Polar h10 hr sensor

HR was measured during baseline, the FSDD and 10-minute recovery using the Polar H10 HR sensor (Polar Electro Ltd, Kempele, Finland) and during baseline, the FSDD and 30-minute recovery using Bodyguard 2 (Firstbeat Technologies Ltd, Jyväskylä, Finland), which was attached to the participant's chest by two single-use ECG electrodes (BlueSensor VL-00-S, Ambu A/S, Ballerup, Denmark). Polar H10 was connected via Bluetooth to the Metasoft Studio software. The Polar H10 and Bodyguard 2 were attached to the participant's chest before the baseline measurement. HR was measured by Polar H10 continuously for the last five minutes of the baseline measurement, the FSDD and initial 10 minutes of the recovery period, and by Bodyguard 2 from the beginning of the 10-minute baseline measurement until the end of the 30-minute recovery using. HR was measured with two devices, because the Polar H10 could be connected to the Metasoft Studio software and measured online during the drill. The Bodyguard 2 measurement was done to register HR throughout the whole recovery period.

In the two test sessions, participants performed the running and jumping protocol. HR was monitored using a Polar H10 HR sensor (Polar, Kempele, Finland). After each running and jumping bout, participants were asked to provide RPE-B and RPE-L using the same procedures as in the familiarisation session. The two test sessions differed from each other through the running and jumping style involving high or low impacts on the lower extremity. One of the sessions consisted of relative higher body impacts by instructing participants to run in a heel strike pattern and to perform jumps with a passive landing by keeping their legs in extension. In the other session, participants were instructed to run in a forefoot strike pattern and to perform jumps with an active "softer" landing by performing an eccentric squat movement during landing. We highlight that we only manipulated the movement patterns to elicit different impacts, and possibly separate responses in terms of RPE-B and RPE-L. We do not focus on the relationship between these movement patterns and the overall training load or performance and health benefits. To identify the alteration in impacts between both sessions, ground reaction forces (GRF) were recorded by force sensors built into the instrumental treadmill (Motek Medical, The Netherlands) on which both running and jumping activities took place. 21