹

Publish Date

Received: 17-01-2013
Accepted: 04-04-2013
Published (online): 01-09-2013

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ABSTRACT

The objective of the study was to determine the effect of landing surface on plantar kinetics during a half-squat landing. Twenty male elite paratroopers with formal parachute landing training and over 2 years of parachute jumping experience were recruited. The subjects wore parachuting boots in which pressure sensing insoles were placed. Each subject was instructed to jump off a platform with a height of 60 cm, and land on either a hard or soft surface in a half-squat posture. Outcome measures were maximal plantar pressure, time to maximal plantar pressure (T-MPP), and pressure-time integral (PTI) upon landing on 10 plantar regions. Compared to a soft surface, hard surface produced higher maximal plantar pressure in the 1^st to 4^th metatarsal and mid-foot regions, but lower maximal plantar pressure in the 5^th metatarsal region. Shorter T- MPP was found during hard surface landing in the 1^st and 2^nd metatarsal and medial rear foot. Landing on a hard surface landing resulted in a lower PTI than a soft surface in the 1^stphalangeal region. For Chinese paratroopers, specific foot prosthesis should be designed to protect the1^st to 4^thmetatarsal region for hard surface landing, and the 1^stphalangeal and 5^thmetatarsal region for soft surface landing.

Key words: Half-squat landing, plantar kinetics, plantar pressure, surface reaction force, pressure time integral

Key Points

Understanding plantar kinetics during the half-squat landing used by Chinese paratroopers can assist in the design of protective footwear.

Compared to landing on a soft surface, a hard surface produced higher maximal plantar pressure in the 1 to 4 metatarsal and mid-foot regions, but lower maximal plantar pressure in the 5 metatarsal region.

A shorter time to maximal plantar pressure was found during a hard surface landing in the 1 and 2 metatarsals and medial rear foot.

Landing on a hard surface resulted in a lower pressure-time integral than landing on a soft surface in the 1 phalangeal region.

For Chinese paratroopers, specific foot prosthesis should be designed to protect the 1 to 4 metatarsal region for a hard surface landing, and the 1 phalangeal and 5 metatarsal region for a soft surface landing.

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