Proficiency in pole handling during Nordic walking influences exercise effectiveness in middle-aged and older adults

• Published in: PloS one Vol. 13; no. 11; p. e0208070
• Main Authors: Fujita, Eiji, Yakushi, Karen, Takeda, Masaki, Islam, Mohammod Monirul, Nakagaichi, Masaki, Taaffe, Dennis Robert, Takeshima, Nobuo
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 27-11-2018; Public Library of Science (PLoS)
• Subjects: Adults; Aged; Aging; Analysis; Athletes; Biology and Life Sciences; Body mass; Covariance; Cross country skiing; Driving ability; Electromyography; Energy expenditure; Engineering and Technology; Exercise; Gait; Gender differences; Health aspects; Health promotion; Health sciences; Heart rate; Life sciences; Load cells; Medicine and Health Sciences; Metabolism; Middle age; Muscle function; Muscles; Older people; Peak load; People and Places; Physical fitness; Physical training; Physiological aspects; Physiology; Population; Research and Analysis Methods; Studies; Teachers; Training; Walking; Women; Japan
• DOI: 10.1371/journal.pone.0208070
• EISSN: 1932-6203

Nordic walking (NW) is a total body version of walking increasingly used as a health-promoting activity by middle-aged and older adults. The present study examined the relationship between force exerted through the pole and physiological response during NW. In this non-randomized exercise trial, 17 participants comprising 8 middle-aged and older recreationally trained Nordic walkers (NWrec: 63.7 ± 8.1 years) and 9 experienced NW instructors (NWinstr: 57.5 ± 7.8 years) underwent outdoor ordinary walking (OW) and NW bouts as fast as possible for 12 minutes. Walking distance, speed, heart rate (HR), energy expenditure (METs and J/kg/m) and upper and lower limb muscle activities using surface electromyogram (EMG) were assessed. A pole with a built-in load cell measured force applied to the pole with peak pole force, pole contact time, % of pole contact time with respect to the gait cycle, and pole impulse derived. We conducted two-way analysis of covariance adjusted for age and BMI. There was a significant group and walking type interaction for walking distance and speed (P = 0.04), METs (P < 0.01), and HR (P = 0.04) with higher values in the NWinstr group during NW than OW. As expected, upper limb EMG activities increased (P < 0.01) with NW in both groups. All pole force measures were significantly higher in NWinstr than NWrec (P ≤ 0.01). Change in walking distance and speed were correlated with pole peak force (r = 0.67, P < 0.01) and pole impulse (r = 0.63, P = 0.01). Similarly, change in METs was associated with peak pole force (r = 0.66, P < 0.01) and pole impulse (r = 0.56, P = 0.02). These results indicate that planting the pole on the ground more forcefully and for longer periods to derive a driving force in NW enhances the effectiveness of the exercise and potentially the health-derived benefits.