Disciplines
Exercise Science
Abstract (300 words maximum)
Non-local performance fatigue (NLPF) can be described as performance decrements occurring for a muscle group that was not directly involved in the fatiguing activity that preceded. Most studies on NLPF involve strenuous exercise of an isolated joint in trained populations, however, little evidence exists on NLPF derived from activities mimicking acts of daily living. Determining whether NLPF exists following brisk walking is worthwhile, and rate of force development (RFD), the rate at which muscle force is produced, may possess increased susceptibility compared to maximal strength. The purpose of our ongoing study is to determine the responses, if any, for maximal strength and RFD of the upper body after brisk walking in young and middle-aged females. Here we report on preliminary findings with no age-related comparisons. Subjects completed handgrip testing before and 3, 7, and 11 minutes after a 6-min brisk walking task. The instructions for the walking task were to “cover as much distance as possible”. Subjects were instructed to squeeze the handgrip dynamometer as “hard and fast as possible”. PT, and peak, early (0-50 ms), and late (0-200 ms) RTD were calculated from the torque-time curve. Friedman’s test and relative changes were computed to examine responses across time. RESULTS: RFD 0-200 was decreased at 3 min post (p = 0.004), whereas all other measures remained unchanged across time. CONCLUSIONS: Late RFD was reduced 3 minutes post, but maximal strength was not, suggesting late RFD may be more sensitive to NLPF than maximal strength. However, it is unclear why only late RFD was reduced. Additional research is needed to characterize the physiological changes which might explain these changes.
Academic department under which the project should be listed
WCHHS - Exercise Science and Sport Management
Primary Investigator (PI) Name
Garrett Hester
Included in
Does a Brisk Six Minute Walk Cause Upper Body Fatigue in Females
Non-local performance fatigue (NLPF) can be described as performance decrements occurring for a muscle group that was not directly involved in the fatiguing activity that preceded. Most studies on NLPF involve strenuous exercise of an isolated joint in trained populations, however, little evidence exists on NLPF derived from activities mimicking acts of daily living. Determining whether NLPF exists following brisk walking is worthwhile, and rate of force development (RFD), the rate at which muscle force is produced, may possess increased susceptibility compared to maximal strength. The purpose of our ongoing study is to determine the responses, if any, for maximal strength and RFD of the upper body after brisk walking in young and middle-aged females. Here we report on preliminary findings with no age-related comparisons. Subjects completed handgrip testing before and 3, 7, and 11 minutes after a 6-min brisk walking task. The instructions for the walking task were to “cover as much distance as possible”. Subjects were instructed to squeeze the handgrip dynamometer as “hard and fast as possible”. PT, and peak, early (0-50 ms), and late (0-200 ms) RTD were calculated from the torque-time curve. Friedman’s test and relative changes were computed to examine responses across time. RESULTS: RFD 0-200 was decreased at 3 min post (p = 0.004), whereas all other measures remained unchanged across time. CONCLUSIONS: Late RFD was reduced 3 minutes post, but maximal strength was not, suggesting late RFD may be more sensitive to NLPF than maximal strength. However, it is unclear why only late RFD was reduced. Additional research is needed to characterize the physiological changes which might explain these changes.