M. Corette, S. Sankar, M. Boxwell, C.J. Wutzke

Gonzaga University, Spokane, WA

A dynamic-warm up is important when exercising in reduced temperature climates. However, little is known about the influence of warm-up intensity on factors such as flexibility or torque production in a reduced temperature environment. PURPOSE: To determine the influence of warm-up intensity on range of motion and torque production in a reduced temperature environment. METHODS: Thirteen young, unimpaired adults completed a dynamic warm-up in an environmental chamber at 3.3 ℃ (48° F). Participants performed two conditions at different warm-up intensities (high: 85% heart-rate max or low: 50% heart-rate max), followed by a 60 second run and five consecutive hamstring curl trials. A seven-unit inertial sensor system was placed on the lower extremity of participants to record knee range of motion (ROM) during the 60 second post-warm-up run. A handheld dynamometer was used to record peak muscle torque while performing maximal hamstring curls. Passive knee ROM was collected with a goniometer at three intervals: Prior to the dynamic warm-up, post dynamic warm-up, and following the 60 second run. RESULTS: No difference was found between hamstring curls at the 50% HR max warm-up (188.60±57.72 Nm) and 85% HR max warm-up (203.08±64.66 Nm) conditions (p=0.168). At the 50% HR max warm-up condition, it was found that torque following the warm-up (112.69 ± 1.81 Nm) was lower than torque prior to warm-up (115.85 ± 1.87 Nm, p=0.012). However, at the 85% HR max warm-up, there was no difference in torque (p=0.712). CONCLUSION: Increased intensity during warm-up resulted in greater passive knee ROM. Therefore, a high intensity warm-up may be beneficial for individuals engaged in exercise in reduced temperature conditions.

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